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.
Stream your Subsonic-server-hosted music to your iOS or CarPlay device, Chromecast device or Subsonic Jukebox.
$4.99 · 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 play:Sub Music Streamer: 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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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: Limited offline capabilities
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inconsistent song metadata
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Poor social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited personalization options
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Stream your Subsonic-server-hosted music to your iOS or CarPlay device, Chromecast device or Subsonic Jukebox. Enjoy your music everywhere, anytime, in the quality you decide! play:Sub supports playback of most audio formats like FLAC, MP3, AAC and more. Lossless and gapless playback is supported, as well as crossfading between tracks. Use the 10-band fully customizable equalizer to get the right sound. The equalizer has presets for common genres and scenarios. Apply crossfade and replay-gain for the perfect listening experience. Browse your music your way, be it by folder, artist, album, decade. Control playback using gestures, buttons or remote controlled from you headset. Play on anything: builtin speaker, headphones, Bluetooth connected headphones/amp/speaker/car-stereo or AirPlay devices. play:Sub streams your music over any connection, and caches songs for when connectivity is bad. Played songs are cached automatically, and you can manually cache individual songs or entire folders, artists or albums. SERVER SUPPORT • Subsonic, AirSonic, Ampache, Madsonic, Funkwhale, Libresonic, Navidrome • Supports multiple servers and easy switching between them • Any Subsonic 4.8+ compatible server should work • You may need to enable Subsonic API on some server types USER INTERFACE • Dark and light UI themes • All orientations, incl. iPad multitasking support AUDIO • FLAC, AAC, ALAC, MP3, MP4, OGG, WAV, AIFF, WEBM and more • Plays most audio formats without transcoding • Lossless playback (wo transcoding) • Gapless playback • 10-band equalizer • Crossfade • Replay Gain • HI-rez digital up to 24bit/192kHz • Variable playback speed (0.5-2x) PLAY ON • Any iOS device • CarPlay • Chromecast • Jukebox DISCOVERY • Artist radio. • Artist top songs • Similar artists • Be inspired by random artist, album or songs • Play random songs in a genre BROWSE YOUR MUSIC ANY WAY YOU LIKE IT • Artists, Albums, Songs • Folders • Playlists, Favorites, Genres • Podcasts, Audiobooks, Bookmarks • Decades • Filter by Subsonic mediafolder INTERNET RADIOSTATIONS • Server configured / shared internet radiostation. • 20000+ radiostation directory powered by radiobrowser,info PLAYLISTS • Create, update and delete playlists • Personal and shared playlists • Cache complete playlists to device • Full playlist support in both online and offline mode FAVORITES • Starring of artists, albums, tracks and folders • Starring works in both online and offline mode • Items starred when offline is synced at first chance • Easily filter lists for starred content GENRES • View All, Random or Starred albums from a genre • View Random or Starred songs from a genre CONTEXT MENU EVERYWHERE • Long-press any item to show relevant actions • Easily navigate between associated artist, album, tracks and folders • Add tracks, albums, artists or folders to playlists • Swipe-to-reveal shortcuts CACHING • Automatic caching of played tracks, pre-cache upcoming tracks • Manually cache selected folders, artists, albums or tracks • Upgrade cached audio to better bitrate when available SEAMLESS OFFLINE MODE • Play cached music when connectivity is bad • Show only cached content • Same user interface in online and offline mode INTEGRATION • AirPlay, Bluetooth, remote control, lock screen & control center integration • Support iOS’ sleep timer • Resumes music after being interrupted by phone calls • Background downloads CONNECTION • SSL, self-signed certificates • Secure authentication for Subsonic 5.3+ servers • cellular/wifi dependent bitrate; override settings for slow/fast WiFi networks SCROBBLING • Scrobbles to last.fm if configured on the server • Updates Now Playing on the server • Updates server-playcounts when playing cached content • Music played while offline is scrobbled when online again NOTE: a licensed installation of Subsonic 4.8+ is required. Some features need a higher server version (Top Songs, Artist Radio, Similar Artists, Last.fm Imagery, Album Info)
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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.