Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
*** Now with Spotify and Apple Music integration ***
Free · In-app purchases
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for djay - DJ App & AI Mixer: map the core Music workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
*** Now with Spotify and Apple Music integration *** Welcome to djay! The #1 DJ app and winner of multiple Apple Design Awards lets you start mixing your favorite music instantly. Connect your Spotify or Apple Music account to access millions of songs and create your own DJ mixes in no time – right inside djay. djay transforms your iOS device into a full-featured DJ system. Seamlessly integrated with your music library, djay allows you to mix your favorite songs and playlists. You can perform live, remix tracks, or enable Automix mode to let djay create a seamless mix for you automatically. Whether you are a professional DJ or a beginner who just loves to play with music, djay offers you the most intuitive yet powerful DJ experience on an iOS device. SPOTIFY INTEGRATION • Access to the full Spotify music catalog • Your playlists, editorial selections, and more seamlessly integrated • Powerful search capabilities for the vast music catalog of Spotify APPLE MUSIC INTEGRATION • Access to over 100 million songs • Your library: all your music seamlessly integrated • Powerful search capabilities for the vast music catalog of Apple Music • Match: recommendations based on the currently playing song • Add songs and playlists to your Apple Music library right from within djay ADVANCED MEDIA LIBRARY • Spotify: Millions of tracks + your own playlists (Spotify Premium subscription) • Apple Music: Millions of tracks + your personal library in the cloud (Apple Music subscription) • TIDAL: Millions of tracks, music videos, high quality sound (TIDAL DJ Extension) • SoundCloud: Millions of underground and premium tracks (SoundCloud Go+) • Beatport: Millions of electronic music tracks (Beatport Advanced Subscriptions) • Beatsource: Millions of open-format music tracks (Beatsource Subscription) • Files: access files in the cloud (e.g. Dropbox), on your iOS device, or on external hard drives seamlessly • My Collection: Powerful playlists management and meta data editing AUTOMIX • Automatic, beat-matched mixes • Queue and Playlist automation NEURAL MIX™ • Isolate vocals, drums, and instrumentals in real time (not available with Apple Music or Spotify) MUSIC PRODUCTION TOOLS • Sequencer: create beats on top of your music live • Looper: remix your music with up to 48 loops per track • Beat-matched sequencing of drums and samples • Extensive content library with 1000+ loops and samples. HARDWARE INTEGRATION • Plug-and-play integration with 100+ MIDI controllers by Pioneer DJ, AlphaTheta, Reloop, Hercules, Numark, Denon DJ • Digital Vinyl System (DVS) Integration • Advanced MIDI Learn to map any class-compliant MIDI controller • Support for Bluetooth audio and MIDI • Support for multi-channel USB audio interfaces and video output POWERFUL AUDIO ENGINE • Ableton Link integration • High-quality mixer, filter, EQ, isolator, and limiter • Advanced time-stretching and pitch shifting • Over 40 built-in audio effects • Live recording ADVANCED AUDIO ANALYSIS • Fluid Beat Grid: the world’s most sophisticated beat detection and sync engine • Key detection • Colored waveforms • Auto-Gain BUILT FOR iOS • Accessible via VoiceOver • Airplay, Apple Watch, and iCloud integration The optional PRO subscription allows you to subscribe once and use djay Pro across all your Mac and iOS devices, including access to all PRO features, as well as 1000+ loops, samples, and visuals. Cancel anytime. A supported streaming subscription and an internet connection are required to access songs from a streaming service in djay. No recording available for streamed songs. Neural Mix cannot be used when streaming from Apple Music or Spotify. Specific songs may not be available or accessible on your account or in your country. Streaming service availability and pricing may vary depending on country, currency and service.
Written user reviews are not shown here. Check current App Store reviews >
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Assumption to check: Complexity of mixing tracks can be overwhelming for beginners.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited offline access to tracks.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchases may confuse users.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Not all features are available on all devices.
Validate with people who use this workflow before building.
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.