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.
A wonderful player for your M4B/M4A/MP3/FLAC based audiobooks.
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 BookPlayer: map the core Books 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 audiobook selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inconsistent playback controls
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No offline listening options for all audiobooks
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.
A wonderful player for your M4B/M4A/MP3/FLAC based audiobooks. Import – Using AirDrop from your Mac or iOS device – From Files and other apps on your device – Via File Sharing in iTunes on your Mac or PC – From your own AudibookShelf or Jellyfin server – Zip files with your folders and books Manage – Maintain and see progress of your books – Mark books as finished – Drag & Drop to sort your library – Create playlists – Automatically play items in turn – Play the first unfinished file by tapping on the playlist artwork – Move files to playlists from the library or import them directly – Edit your book details (title, author, artwork) – Connect to your Hardcover.app account, and track your library progress Listen – Control audio playback from the lock screen, control center or from the companion app on the Apple Watch – Play and navigate books with Chapters – Jump to start of the current book – Change playback speed – Smart rewind – Volume Boost – Support for remote events from headset buttons and the lock screen – Sleep timer with adjustable duration – CarPlay support – VoiceOver support – Dolby Atmos support – Dark mode for night owls – Continue listening across your devices with Cloud Sync, including stand alone playback on your Apple Watch Supported M4B/M4A/MP3 BookPlayer is licensed under GNU General Public License v3.0. The source code and a list of all its contributors can be found on the GitHub page of this project at www.github.com/TortugaPower/BookPlayer You can see our Privacy policy and terms of use in the following links: – https://github.com/TortugaPower/BookPlayer/blob/main/PRIVACY_POLICY.md – https://github.com/TortugaPower/BookPlayer/blob/main/TERMS_CONDITIONS.md For help and ways to contribute to the project see the support section in the Settings screen of BookPlayer or visit www.bookplayer.app If you enjoy BookPlayer, we would be glad if you consider writing a review.
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.