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.
Remember when a music player was just that: a player? You would scroll the wheel, pick a song and listen
$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.
Queued for a daily kit update.
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 NostalgicPod: 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.
Remember when a music player was just that: a player? You would scroll the wheel, pick a song and listen. No algorithms deciding for you. No notifications. No endless feed. Just your music, in your pocket, NostalgicPod brings that feeling back, rebuilt from scratch for iPhone. A retro music player for your personal library, home media servers, internet radio and podcasts built in. The soul of a classic music player, with the engine of a serious modern app. ALL YOUR MUSIC, ONE WHEEL Bring your library from anywhere and play it all in one place. Import your own files through the Files app, iCloud Drive or whole folders — played in place, with no duplicates. Pull in the music already synced to your iPhone, songs and playlists included, with no subscription needed. Stream from your own server, Plex, Navidrome, Subsonic, OpenSubsonic, Jellyfin and Emby. Your old M3U playlists import automatically. THE SOUND Underneath the nostalgia is a serious audio player. FLAC lossless playback up to 24-bit/192 kHz with an automatic Hi-Res badge, gapless playback, and support for MP3, AAC, ALAC, FLAC, WAV, M4A, OGG and more. Server streams direct-play whenever possible, so lossless stays lossless. Shuffle with no unwanted repeats, plus Shuffle Albums for full records. Albums keep playing like the classics did: the last track flows into the next album. Plus star ratings and automatic playlists. YOUR LIBRARY, YOUR RULES One-time purchase. No subscriptions required for your own music, no in-app purchases, no account, no advertising, no tracking, no personal data collection. Your library stays on your device, and your own files play 100% offline. Pay once and keep it forever. You choose the music — NostalgicPod simply gives you a better way to enjoy it. MORE THAN A PLAYER Internet radio with stations from around the world. A full podcast player with RSS support and playback progress. A sleep timer. Classic games including Snake and Brick. Available in English, Spanish, Italian, German, French and Japanese. More games, audiobook support, CarPlay and additional customization are planned for future updates. Your music. Your device. Press play. NostalgicPod is not affiliated with or endorsed by Apple Inc. or any media server project. No account is required, and the app does not collect personal data.
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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 for music playback
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of personalized recommendations
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No social sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: User interface could be cluttered
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.
Not assessed in a Build Kit yet.
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.