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.
Make a melody with a line.
$0.99
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.
Your first Build Kit is free with a verified email.
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.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Make a melody with a line. Play Music turns your drawings into looping music on iPhone and iPad. Draw from left to right through time, draw higher for higher notes, and choose a color to change instruments. Press Play, then keep drawing or erase a line to hear your composition change. DRAW, LISTEN, EXPLORE Create with nine synthesized instruments: keys, pluck, bell, marimba, flute, strings, chime, bass, and 8-bit tones. Switch between Draw and Pixel for two visual views of the same music. START WITH A DRAWING Explore ten original illustrated drawings, from a mountain village and a lighthouse to a whale among stars and a rainy-day cafe. Every line is editable, and every sound comes from the actual drawing. Tap Random to discover twenty simple drawings that play familiar melody excerpts. English guidance explains the melody and how to recreate its shapes, helping you explore pitch, duration, and spacing. SHAPE YOUR SOUND Add bass, drums, and arpeggios independently or together. Adjust tempo, key, major or minor scales, loop length, and rhythm. Try pentatonic or diatonic scales, change your instrument colors, and experiment with the built-in keyboard. MAKE IT YOUR OWN Choose Light or Dark appearance. Set the canvas against the panel, sky, or a photo you select. Use the eraser, undo, and redo as you explore. Your current draft saves automatically, and the local Library keeps multiple projects ready to revisit. SHARE WHAT YOU MAKE Export one complete loop as an MP4 music video, WAV audio, or multitrack MIDI file. Use the system share sheet to save or share your creation. MIDI contains musical notes and uses the instruments in your other music app, so its sound may differ from Play Music. CREATE OFFLINE Drawing, playback, saving, and export work on your device. No account or internet connection is required, and the app does not automatically upload your drawings or background photos. Play Music has no advertisements or third-party analytics. Play Music is available in English.
Written user reviews are not shown here. Check current App Store reviews >
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.
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.