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
HealthFace is the best app for tracking and recording Health data on iPhone, iPad, and Apple Watch.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
545 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.
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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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.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
HealthFace is the best app for tracking and recording Health data on iPhone, iPad, and Apple Watch. * Record data quickly via the iPhone app or Apple Watch app * Display your Health data in beautiful widgets on your Home Screen and Lock Screen * Show any Health data on the Apple Watch clock face using complications * Customize the types of data you want to record so you can input data in only a couple of taps * Tap on any complication to quickly record data * Supports all types of data from the Health app * Create custom equations with mixed units — like calculating your daily protein target from your body weight * Native iPad support with a layout designed for the bigger screen For example: * Quickly record your weight after standing on your scales in the morning * If you're diabetic you can quickly record your blood glucose or insulin intake * Quickly record your blood pressure * Quickly record your caffeine, water or sugar intake, or any of the other dietary categories HealthFace widgets let you see your health data at a glance — right on your Home Screen, Lock Screen, or Apple Watch face. * Ability to display a goal (e.g. show your progress towards 10,000 steps) * Real-time preview on your iPhone before saving to your Apple Watch * 82 data types from the Health app * Display multiple data types on the same watch face * Hundreds of high quality icons to choose from If you have any questions, suggestions or other feedback, please email [email protected], or tweet us @HealthFaceApp. ABOUT HEALTH DATA: We take your privacy very seriously. Although HealthFace needs to access your Health data in order to function as advertised, your Health data remains on your iPhone and Apple Watch at all times and is never transmitted anywhere. All data is accessed in full accordance with the iOS app review rules set by Apple. Please read our privacy policy at https://healthface.app/privacy.html for more information on our use of data. You can contact us at [email protected] if you have any questions or concerns.
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
Supabase
TypeScript
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.
