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.
Violin Note Finder is a tool that will help you with sight reading
$0.99 · 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.
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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 Violin Note Finder: 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 functionality for advanced users
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: In-app purchase for full features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No social sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of visual aids
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.
Violin Note Finder is a tool that will help you with sight reading. It will give you the insight to find notes on the whole fingerboard of your instrument. This app was built by a small team of professional music teachers from the Netherlands. The functionality is very straightforward: You can tap on a staff to see where on the violin a certain note can be played. You will see this both on an overview picture of a violin in the middle of the screen, and on a picture of an enlarged position of the violin. You can select which position to be enlarged by using red arrows. If you tap on this enlarged position, the corresponding note will appear on the staff, and you will see on the overview picture where that same note also can be played. The left hand finger numbers are shown just above the enlarged position. Both by tapping on the staff and on the enlarged fretboard, you will hear te corresponding tone, and the name of the note will appear on the left side of the staff. Lastly, you can set the notes on the staff to be sharp or flat, or back to natural.
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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.