FamilySync

One shared calendar that keeps co-parents aligned.

FamilySync is a mobile-first shared calendar for co-parents who need one reliable view of custody, school events, activities, and pickups. It helps both parents see changes instantly, confirm they received updates, and avoid the late-day scheduling surprises that create conflict.

Business Goals

  • Reach 35% primary-parent trial-to-invite conversion within 30 days of launch.
  • Achieve 20% household trial-to-paid conversion within 14 days after trial end by Month 6.
  • Maintain at least 30% annual renewal among paid households by Month 12.
  • Generate 500 qualified waitlist signups and 20 validation interviews before committing to full build.
  • Keep customer acquisition cost below $60 per activated household by Month 6.

User Goals

  • Let one parent create a shared calendar in under 3 minutes.
  • Help both parents see a full week of custody, school, and activity commitments at a glance.
  • Surface double-bookings and custody gaps before pickup time.
  • Provide clear seen status so parents know schedule changes were received.
  • Make it easy to update plans from a phone while on the go.

Non-Goals

  • Court-admissible legal records or certified evidence packages.
  • In-app messaging or chat as a replacement for text.
  • Expense tracking, reimbursements, or shared payments.
  • Support for more than two co-parents in v1.

Sarah, Primary Parent on a 2-2-3 schedule - Sarah manages most of the coordination across school, activities, and two households. She needs a simple way to keep her ex informed without repeated texting and wants to catch conflicts before the day gets busy.

Sarah, Primary Parent on a 2-2-3 schedule

  • As a primary parent, I want to create a shared custody calendar quickly, so that I can stop reconciling text threads and paper notes.
  • As a parent adding an activity, I want the app to show conflicts immediately, so that I can avoid double-booking pickup or practice.
  • As a parent, I want confirmation that my co-parent saw an update, so that I do not have to follow up manually.

Marcus, Co-parent who checks sporadically - Marcus wants to stay engaged but often misses updates buried in messages. He needs push notifications and a simple view that tells him what changed and what he is responsible for.

Marcus, Co-parent who checks sporadically

  • As a co-parent, I want push alerts for schedule changes, so that I do not miss a pickup or activity.
  • As a parent, I want to tap once to confirm I saw an update, so that my ex knows the message landed.
  • As a parent, I want to view my custody days and upcoming events in one place, so that I can prepare without asking for reminders.

Jamie, Family law mediator - Jamie advises parents on lowering conflict and keeping communication clear. She needs a tool that is simple enough that clients actually use it and produces defensible activity history if disputes arise.

Jamie, Family law mediator

  • As an advisor, I want to recommend a low-friction calendar tool, so that clients communicate through a shared system instead of text.
  • As an advisor, I want parents to have time-stamped activity history, so that there is a clear record of changes and acknowledgements.
  • As an advisor, I want the product to feel calm and collaborative, so that clients do not abandon it after a week.

Unified Shared Calendar · High priority

  • Provide a single calendar view that merges custody days, appointments, school events, and activities for both parents.
  • Display day, week, and agenda views optimized for mobile screens.
  • Color-code entries by parent and by event type.
  • Flag overlaps, missing handoff coverage, and duplicate events inline.
  • Support custody blocks as first-class calendar items.
  • Allow events to be edited by either parent with immediate sync.

Two-Parent Invite and Acknowledgement · High priority

  • Enable a primary parent to invite the co-parent and confirm that updates were received.
  • Support invite via email or phone number with a single-use link.
  • Require the invited parent to join with minimal account creation friction.
  • Send push notifications for every new event and change.
  • Show seen and confirmed status for updates and invites.
  • Expire invite links after 72 hours and allow re-send from the app.

Fast Event Entry · High priority

  • Make it easy to create and edit events from a phone in a few taps or less.
  • Allow plain-language entry such as soccer Tuesday 4pm.
  • Support recurring weekly activities and repeating custody patterns.
  • Let users assign each event to a parent, child, or household.
  • Validate date, time, and overlap rules before saving.
  • Provide undo for recent changes and edit history access.

Privacy and Account Safety · High priority

  • Protect family data with privacy-first defaults and strong access controls.
  • Collect only essential profile and scheduling data.
  • Encrypt sensitive data at rest and in transit.
  • Provide family-level access revocation from within the app.
  • Avoid ads, third-party trackers, and behavioral profiling.
  • Support MFA for account security and device re-authentication.

Export and History · Medium priority

  • Keep a defensible record of changes and support personal record keeping.
  • Log every create, edit, acknowledgement, and deletion attempt with a timestamp.
  • Provide PDF and iCal export for household records.
  • Keep history append-only for event audits.
  • Include a checksum on exported files.
  • Surface a change timeline for each event.

First-Time Setup Flow

  • Install the app and choose Create Family Calendar.
  • Enter name, email or phone, and select a custody template.
  • Add child names, school, and the first recurring activities.
  • Send invite to the co-parent by SMS or email.
  • Receive the first shared view within 3 minutes of signup.
  • See the next seven days, with obvious conflicts and pending invites highlighted.

1. Create the family calendar

  • The primary parent starts a household and chooses a custody template that pre-fills the baseline schedule.
  • Show 2-2-3, alternating weeks, 5-2-2-5, and every-other-weekend options.
  • If no template fits, allow a custom repeating pattern.
  • Pre-populate the calendar so value is visible immediately.

2. Invite the co-parent

  • The primary parent sends a single-use invite link by SMS or email so the other parent can join quickly.
  • Auto-detect invite delivery status and show pending or accepted.
  • If the link expires, allow one-tap resend.
  • Warn if the co-parent has not joined after 24 hours.

3. Add and update events

  • Both parents can add school, activity, pickup, and appointment items from mobile.
  • Support natural-language input and structured entry.
  • Run conflict detection before save and show the exact overlap.
  • Allow edits to propagate instantly to both devices.

4. Confirm changes

  • Every change is acknowledged so both parents know the update was seen.
  • Display seen badges on relevant updates.
  • Push remind the other parent if a critical schedule change is unacknowledged after a set period.
  • Show confirmation history in the event detail view.

5. Review the week

  • Users open a weekly summary that highlights conflicts, handoffs, and upcoming responsibilities.
  • Summarize the next seven days at a glance.
  • Emphasize pickup changes, gaps, and duplicate bookings.
  • If an event is unclear or missing a parent assignment, prompt for completion before leaving the screen.

Advanced Controls and Edge Cases

  • Custom recurring custody schedules for irregular handoff patterns.
  • Time-zone-safe scheduling for travel or temporary relocation.
  • Vacation overrides that temporarily supersede a standard custody template.
  • Event-level permissions for school, childcare, and activities.
  • Exportable change history for personal records.
  • Graceful handling when one parent loses network connectivity and edits are queued locally.

Mobile-First Calm UI

  • Use large tap targets and one-handed navigation.
  • Keep the weekly schedule readable in under 5 seconds on a 4G connection.
  • Show conflicts in high-contrast, non-alarmist visuals.
  • Design for accessibility with screen reader labels, color-blind-safe palettes, and dynamic type support.
  • Prefer short, direct language that reduces emotional friction.
  • Make loading states feel instant with skeleton views and optimistic updates.

Sarah spends Sunday night juggling texts, school notices, and two calendars. A soccer practice changes, then a pickup shifts, and she realizes too late that the week now has a conflict nobody saw until the afternoon before handoff.

With FamilySync, she creates the household calendar, picks a 2-2-3 template, and invites Marcus. When she adds the soccer change, both parents get an immediate push alert and a seen confirmation appears after Marcus opens it. The weekly view highlights the pickup overlap before it becomes a problem, which reduces back-and-forth and keeps both households aligned.

Over time, Sarah stops carrying the coordination alone and Marcus stops feeling out of the loop. The product becomes the shared system both parents trust, lowering conflict, improving reliability, and creating a clear path to subscription retention because the app prevents the problem instead of just documenting it.

User-Centric Metrics

  • 70% of invited co-parents complete onboarding and add at least one event within 7 days.
  • 60% of active households open the weekly conflict summary at least once per week by Day 30.
  • 50% of households create a calendar and select a custody template in under 3 minutes.
  • At least 80% of critical schedule changes receive a seen confirmation within 24 hours.
  • Keep median time from event creation to sync on the other parent’s device under 10 seconds.

Business Metrics

  • 25% Day-30 retention among households where both parents are active.
  • 20% free-trial to paid conversion within 14 days of trial end by Month 6.
  • 30% annual renewal among first paid cohorts by Month 12.
  • 500 validated waitlist signups before launch.
  • At least 20 pricing-validation interviews completed before build commitment.

Technical Metrics

  • 99.5% monthly uptime for calendar read/write operations.
  • Median calendar load time under 2 seconds on a 4G connection.
  • Push notification delivery to both parents within 30 seconds at the 95th percentile.
  • 100% of event changes recorded with immutable timestamps and audit entries.

Tracking Plan

  • family_created
  • custody_template_selected
  • co_parent_invited
  • invite_accepted
  • event_created
  • conflict_detected
  • update_seen
  • weekly_summary_viewed
  • trial_started
  • subscription_converted

Technical Needs

  • Mobile app built in React Native or Flutter for iOS and Android parity.
  • Backend API using Node.js or TypeScript with a PostgreSQL primary datastore.
  • Real-time sync via WebSockets or server-sent events for live calendar updates.
  • Push notification service using APNs and FCM.
  • Background job queue for reminder delivery and conflict checks.
  • Audit log storage with append-only event records.
  • Feature-flag system for phased rollout and onboarding experiments.

Integration Points

  • Apple Push Notification service
  • Firebase Cloud Messaging
  • Stripe for subscription billing
  • Twilio or SendGrid for invite delivery
  • PostHog for product analytics with privacy-safe configuration

Data Storage & Privacy

  • Store only the minimum necessary family and child-related data.
  • Encrypt sensitive fields at rest and use TLS 1.3 in transit.
  • Implement account deletion with a 30-day retention window for soft-deleted data.
  • Do not collect behavioral advertising identifiers or ad SDK data.
  • Support GDPR and CCPA deletion, export, and access requests through self-service flows.

Scalability & Performance

  • Use indexed queries for week-view calendar retrieval and participant filtering.
  • Cache the next seven days of household data to speed mobile load times.
  • Design notification fan-out so one event update can reach both parents reliably.
  • Partition data by household to keep sync and conflict checks efficient as usage grows.

Potential Challenges

  • A resistant co-parent may ignore invites; mitigate with SMS delivery, reminder nudges, and a minimal join flow.
  • Users may compare the product to free calendar tools; mitigate by emphasizing custody templates, seen receipts, and conflict surfacing.
  • Notification delivery may be delayed on mobile networks; mitigate with retry logic and in-app sync on app open.
  • Privacy concerns around children’s data may slow adoption; mitigate with data minimization, clear permissions, and a plain-language privacy policy.
  • Two-sided retention can collapse if one parent disengages; mitigate with activation tracking, reminder emails, and a visible pending-invite state.

Team & resourcing - Small team: 2 mobile/full-stack engineers, 1 product designer, part-time PM, and shared QA/support.

Phase 1: Validation and Prototype · Weeks 1–3

  • 20 customer interviews with divorced or co-parenting parents
  • Clickable onboarding prototype
  • Pricing test for annual household subscription
  • Validated MVP scope and risk list

Phase 2: MVP Calendar and Invite · Weeks 4–10

  • Household creation flow
  • 2-parent invite acceptance
  • Weekly calendar view
  • Manual event add/edit/delete
  • Push notifications and seen confirmations
  • Basic audit trail and export

Phase 3: Conflict Detection and Templates · Weeks 11–16

  • Custody templates for 2-2-3, alternating weeks, 5-2-2-5, and every-other-weekend
  • Automatic overlap and gap detection
  • Weekly conflict summary screen
  • Recurring event support
  • Improved empty states and reminder nudges

Phase 4: Billing and Launch Hardening · Weeks 17–20

  • Stripe subscription setup
  • Trial-to-paid conversion flow
  • Analytics dashboard for activation and retention
  • Privacy and security review checklist
  • App Store and Google Play release readiness

Paste this into Cursor, Bolt, Lovable, or v0 to start building.

Build a mobile-first shared calendar app for co-parents called FamilySync.

Product goal: help two parents share one reliable weekly view of custody days, school events, activities, pickups, and appointments, with instant sync, push notifications, and seen confirmations so conflicts are caught early.

Tech stack:
React Native for iOS and Android, TypeScript, Expo or bare RN if needed, Node.js backend, PostgreSQL, Redis, and a clean component library such as React Native Paper or NativeBase. Use APNs and FCM for push notifications. Use Stripe for billing, Twilio or SendGrid for invites, and PostHog for privacy-safe analytics.

Core screens and flows:
1. Sign up and create household
2. Choose custody template or custom schedule
3. Invite co-parent by email or phone number with single-use link
4. Weekly calendar view with color-coded events and conflict highlights
5. Event create/edit screen with natural-language quick add like soccer Tuesday 4pm
6. Event detail screen with seen status and time-stamped history
7. Settings for notifications, privacy, export, and account deletion
8. Trial and subscription screen for annual household billing

Data model:
User, Household, HouseholdMember, Invite, Child, CustodyTemplate, ScheduleBlock, Event, EventParticipant, EventChangeLog, NotificationDelivery, SeenReceipt, Subscription, ExportJob.

Functional requirements:
Calendar must load in under 2 seconds on mobile, support two parents only in v1, show custody transitions and overlaps, allow recurring events, send push notifications on changes, and record immutable audit history. Event changes should sync in real time to both users. Make the UI calm, accessible, and one-handed.

Important rules:
Privacy-first, no ads, no behavioral tracking, encrypted sensitive data, MFA for accounts, single-use invite links that expire in 72 hours, and append-only change history. Keep the app mobile-only and focused on co-parent scheduling.

Implement the full MVP with realistic mock data, polished empty states, and production-ready architecture, including authentication, state management, backend APIs, and database schema. Make the UI visually simple and trustworthy, optimized for stressed parents on their phone.

Business Idea

PRD Shared Calendar for Co-Parents 1. Overview Co-parents discover scheduling conflicts at the worst possible moment. School pickups, soccer practice, and dinner plans live in separate texts, mental notes, and apps the other parent never sees. FamilySync gives both parents one shared view of the full week so conflicts surface in the morning, not at pickup time. The U.S. has roughly 13 million custodial parents and approximately 400,000 new co-parenting households form each year from divorces involving children (Clio, 2026; BGSU NCFMR, 2024). AppClose and TalkingParents both ended free tiers in early 2026, displacing users who now need an alternative. Market demand is unvalidated: no customer interviews, no waitlist, no prototype feedback exist yet. The immediate next step before building is talking to divorced parents to confirm they would pay for this over what they already use. Working parents mid-divorce managing a 2-2-3 custody schedule across two households Q1 2027 SEGMENT MARKET RELEASE We use cookies for analytics and product improvement, including session recording via PostHog. Declining keeps the site fully functional with only strictly necessary cookies. See our Privacy Policy for details. Decline Accept Design by The Resonance | Powered by GPC – The AI Transformation Company 2. Goals Two-sided activation 70% of households that create a calendar successfully invite and activate the co-parent within 7 days of signup. Measures whether the core two-sided adoption problem is solved at onboarding. Conflict detection engagement 60% of active households view the weekly conflict-detection summary at least once per week by Day 30. Proxy for whether the core value proposition — catching conflicts before 5pm — is actually used. Day-30 household retention Reach 25% Day-30 retention for households where both parents are active. Consumer app average is approximately 6% (Business of Apps, 2026); the two-household dependency creates structural retention pressure that must be measured explicitly. Annual subscription conversion Achieve 15% conversion from free trial to paid annual plan within 14 days of trial end. Apps with low-cost annual plans retain up to 36% of users after year one versus 6.7% for high-priced monthly plans (RevenueCat, 2025), making annual pricing the target structure. Pricing validation Validate willingness to pay at $100 per household per year through 20 qualitative interviews and one pricing survey before development begins. The 3% penetration assumption underlying the $12M SOM estimate is speculative and must be tested. We use cookies for analytics and product improvement, including session recording via PostHog. Declining keeps the site fully functional with only strictly necessary cookies. See our Privacy Policy for details. Design by The Resonance | Powered by GPC – The AI Transformation Company 3. User Personas Sarah Divorcing working parent on 2-2-3 custody schedule • Plans her week around two households — school drop-offs, pickups, and activities must sync across both homes or chaos erupts • Discovers scheduling conflicts at 5pm when it is too late to fix them, then scrambles to text her ex-husband • Avoids conflict by not asking questions; prefers a shared system that shows the truth without requiring difficult conversations • Checks her phone constantly for updates from school, her ex, and her kid's activities — fragmented across text, email, and calendar apps • Values clarity and visibility over features; wants to see the full week at a glance and know instantly if there is a gap or overlap • See the entire family's schedule in one view so conflicts and gaps are visible before 5pm • Invite her ex-husband and have him see updates instantly without nagging him to download yet another app • Reduce the mental load of tracking who is doing what, when, and whether it is actually happening • Get confirmation that her ex saw the update so she stops second-guessing whether he knows about the change Discovers conflicts too late: kid's soccer practice scheduled during her ex's pickup Marcus Noncustodial father, 2-2-3 shared custody • Wants to be present and reliable but feels out of the loop; his ex controls most communication channels • Resents being treated as a secondary parent; wants proof that he is engaged and on top of his kids' schedules • Prefers simple, direct information over long email threads or multiple back-andforths • Checks his phone sporadically; if the app does not push a notification, he misses updates • Values being able to show up on time and prepared — he does not want to ask his ex for details the day before pickup • Get clear, push-notified updates about schedule changes so he never misses a pickup or activity • Have a record he can point to showing he is on top of his kids' schedules and engaged as a parent • Share his own availability and constraints without having to explain himself to his ex repeatedly • See his kids' activities and know what to prepare for so he can show up as a capable, present parent Receives schedule updates via text from his ex, but they are buried in a long thread and he misses details KEY TRAITS GOALS PAIN POINTS KEY TRAITS GOALS PAIN POINTS We use cookies for analytics and product improvement, including session recording via PostHog. Declining keeps the site fully functional with only strictly necessary cookies. See our Privacy Policy for details. Design by The Resonance | Powered by GPC – The AI Transformation Company time, found out at 5pm Spends 20 minutes every Sunday trying to reconcile three different calendars and text threads to build the week Anxiety about missing something important because information is scattered across apps and conversations Cannot tell if her ex saw the update or if he is ignoring it; no confirmation that communication landed Feels the weight of coordination falling entirely on her shoulders because her ex does not engage with shared tools “I open the app and see the full week — school, soccer, my days, his days — all in one place. No more discovering at 5pm that we double-booked pickup.” Does not know if his ex is testing him or if she genuinely forgot to tell him about a schedule change Feels defensive when his ex says he is not engaged — he is engaged, but the communication system makes him look bad Worries he will show up late or unprepared because he did not get the message or misunderstood the time Cannot easily share his own plans without a long explanation “I get a notification that soccer moved to Thursday. I confirm I saw it. Done. No guessing, no didhe-get-the-message anxiety.” We use cookies for analytics and product improvement, including session recording via PostHog. Declining keeps the site fully functional with only strictly necessary cookies. See our Privacy Policy for details. Design by The Resonance | Powered by GPC – The AI Transformation Company Jamie Family law attorney or mediator recommending tools to clients • Recommends tools that reduce conflict and create accountability; wants clients to communicate through a system, not text • Needs records that are court-admissible or at least defensible if a dispute escalates • Prefers tools that are simple enough that clients actually use them instead of abandoning them after two weeks • Sees the same scheduling conflicts and miscommunications in 80% of her cases; knows a shared calendar solves half the problem • Recommends based on what works, not what is trendy; will stick with a tool if it reduces her caseload friction • Recommend a tool that clients will actually adopt and use consistently • Reduce the number of scheduling disputes that escalate to conflict or court • Have a clear, time-stamped record of who agreed to what, in case the case does escalate • Find an option that works for low-conflict parents so not every client needs a $300 per year court-grade platform Clients use text and email, creating ambiguity about who agreed to what and when High-conflict clients weaponize scheduling mistakes as evidence of the other parent's unreliability Clients ask for recommendations but then do not use the tool because it is too Dr. Patel Child psychologist working with families post-divorce • Sees the emotional toll of scheduling chaos on kids: uncertainty about where they will be, when they will see each parent, whether plans will change lastminute • Knows that predictability and clarity reduce anxiety in children; wants parents to model calm, organized co-parenting • Recommends tools that reduce parental conflict because conflict is the variable that damages kids most • Skeptical of tech solutions that add complexity; wants something so simple that it removes friction, not adds it • Values tools that help parents communicate about logistics so they can save emotional energy for actual parenting • Recommend a tool that helps parents communicate calmly about logistics without triggering defensiveness • Reduce the number of schedule-related conflicts that spill over into kids' anxiety or acting out • Help parents model organized, respectful co-parenting so kids see that logistics can be handled without drama • Find a solution that feels like teamwork, not litigation Kids express anxiety about schedule changes because they do not know if the change is real or if parents will fight about it Parents use scheduling disputes as proxy conflicts; the real issue is control, but it KEY TRAITS GOALS PAIN POINTS KEY TRAITS GOALS PAIN POINTS We use cookies for analytics and product improvement, including session recording via PostHog. Declining keeps the site fully functional with only strictly necessary cookies. See our Privacy Policy for details. Design by The Resonance | Powered by GPC – The AI Transformation Company complicated or requires the other parent to pay separately No simple, affordable option exists for lowconflict parents who just need visibility without court-grade documentation Spends time in mediation sessions clarifying what was actually agreed to because the record is unclear “I tell clients: put it in the app, not in a text. If it is in the app, it is real. If it is in a text, it is a fight waiting to happen.” manifests as you did not tell me about soccer Recommends communication tools but parents do not use them because they are designed for high-conflict situations and feel adversarial Sees parents spending emotional energy on logistics that could go to their kids instead No tool exists that feels collaborative and calm; everything feels like documentation for a potential court case “When parents can see the schedule clearly and confirm they both saw it, the kids feel it. The anxiety drops. That is the real outcome.” 4. Functional Requirements ID REQUIREMENT DESCRIPTION PRIORITY FR-1 Unified family calendar view: single screen shows all family members' schedules, custody transitions, activities, and appointments. Color-coded by person. Overlapping pickups, double-booked activities, and coverage gaps are visually flagged before they become 5pm surprises. HIGH FR-2 Two-parent invite and seen receipts: one parent creates the calendar and invites the co-parent via email or phone number. Co-parent joins with one tap. Every update push-notifies both parents. Confirmation badges show 'seen' status so neither parent wonders if the message landed. HIGH FR-3 Quick-add activity entry: parent types a plain-language event (e.g., 'soccer practice Tuesday 4pm'), assigns it to a family member, and it saves to the shared calendar instantly. Must support recurring events for weekly activities and every-other-week custody transitions. W HIGH e use cookies for analytics and product improvement, including session recording via PostHog. Declining keeps the site fully functional with only strictly necessary cookies. See our Privacy Policy for details. Design by The Resonance | Powered by GPC – The AI Transformation Company ID REQUIREMENT DESCRIPTION PRIORITY FR-4 Privacy-first data architecture: no behavioral tracking, no ads, no thirdparty data sharing. Children's location data (school addresses, activity venues) stored encrypted. COPPA-compliant by design. Parents control what data is shared and with whom. Required given COPPA enforcement began April 2026 and 20 state privacy laws are in effect as of 2026. HIGH FR-5 Mobile-first design: large tap targets, minimal typing, one-handed navigation. Parents must be able to add events while standing in a pickup line. No desktop-only features. Core flows complete in three taps or fewer. HIGH FR-6 Custody schedule templates: pre-built templates for 2-2-3, alternating weeks, 5-2-2-5, and every-other-weekend arrangements. Parent selects a template and the calendar auto-populates custody transitions. Reduces setup friction and ensures both parents see the same baseline schedule from day one. HIGH FR-7 Chore and task assignment: parents assign household tasks to themselves or the co-parent. Tasks appear on the shared calendar. Completion checkbox with timestamp reduces 'who's doing what' disputes. MED FR-8 Time-stamped event history and export: every event, change, and confirmation is logged with a timestamp. Parents can export the calendar as PDF or iCal for personal records or legal reference. Not court-grade documentation, but defensible if a dispute arises. MED FR-9 Meal planning and grocery sync: parent plans meals for their custody days. Grocery list auto-generates and syncs to the co-parent's view. Reduces duplicate shopping and last-minute meal scrambles across two households. LOW FR-10 Calendar integrations: read-only sync with Google Calendar, iCal, and Apple Calendar so parents can surface personal work unavailability on the shared family calendar. Family calendar remains the source of truth. LOW We use cookies for analytics and product improvement, including session recording via PostHog. Declining keeps the site fully functional with only strictly necessary cookies. See our Privacy Policy for details. Design by The Resonance | Powered by GPC – The AI Transformation Company 5. Non-Functional Requirements ID REQUIREMENT CATEGORY NFR-1 Calendar view must load fully within 2 seconds on a median 4G connection. Push notifications for schedule changes must deliver to both parents within 30 seconds of the triggering event. PERFORMANCE NFR-2 Core calendar read and write operations must maintain 99.5% uptime measured monthly. Scheduled maintenance windows must not exceed 2 hours per month and must occur between 02:00– 04:00 local time. RELIABILITY NFR-3 No behavioral tracking, no advertising SDKs, and no third-party data sharing. Children's location data (school addresses, activity venues) must be stored encrypted at rest using AES-256 and in transit using TLS 1.3 or higher. Data retention for deleted accounts must not exceed 30 days. PRIVACY NFR-4 All authentication must support multi-factor options. Co-parent invite links must expire within 72 hours and be single-use. Access to a family calendar must be revocable by either parent within the app without requiring support intervention. SECURITY NFR-5 The product must be COPPA-compliant by design as of the April 2026 enforcement date: no direct collection of personal data from children under 13, no persistent identifiers tied to minors, and a documented data-minimization policy. Must also satisfy the baseline requirements of the 20 state comprehensive privacy laws in effect as of 2026. COMPLIANCE NFR-6 Backend must support horizontal scaling to handle at least 50,000 concurrent household sessions without degradation in calendar load time. Architecture must allow per-region data residency to support future compliance requirements without a full re-platform. SCALABILITY We use cookies for analytics and product improvement, including session recording via PostHog. Declining keeps the site fully functional with only strictly necessary cookies. See our Privacy Policy for details. Design by The Resonance | Powered by GPC – The AI Transformation Company ID REQUIREMENT CATEGORY NFR-7 Time-stamped event history (FE-05) must be append-only in storage: no record may be silently modified or deleted after creation. Export integrity must be verifiable via a checksum included in every PDF and iCal export. SECURITY 6. Success metrics Both-parent activation rate 70% of invited co-parents complete onboarding and add at least one event within 7 days of the primary parent's invite MEASURED ACROSS THE FIRST 90 DAYS POSTLAUNCH Day-30 retention 25% of households where both parents activated still have at least one parent opening the app weekly by Day 30 (baseline: ~6% average across consumer apps per Business of Apps, 2026) ROLLING 30-DAY COHORT WINDOW STARTING AT LAUNCH Conflict-detection engagement 60% of active households view the weekly conflict-detection summary at least once per week WITHIN 60 DAYS OF LAUNCH Paid conversion rate 5% of free-trial households convert to a paid subscription at or before end of trial period WITHIN 6 MONTHS OF LAUNCH We use cookies for analytics and product improvement, including session recording via PostHog. Declining keeps the site fully functional with only strictly necessary cookies. See our Privacy Policy for details. Design by The Resonance | Powered by GPC – The AI Transformation Company Annual subscription retention 30% of paying households renew at the 12-month mark (reference: apps with low-cost annual plans retain up to 36% after year one per RevenueCat, 2025) 12 MONTHS AFTER FIRST PAID COHORT 7. Constraints BUSINESS CONSTRAINT Per-family pricing only. No per-parent billing. AppClose and TalkingParents both ended free tiers in early 2026, setting market price expectations at $100–$300 per household per year. This product must price at or below that range per household to compete. A free tier is not planned, so conversion from trial to paid must be demonstrated before Phase 2 investment is committed. TIMELINE CONSTRAINT Phase 1 (Unified Calendar and Two-Parent Invite) is the only phase currently in scope for initial release. All Phase 1 features must ship before Phase 2 (Custody Templates and Conflict Detection) begins. No release date is set as of 2026-07-08. Zero customer interviews have been completed; the next step before any build commitment is validating demand with at least 20 divorced parents to confirm willingness to pay over existing free alternatives. 8. Scope & Open Questions OUT OF SCOPE • Court-admissible certified records and legal documentation features (Phase 4 and beyond) • Secure in-app co-parent messaging channel • Expense tracking and shared cost management • Integration with Google Calendar, iCal, or Apple Calendar (Phase 4) DEPENDENCIES • Push notification delivery infrastructure (e.g., APNs for iOS, FCM for Android) must be operational before two-parent confirmation badges can function • App store distribution via Apple App Store and Google Play, including review and approval timelines We use cookies for analytics and product improvement, including session recording via PostHog. Declining keeps the site fully functional with only strictly necessary cookies. See our Privacy Policy for details. Design by The Resonance | Powered by GPC – The AI Transformation Company • Custody schedule templates and conflict detection automation (Phase 2) • Chore and task assignment module (Phase 3) • Meal planning and grocery sync (Phase 3) • Support for more than two co-parents or blended-family configurations with three or more guardians • Web or desktop interface; v1 is mobile-only • Localization beyond English for v1 • Legal review of COPPA compliance posture and state privacy law obligations before public launch • Encrypted cloud storage provider capable of AES-256 at-rest encryption for children's location data • Payment processor integration for subscription billing prior to any paid-tier launch ASSUMPTIONS • Both parents own a smartphone capable of running a current-generation iOS or Android app; the product does not need to support feature phones or SMS-only workflows • Low-conflict co-parents will accept a perhousehold subscription price in the range implied by the market ($100/year), given that AppClose and TalkingParents both ended free tiers in early 2026 • The primary parent (Sarah persona) is the acquisition entry point; the co-parent (Marcus persona) joins via invite and does not need to discover the product independently • Demand validation (20 customer interviews recommended in the brief verdict) will occur before Phase 1 development begins, not after • The 3% paid penetration assumption used in the SOM estimate ($12M est.) is speculative and not sourced; actual conversion rates are unknown until a pilot is run OPEN QUESTIONS • Will low-conflict co-parents pay for a calendaronly product when Google Calendar and Cozi (freemium) already solve basic shared scheduling for free? No customer interviews or pre-sales data exist yet to answer this. • What is the minimum viable invite flow that gets a resistant or disengaged co-parent (Marcus persona) to activate? No usability data exists. • Does the two-sided adoption problem require an incentive or nudge for the second parent, or does a simple email/SMS invite achieve acceptable activation rates? • What pricing model maximizes both conversion and the annual retention target? Per-household annual vs. monthly vs. freemium with paid upgrade is unresolved. • Are time-stamped event logs (FE-05) sufficient for the family law attorney persona (Jamie) to recommend the product, or does courtadmissibility require a certified records feature that is currently out of scope? • What is the actual Day-30 retention baseline for co-parenting calendar apps specifically? The 6% figure cited (Business of Apps, 2026) is a broad consumer app average and may not reflect structural retention advantages of co-parenting use cases. • How should the product handle a custody arrangement change mid-year (e.g., court order We use cookies for analytics and product improvement, including session recording via PostHog. Declining keeps the site fully functional with only strictly necessary cookies. See our Privacy Policy for details. Design by The Resonance | Powered by GPC – The AI Transformation Company modification)? The data model for custody templates is not yet defined. Want to speak with a strategist about your idea? An AI verdict gets you started. A strategist gets you unstuck. Book time with The Resonance to pressure-test your idea, find where it breaks, and figure out what to build first. Book something with us We use cookies for analytics and product improvement, including session recording via PostHog. Declining keeps the site fully functional with only strictly necessary cookies. See our Privacy Policy for details. Design by The Resonance | Powered by GPC – The AI Transformation Company

Make My PRD

Design by The Resonance | Powered by GPC – The AI Transformation Company

    PRD: PRD Shared Calendar for Co-Parents 1