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 History: AFib & Alerts
Visualize your heart health with precision.
$1.99 · In-app purchases
PRICE
$1.99
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.
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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 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 Heart History: AFib & Alerts: 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
Integrate reminders and customizable notifications for AFib logging.
Assumption to check: Lack of user engagement features like reminders or notifications
Validate with people who use this workflow before building.
Hypothesis 2
Provide detailed graphs and statistics to help users visualize their AFib history.
Assumption to check: Limited data visualization options for tracking trends
Validate with people who use this workflow before building.
Hypothesis 3
Offer clear subscription management and options for users to choose plans easily.
Assumption to check: Inadequate subscription management options
Validate with people who use this workflow before building.
Hypothesis 4
Create a guided onboarding for new users to understand how to use the app effectively.
Assumption to check: Poor onboarding experience
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
Visualize your heart health with precision. Heart History bridges the gap between raw Apple Watch data and human understanding. Whether you have a diagnosis or are simply monitoring for irregularities, our app turns complex HealthKit data into a clear, professional timeline. WHY HEART HISTORY? • FOR AFIB HISTORY: Monitor your weekly burden percentage with color-coded zones (Green/Orange/Red) to spot trends instantly. • FOR RHYTHM ALERTS: See a clean timeline of irregular rhythm notifications, filtered by date and frequency. • SMART VALIDATION (NEW): The app now distinguishes between "No Alerts" and "Watch Not Worn." If you haven't worn your watch in 24 hours, the dashboard pauses to ensure you only see a "Safe" status when monitoring is actually active. • AT A GLANCE: Includes beautiful Home Screen and Lock Screen widgets so you never miss a change in your trends. CORE FEATURES • MEDICAL-GRADE VISUALIZATION: Clear bars, distinct colors, and legible typography. • ADVANCED ANALYTICS: View your "Alert Frequency" and "Total Active Days" to understand your monitoring density. • CONTEXTUAL INSIGHTS: Automatically calculates weekly comparisons (e.g., "+0.5% vs last week"). • 100% PRIVATE & LOCAL: We do not collect, store, or share your data. Everything happens on your iPhone and Watch. IMPORTANT This app requires an Apple Watch with "AFib History" enabled or "Irregular Rhythm Notifications" active. If you do not have this data in your Health app, the dashboard will remain empty. DISCLAIMER This app is for informational purposes only and is not a medical device. It visualizes data already recorded by your Apple Watch. It does not diagnose health conditions. Please consult a medical professional for any health concerns.
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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.
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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.
