HabitLoop

Build habits that stick, and let progress speak for itself.

HabitLoop is a small habit-tracking app for people who want a simple way to build routines without app bloat. It helps users define habits, get weekly reminders, log streaks, and share progress as a public or private link to stay accountable. The product matters because it turns habit tracking into a lightweight weekly ritual instead of another abandoned to-do app.

Business Goals

  • Reach 1,000 weekly active users within 90 days of launch.
  • Convert at least 8 percent of signups to paid subscribers within 6 months if a premium tier is added.
  • Maintain a 35 percent or higher 4-week retention rate among new users.
  • Generate at least 20 percent of new signups from shared progress links by month 4.
  • Keep support tickets below 2 percent of monthly active users by keeping the product intentionally simple.

User Goals

  • Create a habit in under 2 minutes and start tracking immediately.
  • Receive a reliable weekly reminder to review progress and log completion.
  • See streaks, completion rate, and weekly consistency at a glance.
  • Share progress with friends, family, or accountability partners using a simple link.
  • Stay motivated with a low-friction app that does not overwhelm with extra features.

Non-Goals

  • No full coaching marketplace or human accountability service.
  • No complex meal plans, exercise programming, or AI-generated habit advice in MVP.
  • No social feed, public comments, or follower network.
  • No enterprise team dashboards or workplace performance reporting.

Busy Professional Lena, 32 - Lena wants to build a few small routines like reading, stretching, and journaling. She needs a quick way to log progress and a reminder that does not feel intrusive.

Busy Professional Lena, 32

  • As a busy professional, I want to create a habit in seconds, so that I can start without overthinking.
  • As a busy professional, I want a weekly reminder summarizing my progress, so that I can reflect and reset.
  • As a busy professional, I want to share a read-only progress link, so that a friend can keep me accountable.

Student Amir, 20 - Amir is trying to maintain study and workout habits while balancing classes. He prefers simple visual feedback and mobile-friendly interactions.

Student Amir, 20

  • As a student, I want to mark habits complete from my phone, so that logging does not interrupt my day.
  • As a student, I want to see streaks and completion percentage, so that I know whether I am improving.
  • As a student, I want to pause a habit temporarily, so that breaks do not destroy my streak history.

Accountability Partner Sophie, 41 - Sophie is supporting a partner or friend who wants encouragement without constant messaging. She only needs to view progress, not edit it.

Accountability Partner Sophie, 41

  • As an accountability partner, I want to open a shared link and view weekly progress, so that I can encourage someone without needing an account.
  • As an accountability partner, I want to see a clear summary of completed and missed weeks, so that feedback is grounded in real data.
  • As an accountability partner, I want shared progress to respect privacy settings, so that only approved habits are visible.

Habit Management · High priority

  • Users must be able to create, edit, pause, and archive habits quickly with minimal setup.
  • Allow habit creation with name, frequency set to weekly or custom days, reminder day/time, and optional note.
  • Support editing habit name, reminder schedule, visibility, and active state without losing history.
  • Validate required fields and prevent duplicate habit names per user when active.
  • Archive habits instead of deleting by default to preserve streak and completion history.
  • Display active, paused, and archived habits separately.

Weekly Reminders · High priority

  • The app must send dependable weekly reminders that prompt users to review and log progress.
  • Send reminders via email in MVP, with optional push notifications if implemented later.
  • Support user-selected reminder day and local time zone.
  • Generate reminder content that includes unfinished habits and current streak status.
  • Suppress reminders for archived habits and allow users to mute a habit for one week.
  • Retry failed sends and log delivery status for debugging.

Progress Logging and Streaks · High priority

  • Users need a simple way to log completion and understand their consistency over time.
  • Allow one-tap completion for each habit on its scheduled day.
  • Track weekly completion percentage, current streak, and longest streak.
  • Handle missed weeks without breaking historical data integrity.
  • Allow retroactive logging for the previous 7 days only to correct mistakes.
  • Show no-data states clearly for new habits with zero completed weeks.

Sharing and Privacy · High priority

  • Users should be able to share progress safely with controlled visibility.
  • Create shareable read-only links for an individual habit or a weekly summary page.
  • Support public, unlisted, and private sharing modes.
  • Allow users to revoke a share link immediately.
  • Hide habit notes and personal metadata unless explicitly shared.
  • Display a clear preview of what the recipient will see before publishing.

Analytics and Insights · Medium priority

  • The app should provide lightweight feedback that helps users stay motivated without becoming complex.
  • Show weekly completion rate, streak trends, and missed-week count on the dashboard.
  • Surface a simple consistency score based on the last 4 to 8 weeks.
  • Provide basic filters by habit and date range.
  • Avoid overloading the user with charts; default to a summary-first view.
  • Prepare data for future premium insights without requiring redesign.

First-Time User Experience

  • Open landing page or app and choose Sign up with email or continue with Google.
  • Create first habit using a guided form with just name, reminder day, and time.
  • Confirm time zone and notification permission in one lightweight step.
  • Land on dashboard showing the new habit, next reminder time, and a clear call to log today.
  • Reach first value in under 2 minutes from signup to first habit created.

1. Create Habit

  • The user adds a habit with only the essentials and can expand details later.
  • Validate that name is not empty and reminder time is in the future or a valid recurring schedule.
  • Inline preview shows how the habit will appear on the dashboard and reminder.
  • If notification permission is denied, keep the habit and offer email fallback.

2. Review Weekly Reminder

  • Each week, the user receives a concise reminder to review habits and log progress.
  • Reminder includes active habits, streak summary, and a direct link to the check-in page.
  • Respect local time zone and user mute settings.
  • If the user has no active habits, suppress reminders and show onboarding nudges instead.

3. Mark Progress

  • The user checks off completed habits with one tap and sees immediate feedback.
  • Completion updates streaks and weekly totals instantly after save.
  • Prevent duplicate completion entries for the same habit and day.
  • If offline or request fails, queue the action locally and sync on reconnect.

4. Share Progress

  • The user generates a link to share a habit or weekly summary with others.
  • Choose visibility level before creating the link.
  • Show a confirmation modal describing exactly what is exposed.
  • If link is revoked, previously shared URL should render a revoked state.

5. Reflect and Return

  • The user reviews history, sees trends, and is encouraged to continue next week.
  • Highlight wins like best streak and improved consistency over the last month.
  • Show empty states for new users with helpful examples.
  • Offer a weekly recap email for users who miss the app.

Advanced and Edge Features

  • Pause a habit without resetting streak history.
  • Export personal progress as CSV or JSON.
  • Custom recurring schedules beyond weekly, such as Monday Wednesday Friday.
  • Pinned habits and reorderable dashboard.
  • Read-only shared summaries with optional expiry dates.
  • Graceful handling of timezone changes and daylight saving shifts.

Interface Principles

  • Mobile-first layout with one-tap completion and large touch targets.
  • High-contrast status indicators for completed, missed, paused, and archived states.
  • Accessible form labels, keyboard navigation, and screen-reader friendly summaries.
  • Fast initial load with skeleton states and optimistic updates.
  • Minimal visual clutter with summary cards above detail views.
  • Respect reduced-motion preferences and avoid distracting animations.

Lena has tried habit apps before, but they always became another place to manage instead of a tool that helped. HabitLoop lets her create a reading habit in under a minute, then quietly reminds her every week to check in. She logs progress in one tap and can see her streak without digging through menus.

After a month, Lena shares her progress link with a friend. Instead of vague encouragement, her friend can see a simple weekly summary and celebrate consistency. That accountability keeps Lena engaged, improves retention, and gives the product a natural growth loop through sharing.

User-Centric Metrics

  • At least 70 percent of new users create their first habit within 2 minutes.
  • At least 60 percent of active users log progress in the same week they receive a reminder.
  • At least 45 percent of users maintain at least one 4-week streak within 30 days.
  • Average weekly check-in completion rate of 65 percent or higher.
  • At least 25 percent of users share a progress link within the first 30 days.

Business Metrics

  • 35 percent or higher 4-week retention for new signups.
  • 8 percent or higher conversion to paid if premium is introduced.
  • 20 percent of signups sourced from shared links by month 4.
  • Monthly active users grow by 15 percent month over month for the first 3 months after launch.

Technical Metrics

  • 99.9 percent uptime for core app and reminder services.
  • Dashboard and habit list load in under 1.5 seconds on average.
  • Reminder jobs deliver or log failure within 10 minutes of scheduled send time.
  • No P1 security incidents and full audit logging for share link access.

Tracking Plan

  • track_signup_completed
  • track_first_habit_created
  • track_reminder_sent
  • track_reminder_opened
  • track_progress_logged
  • track_share_link_created
  • track_share_link_opened

Technical Needs

  • Next.js frontend with server actions or API routes for core mutations.
  • PostgreSQL database hosted on Supabase with Row Level Security.
  • Drizzle ORM for schema definition and type-safe queries.
  • Background jobs for reminder scheduling using Supabase cron, Trigger.dev, or similar.
  • Authentication with email magic links and Google OAuth.
  • File-free design to keep storage simple; only structured relational data.
  • Responsive PWA-ready UI for mobile-first use.

Integration Points

  • Supabase Auth for login and session management.
  • SendGrid or Resend for weekly email reminders.
  • Google OAuth for quicker account creation.
  • PostHog or Amplitude for product analytics.
  • Stripe only if premium tiers or paid sharing features are added later.

Data Storage & Privacy

  • Store only essential personal data: email, display name, timezone, and notification preferences.
  • Use Row Level Security so users can only access their own habits and private summaries.
  • Shared links must expose only explicitly selected fields and support immediate revocation.
  • Provide data export and deletion to support GDPR and CCPA requests.
  • Keep reminder and share access logs for abuse detection, but limit retention to 90 days unless needed for security.

Scalability & Performance

  • Use indexed queries for active habits, weekly summaries, and share link lookups.
  • Precompute weekly aggregates to avoid expensive dashboard calculations on every load.
  • Queue reminder sends in batches to handle spikes without timing out.
  • Cache public share pages with short TTL while ensuring revocation is respected quickly.

Potential Challenges

  • Time zone drift can cause reminders to fire at the wrong local time; mitigate by storing user timezone and recalculating schedules when it changes.
  • Streak logic can become confusing around missed weeks and retroactive entries; mitigate with explicit rules and automated tests for date boundaries.
  • Shared links could leak more data than intended; mitigate with a strict visibility model and preview before publish.
  • Reminder deliverability may suffer due to spam filtering; mitigate with verified sending domains, unsubscribe handling, and concise email copy.
  • Users may forget the app if reminders feel noisy; mitigate with weekly frequency defaults, mute controls, and useful reminder summaries.

Team & resourcing - Small team - 2 engineers, 1 designer, part-time PM

Phase 1: MVP Foundations · Weeks 1-2

  • Auth with email and Google login
  • Database schema and Row Level Security
  • Create/edit/archive habit flow
  • Basic dashboard with active habits
  • Seeded local development and deployment pipeline

Phase 2: Tracking and Reminders · Weeks 3-4

  • One-tap progress logging
  • Streak and weekly completion calculations
  • Weekly email reminder job
  • Timezone-aware scheduling
  • Analytics instrumentation for core events

Phase 3: Sharing and Insights · Weeks 5-6

  • Shareable read-only links
  • Public and revoked share states
  • Weekly summary page
  • Trend cards and consistency score
  • Privacy controls and data export

Phase 4: Polish and Launch · Weeks 7-8

  • Mobile responsiveness and accessibility pass
  • Empty states and onboarding refinements
  • Performance optimization and caching
  • QA test suite for streak and reminder edge cases
  • Launch readiness checklist and monitoring dashboards

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

Build a small habit-tracking web app called HabitLoop using Next.js, TypeScript, Tailwind CSS, Supabase Postgres, Supabase Auth, and Drizzle ORM.

Product summary:
Users create simple habits, get weekly reminders, log progress with one tap, and share read-only progress links. Keep the app lightweight, mobile-first, and focused on weekly consistency rather than complex habit coaching.

Core screens and flows:
Landing page with sign up and login
Onboarding flow to create the first habit in under 2 minutes
Dashboard showing active habits, streaks, weekly completion, next reminder time
Habit detail page with history, edit, pause, archive, and retroactive logging for the last 7 days
Weekly check-in page triggered from reminder email
Share page for public, unlisted, or private read-only progress summaries
Settings page for timezone, notification preferences, data export, and account deletion

Data model:
users: id, email, name, timezone, created_at
habits: id, user_id, name, note, frequency_type, reminder_day, reminder_time, status, visibility, created_at, updated_at
habit_logs: id, habit_id, user_id, log_date, completed, source, created_at
share_links: id, user_id, scope_type, scope_id, visibility, token, expires_at, revoked_at, created_at
reminder_jobs: id, user_id, habit_id, scheduled_for, status, last_sent_at, error_message

Requirements:
Implement RLS so users only access their own private data.
Generate share links with secure random tokens and support revoke immediately.
Calculate current streak, longest streak, weekly completion rate, and missed weeks.
Support email reminders with timezone-aware weekly scheduling.
Use optimistic UI for logging completion.
Add analytics events for signup, habit creation, reminder sent/opened, completion logged, and share link created/opened.
Include empty states, loading skeletons, and accessibility-friendly labels.

Acceptance targets:
First habit can be created in under 2 minutes.
Dashboard loads in under 1.5 seconds on average.
Reminder flows respect local timezone.
Shared links only show explicitly allowed fields and can be revoked instantly.

Create the app structure, database schema, server actions or API routes, and the main UI components with clean, production-ready code.

Business Idea

Write a PRD optimized for AI coding tools. Include a TL;DR, user stories, functional requirements with P0/P1/P2 priorities, a file tree, a Supabase or Drizzle schema if relevant, ordered task list, and acceptance criteria. My project: a small habit-tracking app with weekly reminders and shareable progress.

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