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
Workout Live - Heart Rate Zone
Prop your iPhone on the treadmill, bike or rower and read your Apple Watch heart rate from across the room
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.1
83 ratings · Top 30%
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 Workout Live - Heart Rate Zone: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Prop your iPhone on the treadmill, bike or rower and read your Apple Watch heart rate from across the room. Huge numbers, color-coded zones, and a screen that never sleeps. WHAT YOU SEE - Live heart rate, calories, distance and elapsed time, streamed from your Apple Watch to your iPhone. - Color-coded heart rate zones: five colors from four thresholds you set yourself, so you know where you are without reading the number. - Time in each zone, building as you train, with the full breakdown waiting on your summary. - Your screen, your order: show, hide and reorder every section of the live view. - Start any workout with one tap from your watch face, or from your iPhone. - The iPhone screen stays awake for the whole workout. - 27 workout types, from HIIT, running and cycling to yoga, boxing, tennis and rowing. - Your units, your way: miles or kilometers; Calories, kilocalories or kilojoules; total or active energy. - Workouts are saved to Apple Health and appear in your Apple Fitness history. HOW IT WORKS - PLEASE READ BEFORE YOU BUY Workout Live records the workout itself. Start the workout in Workout Live on your Apple Watch, or from Workout Live on your iPhone, and keep Workout Live open on your iPhone to watch it live. Workout Live cannot display heart rate from other workout apps. If you start your workout in Apple's Workout app, Nike Run Club, Strava or anything else, Workout Live has no way to read it, because only one app at a time can own a workout session on Apple Watch. An Apple Watch paired to your iPhone is required. PRIVACY - No personal information is collected. - No ads, no tracking, no profiles. - No account and no sign-up. - Your data stays on your device and in Apple Health.
Written user reviews are not shown here. Check current App Store reviews >
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 the list of workouts to include more variety.
Assumption to check: Limited workout types available.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the UI during workout screens for better focus.
Assumption to check: User interface can be cluttered during workouts.
Validate with people who use this workflow before building.
Hypothesis 3
Improve integration with HealthKit and Google Fit for better data reliability.
Assumption to check: Inconsistent data syncing with health services.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce social features for users to connect and share progress.
Assumption to check: Lack of community features.
Validate with people who use this workflow before building.
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
Victory Native
Axios
React Navigation
Expo Permissions
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.
