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.
Take your grand piano with you anywhere
$2.99 · 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 Real 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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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 instrument selection
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No social features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Inconsistent audio quality
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of tutorials
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.
Take your grand piano with you anywhere. Glide across all 88 keys. Customize your key labels. Tune and transpose your piano with ease. Record and share music with friends. View real-time score notations and control various settings with Real Piano Remote, a separate app that can be downloaded for free. Real Piano produces authentic grand piano sound quality that was sampled from a real grand piano. It also plays guitar, bass, harp, marimba and music box. The full length of the 88-key keyboard is accessible during play with touch-to-slide and pinch-to-stretch functionality. The huge feature set offers something for everyone – amateurs, professionals, songwriters, teachers and students. FEATURES • Realistic instruments, including grand piano, guitar, bass, harp, marimba and music box. • Full 88-key keyboard that you can smoothly slide and pinch to move and zoom during play. • Dynamic expression controls, including position-based or tap-force detection. • Different keyboard layouts and customizable key labels: C-D-E, 1-2-3 or do-re-mi. • Various professional tuning and transposition tools. • Audio effects support for unique sound production. • Recording and sharing via e-mail, Facebook, SoundCloud or iTunes. • Game Center achievement integration – earn usage and skills-based achievements. • Display touch points when connected to an external screen or projector. • Connect with the Real Piano Remote app for remote control on a secondary device. With Real Piano Remote, you can see the notation of what you are playing in real time, quickly and easily adjust a variety of settings from a separate screen, and even use your secondary device as a sustain pedal (touch with your hand or foot). Real Piano and Real Piano Remote must be running on separate iOS devices connected to the same Wi-Fi network or via Bluetooth.
Written user reviews are not shown here. Check current App Store reviews >
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.