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
HRV Watch - Stress Watch
HRV Watch helps you understand stress, heart rate, and recovery trends more intuitively—using Apple Watch and data from the Health app.
$0.99 · In-app purchases
PRICE
$0.99
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.
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's included16 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 HRV Watch - Stress Watch: 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
Add more detailed analytics and insights for users.
Assumption to check: Limited features for tracking and analyzing HRV data.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social features for users to share progress.
Assumption to check: No social sharing options.
Validate with people who use this workflow before building.
Hypothesis 3
Implement customizable alerts for measurements.
Assumption to check: Lack of customization for notifications and reminders.
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
HRV Watch helps you understand stress, heart rate, and recovery trends more intuitively—using Apple Watch and data from the Health app. Key features: - HRV trends: Track HRV (SDNN) over time to see how your body is recovering - Heart rate: Current heart rate, resting heart rate, and historical trends - Stress insights: Estimates stress from HRV, heart rate, and related signals; includes a yearly stress heatmap for long-term patterns - Custom stress display: Beyond the default color ring, choose from 16 cute hand-drawn theme icon sets (animals, plants, spooks, jelly, and more) that change across four tiers—Relaxed, Normal, Moderate, High; optional custom tier labels - Steps & sleep: Daily activity and sleep data to help you see the bigger picture - Apple Watch: Quick access to key metrics on your wrist; theme syncs from iPhone - Widgets & complications: Stress, steps, heart rate, and more on your watch face; rectangular stress complications show theme icons when a custom theme is selected - Languages: English and Simplified Chinese - Home: Cards or flat layout with customizable visible items, order, and optional header gradient - Trends: Dedicated sections per metric; flat by default, cards optional - 28 hand-drawn stress themes including new cartoon animal breeds; synced to Apple Watch and widgets HRV Watch reads only the Health data you authorize and analyzes it on your device. It does not replace professional medical advice; all results are for everyday reference only. Who it’s for: - Anyone tracking stress day to day - People who care about HRV and recovery - Apple Watch users who want a simple health dashboard - Users who prefer visual themes or heatmaps for stress Important disclaimer: HRV Watch is for general wellness purposes only and is not a medical device. All data, estimates, and insights are for informational use only and are not intended to diagnose, treat, cure, or prevent any disease or condition. Consult a qualified healthcare professional before making health-related decisions.
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-chart-kit
axios
redux
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.
