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
Artie: Learn Piano with AI
Even if you’ve never touched a piano before, you can start playing the songs you love.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
1,469 ratings · Top 15%
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 included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Artie: Learn Piano with AI: map the core Education 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 advanced lessons or customizable learning paths.
Assumption to check: Users may find some lessons too basic or unchallenging.
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline downloads for lessons and practice sessions.
Assumption to check: Limited offline functionality for lessons.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce more subtle reminders for premium features.
Assumption to check: In-app purchase prompts may be intrusive.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance progress dashboard with visual analytics and feedback.
Assumption to check: Progress tracking could be more detailed.
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
Even if you’ve never touched a piano before, you can start playing the songs you love. Browse a library of more than a hundred hand-picked tracks—from chart hits and movie themes to timeless classics and kids’ favorites. PLAY · LEARN · IMPROVE · Real-time feedback. Artie listens as you play and gives instant, practical tips to improve your rhythm and accuracy. · Beginner-friendly levels. Easy, Medium, and Hard—designed for newcomers by Grammy-winning musicians. · Flexible practice tools. Loop tricky parts, slow down the tempo, and practice with playback for one or both hands. · Compatible with any piano. Works with any keyboard or piano, acoustic or digital. · Track your progress. Follow a personalized plan, keep a weekly practice streak (10 minutes, 3 times a week), and unlock rewards after 8 weeks. Created by the musicians behind a Prague music school with over 20,000 online students worldwide, Artie blends the warmth of human teaching with the power of AI.
Written user reviews are not shown here. Check current App Store reviews >
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
react-navigation
expo-av
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.
