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.
AVSub is a fully featured, multi-language music and video streaming (after in-app purchase) app for SubSonic
$3.99 · 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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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 AVSub: 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 audio track variety for visualization.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of visual customization options.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Playback issues with certain audio formats.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inconsistent performance on older devices.
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.
AVSub is a fully featured, multi-language music and video streaming (after in-app purchase) app for SubSonic. With multi-format (including FLAC) support, quick & easy browsing, caching for offline listening or viewing, playlist support and a great user interface, accessing your media is fast and simple. With full Bluetooth Audio, Apple Watch, CarPlay, AVCast/Chromecast/FireTV & Airplay support too, you can have your media with you anywhere, anytime. Connect AVSub to your licensed SubSonic server and you'll have access to your entire media collection. AVSub supports any audio format that SubSonic supports and SSL. AVSub's user interface is easy to use. Buttons are large and clear and playback can be controlled by gestures. Optimized views for both portrait & landscape orientations make the most of your device. AVSub has full Bluetooth Audio support - stream to any Bluetooth device (car stereo, amplifier, speaker, headphones) with superb quality. Bluetooth remote-control is fully supported. AVSub also fully suports CarPlay. The AVSub Apple Watch extension is the easiest way to get your Subsonic playlists onto your watch. The extension supports full background playback. You can take your music with you even without your phone! AVSub supports caching so you can listen to your music or watch video even when you're not connected to the Internet. AVSub will intelligently cache what you listen to in the background, or you can choose to download tracks, albums or videos direct to the cache for quick pre-loading. Cache size is configurable, along with options such as cache reading & writing and the ability to control direct-downloading over a mobile/cellular network. Cache management in AVSub is easy too! When browsing the cache, simple swipe right-to-left on item to reveal a delete button. See the AVSub website for details. AVSub supports Subsonic playlists and will intelligently cache tracks on your device. AVSub can be used on both WiFi or a mobile/cellular connection (3G/4G). Audio caching ensure smoother playback. AVSub shows enhanced information for your media, recognising movies, TV, artists and giving bio information, top tracks and similar artists. AVSub supports the casting app AVCast. With AVSub you can access your full media library by browsing, selecting from the most recently added, most recently played, most frequently played or highest rated tracks, or search over your entire library. AVSub also supports multiple SubSonic top-level music folders, allowing you to select an individual top-level folder, or your entire collection. You can browse by folder structure or ID3 tags. AVSub Features: - Universal app for iPhone/iPad/iPod Touch - MP3/AAC/FLAC/MP4/ALAC/Vorbis/Opus/WAV/DSD - High-resolution digital audio output via CCK up to 24bit/192kHz - CarPlay - TMDb integration for full movie & TV posters and details - VLC integration - Equaliser - Mini player - AVCast support - Google Cast & Amazon Fire TV audio and video (after in-app purchase) - Portrait and landscape - Video streaming with caching (in-app purchase) - Subsonic Jukebox (in-app purchase) - Home screen & Notification center widget with recent items - 3D Touch quick action shortcuts - Internet radio - Crossfade - SSL support, including self-signed certificates - Caching for all media - Folder & ID3 mode - Multi-disc album support - Artist Radio/Similar Songs - Intelligent Bookmarks - Podcasts - Gapless playback - Track seeking - Subsonic playlist support - Streams over 3G/4G/5G/WiFi - Maximum streaming bitrate control - Bluetooth Audio/Airplay support - Remembers your playlist from the last session - Streams from any licensed SubSonic server (v4.0 and up) - Browse/search music collection - Browse most recently added, recently played, frequently played, highest rated - Random albums/songs - Shuffle and repeat - Album cover art - Lock-screen integration - Documentation & guides available at the AVSub website - Supports iOS10+
Written user reviews are not shown here. Check current App Store reviews >
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.