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-Gnome
MetroGnome - Metronome & Drone Tones
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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.
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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 included15 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-Gnome: 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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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 a wider variety of click sounds, including customizable options.
Assumption to check: Limited sound options for metronome
Validate with people who use this workflow before building.
Hypothesis 2
Integrate practice sharing and community challenges to enhance engagement.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 3
Implement offline mode for practice sessions without internet access.
Assumption to check: No offline capability
Validate with people who use this workflow before building.
Hypothesis 4
Provide a more comprehensive feedback system with ratings and comments.
Assumption to check: Minimal user feedback options
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
MetroGnome - Metronome & Drone Tones Perfect your timing and intonation with MetroGnome, the elegant metronome and drone tone generator designed for musicians of all levels. METRONOME FEATURES: • Precise tempo control from 30 to 300 BPM with easy increment buttons and smooth slider • Visual beat indicators with optional flashing for silent practice • Customizable time signatures from 1 to 8 beats per measure • Multiple subdivision options: quarter notes, eighths, triplets, sixteenths, and more • Tap tempo function for quick tempo matching • Save your favorite tempos with quick-access presets • Classical tempo markings (Largo, Andante, Allegro, Presto, etc.) displayed automatically • Mute option for visual-only practice DRONE TONES: • High-quality drone tone generator for pitch practice and intonation training • All 12 chromatic pitches available (C through B) • Perfect for vocalists, string players, and wind instruments • Runs independently or alongside the metronome BEAUTIFUL DESIGN: • Stunning rainbow gradient theme with translucent glass-like controls • Clean, intuitive interface optimized for one-handed use • Large, easily tappable controls for stage and practice room use • No scrolling required - everything visible at a glance PERFECT FOR: • Practice sessions • Music students and teachers • Live performances • Ensemble rehearsals • Ear training and intonation work Download MetroGnome today and take your musicianship to the next level!
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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
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React Navigation
@react-native-async-storage/async-storage
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.
