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.
App Overview
Metro: Modern Metronome
Metro is the ultimate metronome app for musicians of all levels
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
15 ratings · Top 15%
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Metro: Modern Metronome: 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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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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
Include a wider variety of sound packs and user-uploaded sounds.
Assumption to check: Limited sound options for the metronome.
Validate with people who use this workflow before building.
Hypothesis 2
Implement more dynamic visual feedback for better user experience.
Assumption to check: Lack of visual indicators during use.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to download sounds and use them offline.
Assumption to check: No offline functionality.
Validate with people who use this workflow before building.
Hypothesis 4
Clarify pricing and benefits of in-app purchases in the app interface.
Assumption to check: In-app purchase confusion.
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Metro is the ultimate metronome app for musicians of all levels. With its powerful features and intuitive interface, Metro makes it easy to stay in time while you practice or perform. Features: - 3 note types: Accent, standard, and ghost notes. - Customizable sounds: Choose from dozens of unique sounds for each note type. - Color-coded metronomes: Easily keep track of multiple metronomes at once. - Up to 12 metronomes: Play multiple metronomes at the same time to practice polyrhythms and add depth + richness to your sound. - Drone: Play a drone of notes within a given key, major or minor. - Supports tapping to set the tempo of the metronome. Also supports inputting tempo with keyboard or by sliding right/left to change. - Save configurations and toggle between them so you can practice different songs, styles, and exercises with the perfect setup. Ideal for: Musicians who want a powerful and easy-to-use metronome. String players who need a reference drone to stay in tune. Anyone who wants to improve their timing and rhythm. Download Metro today and start playing in time and in tune!
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
React Navigation
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expo-av
BUILD KIT DIFFICULTY
Intermediate
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.
