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
HealthFace
Put any Health stat on your Apple Watch face, Home Screen and Lock Screen, and log new readings in a couple of taps.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
551 ratings · Top 15%
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 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 HealthFace: 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
Put any Health stat on your Apple Watch face, Home Screen and Lock Screen, and log new readings in a couple of taps. HealthFace turns your Health app data into watch complications and widgets, so the numbers you care about are always a glance away: steps, weight, blood glucose, blood pressure, water, caffeine, sleep and more than 100 other data types. ON YOUR WATCH FACE * Show any Health data on your Apple Watch face with complications * Display multiple data types on the same watch face * Show your progress towards a goal (e.g. 10,000 steps) * Tap a complication to record a new reading from your wrist * Preview your complications live on your iPhone before saving them to your watch ON YOUR IPHONE AND IPAD * Widgets for your Home Screen and Lock Screen * Record data from the iPhone, iPad or Apple Watch app in a couple of taps * Choose the data types you log most, so they're always close at hand * Create custom equations with mixed units, like a daily protein target from your body weight * Hundreds of high-quality icons to choose from * A native iPad layout designed for the bigger screen FOR EXAMPLE * Record your weight after stepping on the scales in the morning * Log your blood glucose or insulin if you're diabetic * Record your blood pressure * Track your caffeine, water or sugar, or any other dietary category YOUR HEALTH DATA STAYS YOURS HealthFace needs access to your Health data to work, but that data stays on your devices and is never sent anywhere. Read our privacy policy at https://healthface.app/privacy.html. Questions, suggestions or feedback? Email [email protected].
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
Incorporate voice input and quick logging features.
Assumption to check: Users often find tracking workouts and nutrition tedious.
Validate with people who use this workflow before building.
Hypothesis 2
Add social features like challenges and sharing achievements.
Assumption to check: Limited social sharing options compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance backend reliability and data syncing mechanisms.
Assumption to check: Some users report bugs with syncing data.
Validate with people who use this workflow before building.
Hypothesis 4
Create clearer explanations and incentives for premium features.
Assumption to check: Paywall can be confusing and limits access to 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
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Axios
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.
