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
Heart Rate Live
Track Your Heartrate with Ease – No Subscriptions, Lifetime Access!
$3.99 · In-app purchases
PRICE
$3.99
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
Make this idea yours
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 included16 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 Heart Rate Live: 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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Continue in Rork >
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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
Integrate with Apple Health and Google Fit for comprehensive tracking.
Assumption to check: Limited integration with health tracking devices
Validate with people who use this workflow before building.
Hypothesis 2
Implement calibration features to improve accuracy.
Assumption to check: Inaccurate heart rate readings in some cases
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing options and challenges to engage users.
Assumption to check: Lack of social features for sharing progress
Validate with people who use this workflow before building.
Hypothesis 4
Include articles or tips about heart health and fitness.
Assumption to check: No educational resources about heart health
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
Track Your Heartrate with Ease – No Subscriptions, Lifetime Access! Looking for a reliable and easy-to-use heart rate tracker? Our app is designed to give you an accurate and comprehensive look at your heart health, without the hassle of subscriptions. With a simple one-time payment, you can enjoy lifetime access to all features—no recurring fees! Key Features - Precise Heart Rate: Accurate readings in real-time. - Instant Insights: Know your heart health with quick status updates. - Track Your Progress: Store and analyze heart rate history. - Multi-User Support: Share with family or friends. - One-Time Payment: Pay once, enjoy lifetime access. Disclaimer Heart Rate Live is not a medical device. The app is intended for informational and fitness purposes only. Always consult a qualified medical professional for any health concerns. Seek a doctor’s advice in addition to using this app and before making any medical 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
Supabase
react-navigation
expo-sensors
@supabase/supabase-js
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.
