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
Cadence Trainer Pro: Metronome
Train your stride, stay in rhythm, and run smarter - now with total privacy.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 Cadence Trainer Pro: Metronome: map the core Health & Fitness 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 customizable tempo ranges and presets.
Assumption to check: Limited tempo range compared to other metronome apps
Validate with people who use this workflow before building.
Hypothesis 2
Add features for creating and saving custom rhythms.
Assumption to check: Lack of advanced rhythm patterns
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate a visual metronome with animations for each beat.
Assumption to check: No visual feedback for beat subdivision
Validate with people who use this workflow before building.
Hypothesis 4
Offer a wider variety of sound samples and customization for users.
Assumption to check: Basic sound 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
Train your stride, stay in rhythm, and run smarter - now with total privacy. Cadence Trainer Pro is the premium version of the popular Cadence Trainer app, designed to help runners improve cadence, boost performance, and reduce injury risk through simple, effective rhythm training. Run to the beat Set your target cadence and run to a clean, adjustable click track that keeps your stride smooth and consistent. No clutter, no distractions - just rhythm. Why Pro? - No data collection or analytics - No ads or subscriptions - Works alongside Strava and other fitness apps - Lightweight, battery-friendly, and offline-ready Ideal for runners who value focus and privacy, or anyone who prefers a one-time purchase with no ongoing costs. Features - Customizable metronome tempo for running cadence - Simple, intuitive interface - Works in the background with other fitness apps - Audio cues to help maintain your stride rate Monitor progress with the inbuilt graph 100% private - no tracking or data collection Why cadence training matters A steady cadence helps reduce overstriding, lower impact stress, and make your runs more efficient and comfortable. Cadence Trainer Pro makes it effortless to find and lock into your rhythm. Learn more For tips, support, and updates, visit https://cadencetrainer.com
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/native
react-native-reanimated
expo-av
react-native-slider
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.
