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
HeartSnap:Health Tracker
HeartSnap – Heart Rate, Blood Pressure & Health Tracker
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
4,144 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.
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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 included17 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 HeartSnap:Health Tracker: 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
Implement more robust data capture and syncing with health devices.
Assumption to check: Users report that tracking features can be unreliable.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce customizable health goals and reminders.
Assumption to check: Limited customization options for health goals.
Validate with people who use this workflow before building.
Hypothesis 3
Focus on clean, minimalistic UI design and better organization of features.
Assumption to check: Some users find the interface cluttered.
Validate with people who use this workflow before building.
Hypothesis 4
Add community challenges and leaderboards for motivation.
Assumption to check: Lack of social features for engagement.
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
HeartSnap – Heart Rate, Blood Pressure & Health Tracker Your All-In-One Partner for Heart, Blood Sugar & Mental Wellness Your health shouldn’t be a mystery. HeartSnap empowers you to measure your heart rate via your phone and seamlessly log blood pressure, blood sugar, HRV, and mental wellness. We transform your raw data into clear, actionable insights, helping you understand your body with absolute confidence. Why Choose HeartSnap? Instant Heart Rate Monitoring: Measure your pulse using your iPhone camera with PPG-based detection. Get immediate insights into heart rate, HRV, and stress patterns to better track your cardiovascular status anytime, anywhere. HeartSnap also uses AI to help you understand your heart score. Comprehensive Blood Pressure Tracker: Record systolic and diastolic readings to monitor long-term trends. Keep your logs organized for personal reference or for easy sharing with your healthcare provider. Blood Sugar Logging Made Simple: Easily log daily glucose levels and track long-term trends with intuitive charts. See how your patterns change over time and maintain consistent records to support healthier daily habits. AI-Powered Heart Age Check: Discover your estimated heart age through a simple questionnaire and a quick heart-rate scan. HeartSnap uses AI to analyze your patterns and generate a Heart Age Score, helping you visualize your overall wellness. Mental Wellness Assessments: Take self-assessment questionnaires regarding mood, stress, sleep, and anxiety. HeartSnap provides general wellness insights to help you better understand and manage your emotional well-being. BMI & Weight Tracking: Automatically calculate your BMI and log weight changes over time. Track long-term trends through clear charts, helping you stay aware of body changes and maintain a healthier lifestyle. Stress Level Check: Complete a simple questionnaire to gain an estimated view of your current stress. Receive general wellness suggestions to support relaxation, emotional balance, and healthier habits. HRV (Heart Rate Variability) Insights: Track HRV trends to understand how your body responds to daily activity and rest. HeartSnap presents your data in easy-to-read charts for better wellness awareness. Insightful Reports & Health Trends: View clear health trends at a glance. Track changes in vitals, BMI, and mood through intuitive charts—helping you spot risks early and gain meaningful health insights. Download HeartSnap — your complete health monitoring companion. SUBSCRIPTION TERMS Unlock full access with HeartSnap Premium. Subscription Plans: Weekly Plan: $9.99 / week Annual Plan: $39.99 / year Subscription: Payment is charged to your Apple ID at purchase. Subscription renews automatically unless canceled at least 24 hours before the end of the current period. DISCLAIMER HeartSnap is for wellness only and not a medical device. It does not provide medical diagnosis or treatment. Blood pressure and blood sugar must be entered manually. Heart rate and HRV are wellness estimates. This app is not a substitute for medical advice; consult a healthcare professional for any concerns. Required Policy Links Privacy Policy: https://ilovescanqr.com/heartsnap/privacy Terms of Use: https://ilovescanqr.com/heartsnap/terms Subscription Policy: https://ilovescanqr.com/heartsnap/subscription
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
react-native-reanimated
expo-haptics
react-navigation
BUILD KIT DIFFICULTY
Advanced
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.
