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.
Do you have an album collection of dozens to thousands of albums? Does the next song of an album already start playing in your head when one finishes? Longplay is for you.
$7.49 · 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.
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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 Longplay: 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 playback options.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of social sharing features.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No lyrics display while playing.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited discovery features.
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.
Do you have an album collection of dozens to thousands of albums? Does the next song of an album already start playing in your head when one finishes? Longplay is for you. Longplay presents a beautiful view of the album artworks of the (near) complete albums in your music collection. It let's you rediscover forgotten favorites or just play the music you love, and explore it with various smart sort options: - Orderliness: by artist, then by album - Addiction: by amount of time spent listening - Brightness: by the primary color of the album artwork - Negligence: by the time it’s been since you’ve last listened to the album, weighted by the rating - Recency: by date added - Memory: by last played - Stars: by the rating you’ve provided for each song - Random: a new order, every time you tap it You can organize your albums into collections, which sync across your devices. Infinite album shuffle let's you stay in the flow, with smart shuffle depending on your current collection or sort order. It comes with a home screen widget that displays the top albums by your nominated sort order. On the larger widget, tap an album to play it, on the smallest it doubles as a "Feeling lucky" button to start playback of one of them. It supports CarPlay, Siri, Shortcuts, and Spotlight.t supports CarPlay, Siri, and Shortcuts. It works well with Apple Music, music purchased from iTunes or synced manually. --- Important: Longplay does not ship with any music included, it is instead a player for your music library - be it from Apple Music, iTunes or your synced music. It provides a filtered view of just the albums of which you have all or most of the songs, as well as your playlists; thus focusing on your album collection without any singles or albums where you only have very few songs. --- Tap an item to play (or pause). Long tap for additional options, such as adding to your album queue or to a collection. It works with libraries big and small, and besides regular albums it also handles compilation albums and playlists. Comes with Shortcuts actions to play a random top album by a defined sort order, or a random album, optionally filtered by artist or genre. All of that with Longplay's logic that makes sure that it's an album for which you have all or most songs. It is compatible with iPhone, iPad and iPod Touch. Fully VoiceOver accessible.
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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.