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.
I Love a Piano is a musician's best friend, offering the utility of a piano in an iPhone app that's fast, intuitive, and fun.
$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 I Love a Piano: 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 song selection compared to competition
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of personalized learning paths
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No offline access to lessons
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.
I Love a Piano is a musician's best friend, offering the utility of a piano in an iPhone app that's fast, intuitive, and fun. I Love a Piano features 88 haptic keys playable by tap or glissando (sliding), with five vibrant instrument sounds, 10 brilliant colors, and sharp, natural, or flat labels for players of all levels. These features come together in the original MultiPiano design: a scrollable stack of layered keyboards that transitions smoothly between portrait and landscape orientations. I Love a Piano also features specialized Apple Music controls so you can learn and play along with your music library, without leaving the keys. INSTRUMENT SOUNDS • Acoustic Piano • Electric Piano • Drawbar Organ • Sine Wave • Music Box (Glockenspiel) MULTIPIANO • 88 slideable, tappable, haptic keys • Three key sizes: Small, Medium, Large • Four label styles: Sharps, Flats, Naturals, None • Octave number badges • Middle C indicator • 9 brilliant colors + one wooden texture • Natural-scrolling scrollbars above every keyboard • Haptic + visual (illumination) scrolling feedback • Octave (8-key)-based navigation controls • Compact alignment options for greater one-handed playing • Bottom alignment option • Two-finger tap-to-sustain • Double-tap scrollbars for scroll lock • Inverted key color option MUSIC CONTROLS • Toolbar miniplayer with haptic scrubbing • Play, pause, skip forward/back • 5-second rewind for looping phrases • Slo-mo (70% speed) for learning by ear • Repeat one (always on in slo-mo) • "Lower music" toggle, to mix music in background • Apple Music library browser • Expanded "Now Playing" sheet with full-size artwork • Basic play/pause support for external audio and picture-in-picture video • Toolbar volume menu with separate music and instrument settings MULTIMEDIA • Screen recording that saves to Photos library ACCESSIBILITY • VoiceOver with spoken and musical feedback • VoiceOver "Adjustable" navigation method: • Swipe up/down on keyboard to move focus a half step; double-tap to play • Swipe up/down on scrollbars to move one octave left/right • Alternative "scrub" method: swipe or drag sideways to change focus • Dark mode support REQUIREMENTS I Love a Piano Version 1.0 requires iOS 18 or later. I Love a Piano is guided by the principles that the best technologies are tools made for people, and that access to a piano can change someone's life. Play with it. Mess with it. Make music with it.
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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.