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
StrobeTuner - Chromatic Tuner
A studio-grade chromatic strobe tuner designed for iPhone and Apple Watch
$2.99 · In-app purchases
PRICE
$2.99
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.
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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/
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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 StrobeTuner - Chromatic Tuner: 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
Expand tuning modes to include more instruments and custom tunings.
Assumption to check: Limited tuning modes (only a few instrument types)
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline tuning capabilities.
Assumption to check: Lack of offline functionality
Validate with people who use this workflow before building.
Hypothesis 3
Add visual indicators or animations to show pitch accuracy.
Assumption to check: No visual feedback for pitch accuracy
Validate with people who use this workflow before building.
Hypothesis 4
Offer a free trial for premium features before purchase.
Assumption to check: In-app purchase for extra features without trial
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
A studio-grade chromatic strobe tuner designed for iPhone and Apple Watch. Fast, accurate, and beautifully simple. STROBE VISUALIZATION StrobeTuner brings you classic strobe visualization in a simple tuner app. Concentric rings spin when you're sharp or flat and freeze when you're perfectly in tune, giving you real-time visual feedback that's more precise and intuitive. Play a note and see it lock in immediately. Ultra-low latency pitch detection means there's no waiting and no lag. iPHONE, iPAD + APPLE WATCH Tune from your wrist or from your pocket. Same precision on all devices. The Apple Watch app works independently, no iPhone required. Perfect for quick checks in the practice room. WORKS WITH ANY INSTRUMENT Guitar, uke, bass, piano, violin, mandolin, sax, trumpet, brass, clarinet, flute, woodwinds — if it has a pitch, StrobeTuner hears it. ADJUSTABLE REFERENCE PITCH + PRESETS Default is A4 = 440 Hz. Adjust to whatever your ensemble requires. Handy presets like 432 Hz and 442 Hz available at the tap of a button. CLEAN & MINIMAL No clutter, no ads, no accounts, no data collection. Audio is processed entirely on-device. Just open it and tune. PERSONALIZE YOUR STYLE Change the strobe ring color to suit your style, and choose whether notes display as sharps or flats. Adjust strobe speed and direction. ADVANCED SETTINGS Flip one switch for finer control. Dial in mic sensitivity separately for iPhone and Apple Watch to suit loud stages or quiet rooms. Set your own strobe speed. Unlock four multi-color ring palettes: Rainbow, Neon, Aurora, and Grayscale. It's off by default, so the app can stay minimal.
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
react-native-svg
@react-native-community/slider
Zustand
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.
