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
Hearty - Heart Health Monitor
Join users on the journey to better manage heart disease and discover how tracking symptoms can make a big difference in becoming happier and healthier.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
5 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's included15 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 Hearty - Heart Health Monitor: map the core Medical 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 gamification elements like badges for consistent tracking.
Assumption to check: Limited user engagement features, leading to poor long-term usage.
Validate with people who use this workflow before building.
Hypothesis 2
Provide educational resources and articles on heart health topics.
Assumption to check: Lack of educational content about heart health.
Validate with people who use this workflow before building.
Hypothesis 3
Create a community forum within the app for users to connect.
Assumption to check: No community support for users to share experiences.
Validate with people who use this workflow before building.
Hypothesis 4
Use AI to generate personalized health insights based on user data.
Assumption to check: Basic analytics with no personalized insights.
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
Join users on the journey to better manage heart disease and discover how tracking symptoms can make a big difference in becoming happier and healthier. Manage heart disease easily through better tracking: - Deepen your knowledge to empower you to make more conscious choices - Learn about your condition, not just about counting - Get a better understanding of which habbits you should put more effort - Discover how making small changes, like simply switching login symptoms, can have a positive effect on your health What you can do as a free Hearty user: - Follow a care plan and get your vitals and symptoms tracked - Easy tracking with HealthKit integration - Get a basic day plan to see how well you’re meeting daily goals, plus the quality of vitals you track each day - Track your daily symptoms - Track your weight and blood pressure measurements - Look at trends and see how your are doing - Import and export your symptoms data, and weight and blood pressure measurements to and from the Apple Health app - Share your health data with your care team DISCLAIMER: PLEASE FOLLOW DOCTOR’S ADVICE IN ADDITION TO USING THIS APP AND BEFORE MAKING ANY MEDICAL DECISIONS. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
Formik
React Navigation
BUILD KIT DIFFICULTY
Starter
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.
