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
MetroBPM
Need a tempo tune-up for your live performance? Need to play for dance and keep the pace steady? MetroBPM combines a Live Tempo Detector with a Metronome in your pocket
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
5 ratings · Top 5%
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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 MetroBPM: 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
Offer more sound packs and customization options.
Assumption to check: Limited sound options compared to other metronome apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement a visual metronome indicator.
Assumption to check: No visual feedback during playback
Validate with people who use this workflow before building.
Hypothesis 3
Provide better onboarding to explain in-app purchases.
Assumption to check: In-app purchase functionality may be unclear
Validate with people who use this workflow before building.
Hypothesis 4
Introduce social sharing to showcase settings or achievements.
Assumption to check: Lack of social sharing features
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
Need a tempo tune-up for your live performance? Need to play for dance and keep the pace steady? MetroBPM combines a Live Tempo Detector with a Metronome in your pocket. It uses your device's microphone to detect tempo from percussive/rhythmic music in Real-Time. Designed for learners, enthusiasts, and performers. - Features - • Real-time detection of tempo from rhythmic music • Tempo history plot for review • Metronome with selectable sounds and visualization • Tap-to-detect tempo • Quickly launch frequently used tempo by tap-hold app icon • No Ads or Subscription - Modern Design - • Optimized for live on-stage use on iPhone and iPad • Dark mode for low-power usage on OLED displays • Live Activity & Dynamic Island Support (monitor and control from Home Screen, Lock Screen and supported Watch OS) Note: Tempo detection is currently optimized for rhythmic / percussive music in quadruple, 6/8 time signatures, performance may vary. Works best with live music in low background noise.
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
Redux
React Native Animatable
React Native Sound
BUILD KIT DIFFICULTY
Advanced
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.
