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.
flowkey makes it fun and easy to play your favorite songs on piano – whether you’re a complete beginner or an experienced player
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 flowkey – Learn to Play Piano: 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 leading to user frustration
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Complex navigation between lessons and courses
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: Subscription model can be confusing
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.
flowkey makes it fun and easy to play your favorite songs on piano – whether you’re a complete beginner or an experienced player. All songs and courses are created by professional pianists, with interactive lessons, practice tools, and instant feedback to help you learn piano the way that works for you. Choose from thousands of beautifully-arranged piano pieces covering all genres, including: Classical, Pop, Film & TV and more. With songs available in four difficulty levels, you’ll always find new pieces to play. If you’re a beginner, learn piano step by step – with courses on how to read sheet music, navigate the keyboard, and play songs with both hands. flowkey’s beginner piano lessons are easy to follow and are a great way to learn piano fundamentals. Experienced piano players can sharpen their skills with in-depth tutorials covering scales, chords and improvisation. All you need to learn piano and play your favorite songs is the flowkey app, your device (phone, tablet or laptop), and an instrument. flowkey works with acoustic pianos, digital pianos, and keyboards. ALL YOU NEED TO LEARN PIANO & KEYBOARD flowkey’s interactive learning features make piano practice easy – and give you instant feedback on your playing. Loop: Choose specific sections to practice, and replay until you’ve perfected them. Select a Hand: Practice the right and left hand notes separately. Wait Mode: Follows as you play and waits for you to hit the right notes and chords. Works with your device’s microphone – or through Bluetooth/MIDI on digital pianos and keyboards. Video: Watch a professional piano player perform the song, see the next notes highlighted on the keyboard, and see how to place your fingers. Just Play: Perform the whole piece and Just Play keeps up with the score – even if you miss a few notes. Full Sheet Music View: If you’re using a tablet, turn it to portrait mode and practice reading traditional sheet music. TRY FLOWKEY FOR FREE Subscribe to the Yearly plan and the first 7 days are free – so you can explore the full piano song library, discover all courses and lessons, and learn how to use flowkey’s practice tools to master your favorite songs faster. Not ready to subscribe? A limited selection of beginner piano lessons and classical songs is available to learn for free. CHOOSE THE SUBSCRIPTION THAT SUITS YOU flowkey Premium - Includes all learning tools and courses - Access to the whole song library – including Classical, Pop, Rock, Film & TV and more. - Use flowkey on multiple devices flowkey Classic - Includes all learning tools and courses - Access to all classical and non-copyrighted songs - Use flowkey on multiple devices flowkey Family - Includes all learning tools and courses - Separate Premium accounts for up to 5 people on multiple devices - Access to the whole song library of digital sheet music BILLING OPTIONS Monthly: Stay flexible with monthly billing. Cancel anytime. Yearly: Save by subscribing to flowkey for 12 months. Includes a 7-day trial, which can be cancelled up to 24 hours before billing starts. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current subscription period. PEOPLE LOVE FLOWKEY With over 15 million people learning with flowkey worldwide, and 213,000+ 5-star reviews from happy pianists, keyboard players and piano teachers, we know flowkey’s fun approach to learning works. Ready to try it for yourself? WE’RE HERE TO HELP If you have any questions or feedback, you can reach us via email: [email protected] Or directly in the app by tapping: Settings -> Support & Feedback. FLOWKEY FOR TEACHERS If you’re a piano teacher or music tutor who’d like to use flowkey in lessons, or to support your students’ at-home practice, get in touch with the ‘flowkey for Teachers’ team at: [email protected] Terms of Service: https://www.flowkey.com/en/terms-of-service Privacy Policy: https://www.flowkey.com/en/privacy-policy
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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.