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.
Your music, from your own server, everywhere
$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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Your music, from your own server, everywhere. play:Sub plays your Navidrome, Gonic, Subsonic or other Subsonic-compatible library on iPhone, iPad and Mac, in the car with CarPlay, on Chromecast or through your server's Jukebox - streamed in the quality you choose, or offline. NEW: AUTO SYNC • Keeps your starred songs, albums and artists, your newest albums or any playlist on your device, automatically • Choose per source: Download to keep it, or Cache to let it make room for other music NEVER LET THE MUSIC STOP • Auto DJ keeps playing when the queue runs out, with music related to what you started • Or pick an Auto Play mode: favorite artists, random albums, newest additions, artist radio, decade radio and more SERVERS • Navidrome, Gonic, Airsonic, Ampache, Funkwhale, Booksonic, Subsonic and more • OpenSubsonic support • Multiple servers, with easy switching • Some servers need their Subsonic API turned on AUDIO • FLAC, ALAC, AAC, MP3, OGG, WAV, AIFF, WEBM and more, without transcoding • Lossless and gapless playback, hi-res up to 24-bit/192 kHz • 10-band equalizer with presets, crossfade and ReplayGain • Playback speed from 0.5x to 2x • Audio Visualizer, and lyrics where your server has them PLAY ANYWHERE • iPhone, iPad and Mac (Apple silicon): any orientation, multitasking and resizable windows • CarPlay: your library, the play queue, server switching, and album and artist pages with play and shuffle buttons • Chromecast and Subsonic Jukebox • AirPlay, Bluetooth, headphone and car controls, Lock Screen and Control Center • Home Screen widgets you can play from • Picks up again after phone calls OFFLINE • Download music to keep it, or let the cache fill and trim itself • Played tracks are cached automatically, upcoming tracks preloaded • Download or cache single tracks or whole albums, artists, folders and playlists • Cached audio is upgraded to a better bitrate when available • Background downloads • The same app offline: browse, play, star and edit playlists, synced when you are back online BROWSE AND DISCOVER • Artists, albums, songs, folders, genres, decades and record labels • Playlists, favorites, podcasts, audiobooks and bookmarks • Recently added, frequently played and random • Artist radio, top songs and similar artists • Internet radio: your server's stations, plus 20,000+ from radio-browser.info • Search everything, filter by media folder or show only starred • Long-press anything for the actions that fit PLAYLISTS AND FAVORITES • Create, edit and delete playlists, personal or shared • Star artists, albums, songs, folders and record labels • 5-star ratings MAKE IT YOURS • Customizable tabs and library order • Light and dark themes that follow the system, or your own colors • Alternate app icons • Sleep timer CONNECTION • HTTPS, including self-signed certificates • Token authentication on Subsonic 5.3+ servers • Separate bitrates for cellular and Wi-Fi, with overrides for slow or fast Wi-Fi networks SCROBBLING • Scrobbles to Last.fm through your server, and updates Now Playing • Cached plays count too; offline plays are scrobbled when back online Requires a server with the Subsonic API 1.8 or newer (Subsonic 4.8+; Subsonic itself needs a Premium license for apps). Some features depend on your server, such as top songs, artist radio, similar artists and record labels.
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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.
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.