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.
Join over 14 million music lovers discovering piano
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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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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 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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Join over 14 million music lovers discovering piano. Learn the fun and easy way, no lessons needed. Play songs, practice piano, and create music in one intuitive app. Choose how you play: follow the rhythm in interactive gameplay to build timing and confidence, or switch to a realistic keyboard to explore chords, melodies, and your own musical ideas. With Piano, you can jump right in. Play to the rhythm, explore notes and chords, and create music at your own pace. Designed for iOS (iPhone & iPad), Piano offers a smooth, responsive playing experience with intuitive touch controls, clean visuals, and a simple layout. Perfect for beginners, casual players, and anyone who wants to enjoy piano practice without pressure. Discover piano through interactive gameplay, creative tools, and realistic instrument sounds. Play classical piano favorites like Für Elise Clair de Lune and Moonlight Sonata Learn timeless works like Canon in D Ode to Joy and The Entertainer Discover expressive piano pieces like Gymnopédie No 1 and Nocturne Enjoy traditional songs like The Star Spangled Banner Amazing Grace and Yankee Doodle Choose Your Mode - Rhythm Play: Interactive gameplay to build timing, coordination, and confidence. - Freestyle Keyboard: A realistic instrument experience for practicing chords, melodies, and musical ideas. Both modes are powerful practice tools, helping you focus on rhythm, control, and musical expression. What You Can Do Play to the rhythm Follow timing cues, play step by step, and learn how songs come together. Freestyle Keyboard Use a full piano keyboard with real notes & chords, ideal for practicing, exploration, or composing your own melodies freely. Responsive Touch Keys Enjoy smooth, accurate playing with touch-sensitive keys built for a great iOS experience. Create, Record & Share Go beyond practicing; turn your ideas into real music. Record your performances, capture your progress, and share your journey with friends and a global community of players. Multiple Instruments Play grand piano, electric keys, xylophone, and more. A wide range of authentic sounds. Progress as You Play Unlock songs, earn rewards, and move from simple tunes to more advanced arrangements. Explore Every Genre Play classical masterpieces, pop hits, jazz, kids' songs, film themes, and more. Enjoy music from Mozart, Beethoven, Chopin, Tchaikovsky, Vivaldi, Bach, Strauss, and Verdi, alongside modern favorites like Bella Ciao and Twinkle Twinkle. Search, browse, and jump into any song you want to play. Piano Pro Upgrade to unlock the full experience: • Unlimited songs to play • Multiple instrument sounds • Ad-free practice • Record with perfect timing Your subscription renews automatically unless canceled at least 24 hours before renewal. Manage subscriptions in your App Store settings. Terms & Privacy: https://impalastudios.com/terms | https://impalastudios.com/privacy Feedback & Support We'd love to hear from you: [email protected] Join a global community of millions of players who practice, create, and share music every day. Piano is a go-to app for learning, playing, and performing music - trusted and loved worldwide. About Impala Studios Impala Studios creates popular apps designed to make everyday life more fun and enjoyable. From music and games to productivity tools, our apps are built for iPhone and iPad users around the world. With Piano, we bring millions of music lovers together to play, learn, and share songs every day. Piano © 2016 Impala Studios
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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 competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inconsistent audio playback quality.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of social features for sharing progress.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Some lessons may feel repetitive.
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.
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.