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.
Simply Piano is a fast and fun way to learn piano, from beginner to pro
Free · 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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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 Simply Piano: Learn Piano Fast: 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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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 free content available
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Repetitive practice songs
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of community features
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.
Simply Piano is a fast and fun way to learn piano, from beginner to pro. Works with any piano or keyboard. Chosen as one of the best iPhone apps. - Tons of fun songs like Imagine, Chandelier, All Of Me and Counting Stars, also J.S. Bach - Includes courses for different musical tastes and playing levels - Learn the basics step-by-step from reading sheet music to playing with both hands - Slow down library songs to choose your own pace for easy learning - Personalized 5-Min Workouts ensuring you progress fast and always succeed - Suitable for all ages, no previous knowledge required to learn piano No Piano? Try the Touch Courses with 3D Touch to turn your device into an on-screen keyboard! How it works: - Place your device (iPhone/iPad/iPod) on your acoustic/MIDI piano or keyboard and play; the app will immediately recognize what you are playing - Get instant feedback on your playing to quickly learn and improve your piano skills - Discover the magic of music with fun songs in the Library and complete courses to start sounding like a pro How the Subscription Works: - All app users can play two free courses. Upgrade to a premium subscription package at any time. - Subscribers will receive full access to ALL courses. New courses and songs added every month! - All recurring subscriptions will auto-renew unless auto-renewal is turned off at least 24 hours before the end of the current period. - Account will be charged for renewal within 24-hours prior to the end of the current period, at the cost of the chosen package. - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. - Your subscription is for your iTunes account and can be used on your iOS device. - Payments will be charged to your iTunes account at confirmation of purchase. - Subscriptions cannot be cancelled during the active subscription period. Simply Piano is developed by Simply, creators of award-winning apps Simply Guitar, Simply Sing, Piano Maestro and Piano Dust Buster. Created by music educators, the apps are used by tens of thousands of music teachers worldwide with over 1 million songs learned every week. Simply are experts in creating educational and fun music apps for learning piano quickly and easily. Awards & Recognition - - ""EMI’s Innovation Challenge” - ""World Summit Award"", by the United Nations - “Best Tools for Beginners”, NAMM - ""Best Tablet Game"", GameIS - “Parents' Choice Award” - “Golden App”, Apps for Homeschooling Have questions, feedback or suggestions? Reach out to us via the in-app chat, just tap on Settings and ‘Have a Question’ Enjoy Playing! privacy policy: https://www.hellosimply.com/legal/privacy terms of use: https://www.hellosimply.com/legal/terms
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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.