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
HeartyPro: Heart Rate & Stress
AI-Powered Ultimate ALL-IN-ONE Health Companion：Pulse Detect, AI Analysis, BP Track...
$29.99 · In-app purchases
PRICE
$29.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
166 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 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 HeartyPro: Heart Rate & Stress: 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 calibration options and integrate additional sensors.
Assumption to check: Users often find heart rate measurements inaccurate.
Validate with people who use this workflow before building.
Hypothesis 2
Add guided exercises, meditation, and personalized stress relief plans.
Assumption to check: Limited stress management features.
Validate with people who use this workflow before building.
Hypothesis 3
Clarify value of premium features and simplify the subscription process.
Assumption to check: Subscription model can be confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize performance and reduce app load times.
Assumption to check: App can be slow on older devices.
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
AI-Powered Ultimate ALL-IN-ONE Health Companion：Pulse Detect, AI Analysis, BP Track... • Hearty AI – Analyze your health with DeepSeek-R1/Gemini/Grok • Camera Pulse Measurement, no extra devices. • Blood Pressure Tracking • Visual Insights: 80+ charts for 40+ body metrics • Psychological stress analysis. • Track hydration and caffeine intake. • Apple Integration – HealthKit, Apple Watch, widgets, AI Health Analysis, Redefined Hearty isn’t just another tracker. With Hearty AI, we turn raw data into smart, personalized insights using cutting-edge large language models. Discover trends, catch early signs, and gain clarity on your health journey—right from your iPhone and Apple Watch. Seamlessly integrates with Apple Health to analyze key metrics like heart rate, HRV, sleep, blood pressure, and activity. Visualized through intuitive charts that help you focus on what matters most: your well-being. Privacy First. Always. Hearty uses HealthKit to access health data on your device. All insights are for informational purposes and do not replace medical advice. If you have health concerns, always consult a medical professional. Terms & Privacy EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: http://heartytech.net/privacy-policy
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
Victory Native
@react-navigation/native
expo-sensors
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.
