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.
App Overview
Perfect Piano - Learn to Play
Perfect Piano is an intelligent piano simulator design for your iPhone and iPad
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
7,717 ratings · Top 30%
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Perfect Piano - Learn to Play: 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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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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
Offer more free lessons or a better trial experience.
Assumption to check: Limited free content, leading to user frustration.
Validate with people who use this workflow before building.
Hypothesis 2
Enhance audio processing for better sound fidelity.
Assumption to check: Inconsistent audio playback quality.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a more comprehensive progress tracker.
Assumption to check: Difficulty in tracking progress across different lessons.
Validate with people who use this workflow before building.
Hypothesis 4
Provide an ad-free subscription tier for uninterrupted learning.
Assumption to check: Ads can interrupt learning flow.
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Perfect Piano is an intelligent piano simulator design for your iPhone and iPad. With in-built genuine piano timbre, this app can teach you how to play piano and amuse you at the same time! [ Smart Keyboard ] • 88-key piano keyboard • Single-row mode; Double-row mode; Double players • Multitouch screen support • Force touch • Keyboard width adjustment • Multiple in-built sound effect: Grand piano, Music box, Pipe organ, Synth bass, Steel string guitar, Strings Ensemble, Soprano Sax, Space Synth, Rhodes Piano • MIDI and AAC audio recording • Metronome • Direct sharing of recording file or set as ringtone [ Learn to Play ] • Learn thousands of popular music scores • Two guidance patterns: falling note, waterfall • Three play modes: auto play, semi-auto play, note pause • Left & right hand setup • A->B loop • Speed adjustment • Difficulty adjustment [ Multiplayer Connection & PK ] • Play the piano with other players from all over the world • Make friends • Real-time on-line chatting • Weekly new song challenge ranking • Create guilds [ Support USB MIDI Keyboard ] • Support standard General MIDI protocol and allow the connection of MIDI keyboard (such as YAMAHA P105, Roland F-120, Xkey, etc.) through USB interface • Perfectly control the piano, play, recording and competition via external MIDI keyboard [ MusicXML notation ] • Support MIDI and MusicXML notation. If you have any question regarding the use of app, please contact us: • Email: [email protected] Let's rock and roll! Terms of use: http://www.revontuletsoft.com/terms_perfectpiano.html Privacy Policy: http://www.revontuletsoft.com/privacy_perfectpiano.html Thanks for using Perfect Piano!
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Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
axios
expo-av
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BUILD KIT DIFFICULTY
Advanced
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.
