PulseList

Make group playlists feel effortless, fair, and fun.

PulseList is a collaborative playlist app for friends planning parties, road trips, and hangouts. It lets people suggest songs, vote on tracks, and shape shared playlists in real time so the group ends up with music everyone actually wants to hear. It reduces the awkwardness of one person controlling the aux cord and gives hosts a simple way to keep the vibe right.

Business Goals

  • Reach 25,000 monthly active users within 12 months of launch.
  • Convert at least 8% of invited listeners into recurring contributors within 90 days.
  • Achieve a 35% week-4 retention rate for users who join or create a playlist.
  • Generate 15% of signups through organic sharing links and playlist invites within 6 months.
  • Keep support tickets below 2% of monthly active users by maintaining a low-friction onboarding flow.

User Goals

  • Create a shared playlist in under 2 minutes.
  • Let a group vote songs up or down without needing a complex setup.
  • Keep the playlist matched to the event mood, such as party, chill, or road trip.
  • Avoid duplicate or off-theme song suggestions from dominating the queue.
  • Allow hosts to quickly finalize and export or play the playlist in a common music app.

Non-Goals

  • Building a full music streaming service or hosting audio files ourselves.
  • Supporting live synchronized playback across all devices in version 1.
  • Replacing every feature of Spotify, Apple Music, or YouTube Music.
  • Building complex event ticketing, invitations, or social networking beyond playlist collaboration.

Host Hannah, 31 - Hannah organizes house parties and wants music to feel collaborative without spending the whole night curating it herself. She needs a fast way to collect songs from friends and keep the vibe consistent.

Host Hannah, 31

  • As a host, I want to create a party playlist and share a link, so that guests can contribute immediately.
  • As a host, I want to approve or remove low-quality suggestions, so that the playlist stays on theme.
  • As a host, I want to see which songs are trending with the group, so that I can make a confident final set.

Road Trip Raj, 27 - Raj plans long drives with friends and wants the playlist to stay fresh over hours, not just the first 20 minutes. He cares about fairness, variety, and offline reliability in low-signal conditions.

Road Trip Raj, 27

  • As a passenger, I want to suggest songs from my phone, so that I can shape the trip soundtrack.
  • As a passenger, I want to vote on tracks with one tap, so that the best songs rise quickly.
  • As a group member, I want the playlist to avoid repeats and back-to-back similar songs, so that the trip stays interesting.

Social Sam, 22 - Sam joins events through shared links and is usually reluctant to install yet another app. He wants a quick, low-friction way to participate from a browser or lightweight app.

Social Sam, 22

  • As a guest, I want to join with a shared link and nickname, so that I can participate without a complicated sign-up.
  • As a guest, I want to see the current vibe and top-voted songs, so that I can add something appropriate.
  • As a guest, I want to upvote or skip suggestions instantly, so that I can influence the playlist in seconds.

Playlist Creation and Sharing · High priority

  • Users must be able to create a shared playlist room, define the event context, and invite others quickly.
  • Create a playlist room with title, event type, and optional mood presets such as Party, Road Trip, Chill, or Workout.
  • Generate a shareable link and QR code for guests to join from mobile or desktop.
  • Allow both authenticated users and guest participants with nickname-based access.
  • Support host controls for closing the room, locking suggestions, or ending contributions.
  • Display the playlist owner and current contribution rules clearly to all participants.

Song Suggestion and Search · High priority

  • Participants need a fast way to find and submit tracks from supported catalogs or a pasted link.
  • Search by song title, artist, album, or paste a Spotify, Apple Music, or YouTube link.
  • Prevent duplicate submissions by matching track IDs and near-duplicate metadata.
  • Show preview metadata including cover art, duration, and source service before submission.
  • Validate unavailable, region-locked, or unsupported tracks with clear error messaging.
  • Allow the host to optionally require a reason or note with each suggestion for moderation.

Voting and Ranking Engine · High priority

  • The core collaboration mechanic is a real-time vote system that ranks songs fairly and visibly.
  • Support upvote, downvote, and optional skip votes depending on room settings.
  • Update ranking in near real time for all participants in the room.
  • Use a score algorithm that balances vote count, recency, and diversity to avoid stale dominance.
  • Prevent vote spam using per-user rate limits and one-vote-per-track rules.
  • Show each user whether their vote was recorded and update counts instantly.

Queue and Playlist Moderation · Medium priority

  • The host must be able to curate the final output while still preserving group input.
  • Allow the host to pin, hide, reorder, or delete tracks from the queue.
  • Offer automatic filtering for explicit content and configurable genre or BPM constraints.
  • Provide a review screen for pending submissions in rooms with approval mode enabled.
  • Track moderator actions in an audit log for transparency.
  • Allow the host to export the final playlist to connected services such as Spotify.

Playback and Event Handoff · Medium priority

  • The product should help users move from collaborative planning to actual listening with minimal friction.
  • Provide a final playlist summary view with top songs and total duration.
  • Allow export to Spotify playlist creation and Apple Music playlist creation when authorized.
  • Offer a one-tap open-in-app flow for supported streaming services.
  • Show a fallback web-based queue view if the external service is unavailable.
  • Preserve event history so users can reuse successful playlists for future gatherings.

Fast Start Onboarding

  • Open the app and choose Create Playlist or Join with Link.
  • If creating, enter event name, type, and optional mood in under 30 seconds.
  • If joining, enter a nickname and confirm room rules.
  • Share the room link or QR code with friends immediately.
  • See the first votes and suggestions arrive within 60 seconds of room creation.
  • Reach meaningful value in under 2 minutes: one active room with at least one vote or suggestion.

1. Create the Room

  • The host sets up a playlist room with minimal required fields and immediately gets a shareable invite.
  • Require only playlist name and event type to start.
  • Offer default settings tuned for parties and road trips.
  • Handle empty or invalid names with inline validation and helpful examples.

2. Join and Discover

  • Guests join from link or QR code and can see the room vibe, current queue, and rules before contributing.
  • Support guest access without forcing account creation.
  • Display room status, host name, and contribution mode clearly.
  • If the room is locked or full, show a friendly read-only state.

3. Suggest Songs

  • Participants search the catalog or paste a track link, then submit a song to the room.
  • Search results should prioritize exact matches and common services.
  • Prevent duplicate track adds and explain why a song was rejected.
  • Handle unsupported sources with a clear path to search manually.

4. Vote and Rank

  • All participants can vote on tracks and watch the queue reorder in real time.
  • Update score and rank instantly after each vote.
  • Show a visual indicator for rising, falling, or pinned tracks.
  • If network latency occurs, queue the action locally and reconcile when reconnected.

5. Finalize and Export

  • The host reviews the winning set, cleans up the queue, and exports it to a streaming service.
  • Allow preview of total runtime and explicit content flags before export.
  • If export fails, provide retry and copy-link fallback.
  • Store the finished playlist as a reusable event template.

Power User Features

  • Smart queue balancing to avoid three slow songs in a row or repeated artists too close together.
  • Optional approval mode where host must accept each submission before it enters voting.
  • Collaborative presets for different event types with reusable rules and defaults.
  • Cross-service import from an existing Spotify playlist to seed the room.
  • Live moderation tools for muting disruptive users, removing spam, and freezing votes near the end of the event.

Interface Principles

  • Large, high-contrast vote buttons usable in dim party lighting and on mobile screens.
  • Real-time animation for song movement that remains readable and does not over-animate.
  • Accessibility support with keyboard navigation, screen-reader labels, and color-independent vote states.
  • Fast performance target of under 200 ms perceived response for vote interactions.
  • Clear host versus guest affordances so control boundaries are obvious at all times.

Hannah is hosting a birthday party and does not want to spend the night acting as DJ. She creates a PulseList room in less than a minute, shares the QR code, and her friends start adding songs from their phones as they arrive.

As the room fills up, guests upvote the tracks they want and downvote the ones that do not fit the mood. The playlist reorders in real time, Hannah pins the crowd favorites, and the group ends with a playlist that feels like everyone contributed.

After the party, Hannah exports the final list to Spotify and saves the room as a reusable template. PulseList gives the group a better shared music experience while creating repeat usage through memorable events and easy sharing.

User-Centric Metrics

  • Median time from room creation to first contribution under 2 minutes.
  • At least 70% of new rooms receive a second participant within 10 minutes.
  • At least 60% of active rooms receive 10 or more song suggestions.
  • Voting interaction success rate above 98% with visible confirmation.
  • Guest join completion rate above 85% from shared invitation links.

Business Metrics

  • Monthly active users grow 20% month over month in the first six months.
  • Guest-to-registered user conversion reaches 12% within 90 days.
  • 30-day retention for room creators reaches 35% or higher.
  • At least 25% of new rooms are shared to 3 or more participants.
  • Organic invite-driven acquisition contributes 15% or more of new signups.

Technical Metrics

  • 99.9% monthly uptime for core playlist room services.
  • Vote and suggestion API p95 latency under 300 ms.
  • Zero critical security incidents related to guest room access.
  • Real-time sync success rate above 99% for connected clients.

Tracking Plan

  • Track room_created with event type, source, and host device.
  • Track invite_shared with channel, room ID, and recipient count.
  • Track guest_joined with auth state and time since invite.
  • Track song_suggested with source service, search path, and duplicate status.
  • Track vote_cast with vote type, track ID, and client latency.
  • Track playlist_exported with destination service and export success or failure.
  • Track moderation_action with action type, target track, and host ID.

Technical Needs

  • Frontend built in Next.js with React and TypeScript for fast iteration and SSR sharing pages.
  • Backend API in Node.js with NestJS or Express for room, playlist, and moderation services.
  • Real-time updates using WebSockets or Supabase Realtime for low-latency vote synchronization.
  • Primary datastore in PostgreSQL for rooms, users, votes, tracks, and audit logs.
  • Redis for rate limiting, ephemeral room state, and live presence tracking.
  • Background jobs using BullMQ or a managed queue for playlist export and metadata sync.
  • Object storage such as S3 for cached artwork and exported artifacts.

Integration Points

  • Spotify Web API for search, playlist import, and playlist export.
  • Apple Music API where available for export and catalog lookup.
  • YouTube Music or YouTube search fallback for link parsing and metadata enrichment.
  • Auth0, Clerk, or Supabase Auth for optional account creation and social login.
  • SendGrid or Postmark for optional invite and notification emails.

Data Storage & Privacy

  • Store only necessary user profile data such as nickname, email, and auth provider ID.
  • Treat guest nicknames and room participation as personal data under GDPR and provide deletion support.
  • Encrypt data in transit with TLS 1.2+ and sensitive fields at rest.
  • Provide clear consent for connecting external music accounts and revoke access on disconnect.
  • Maintain audit logs for moderation actions while limiting retention to a defined period, such as 90 days.

Scalability & Performance

  • Design rooms as horizontally scalable, stateless API nodes behind a load balancer.
  • Use efficient fan-out for real-time events so one room spike does not impact others.
  • Cache track metadata and artwork to reduce repeated catalog calls.
  • Support burst traffic during events with 100 to 300 concurrent users in a single room.

Potential Challenges

  • Duplicate song submissions can clutter the queue; mitigate with metadata deduping and fuzzy matching.
  • Real-time vote conflicts may occur on flaky networks; mitigate with optimistic UI and server reconciliation.
  • External music APIs may rate-limit or change behavior; mitigate with caching, retries, and provider abstraction.
  • Guest abuse or spam can degrade room quality; mitigate with rate limits, invite tokens, and host moderation tools.
  • Licensing or regional catalog differences may break export expectations; mitigate with provider availability checks and clear fallback messaging.

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

Phase 1: MVP Room Collaboration · Weeks 1–4

  • Create and join playlist rooms with invite links and QR codes.
  • Search and suggest songs from one primary provider, starting with Spotify.
  • One-vote-per-track real-time ranking with guest access.
  • Basic host moderation: remove track, lock room, end session.

Phase 2: Playback Handoff and Polish · Weeks 5–8

  • Export playlists to Spotify.
  • Playlist summary and final queue review screens.
  • Improved onboarding, empty states, and mobile-first UI.
  • Analytics instrumentation for invites, suggestions, votes, and exports.

Phase 3: Moderation and Smart Ranking · Weeks 9–12

  • Approval mode for high-control rooms.
  • Duplicate detection and anti-spam protections.
  • Smart ranking rules for recency and variety.
  • Pinned tracks, explicit content filtering, and host audit history.

Phase 4: Scale and Expansion · Weeks 13–16

  • Additional catalog support or export provider integration.
  • Reusable event templates and playlist history.
  • Performance hardening for larger concurrent rooms.
  • Guest retention features such as lightweight accounts and saved favorites.

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

Build a mobile-first collaborative playlist web app called PulseList.

Product summary:
PulseList lets a host create a shared playlist room for parties or road trips, invite friends by link or QR code, let guests suggest tracks, and let everyone vote songs up or down in real time. The host can moderate the queue, pin/remove tracks, and export the final playlist to Spotify.

Core screens and flows:
1. Landing page with Create Room and Join Room actions.
2. Create Room modal/page: playlist name, event type, mood preset, optional approval mode.
3. Join Room flow: nickname entry, room rules, then room lobby.
4. Room screen: current queue, search bar, suggestion composer, vote controls, live ranking, participant presence, host controls.
5. Finalize screen: playlist summary, runtime, explicit flags, export to Spotify.
6. Simple reusable room history page for hosts.

Functional requirements:
Use guest-friendly access with optional sign-in via Clerk or Supabase Auth.
Support real-time room synchronization with WebSockets or Supabase Realtime.
Implement song search and metadata lookup using Spotify Web API first, with track deduplication by provider track ID and fuzzy title/artist matching.
Support one-vote-per-user-per-track, optimistic UI updates, host moderation, track pinning, and room lock/end states.
Include rate limiting, spam prevention, and error states for unsupported tracks or failed exports.

Data model:
User(id, email, displayName, authProvider, createdAt)
Room(id, hostUserId, name, eventType, moodPreset, approvalMode, isLocked, isActive, createdAt)
RoomMember(id, roomId, userId nullable, guestName, role, joinedAt, lastSeenAt)
Track(id, provider, providerTrackId, title, artist, album, durationMs, artworkUrl, explicit, externalUrl)
Suggestion(id, roomId, trackId, suggestedByMemberId, status, note, createdAt)
Vote(id, roomId, trackId, memberId, voteType, createdAt)
QueueItem(id, roomId, trackId, rank, pinned, hidden, score, createdAt)
ModerationAction(id, roomId, actorMemberId, actionType, targetType, targetId, metadataJson, createdAt)
ExportJob(id, roomId, destination, status, externalPlaylistId, errorMessage, createdAt)

Default tech stack:
Next.js 14, React, TypeScript, Tailwind CSS, shadcn/ui, PostgreSQL, Prisma, Redis, Node.js API routes or NestJS, Supabase Realtime or Socket.io, Clerk for auth, Stripe not needed for MVP.

Implementation guidance:
Prioritize fast mobile UX, large tap targets, accessibility, and under-200ms perceived vote updates.
Build clean state management for live room sync, robust error handling for network disconnects, and a simple but polished UI.
Provide seeded demo data, responsive layouts, and production-ready environment variable handling.
Ship the MVP with one music provider integration first, then structure the code so additional providers can be added later.

Business Idea

I want to build a collaborative playlist app where friends can vote on songs, suggest tracks, and create shared playlists for parties or road trips.

Make My PRD

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

    PRD: I want to build a collaborative playlist app where...