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
HealthAlerter
HealthAlerter monitors your heart rate using Apple Watch and sends real-time alerts to your emergency contacts when it detects dangerously high or low heart rate.
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.0
1 ratings · Below Average
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 HealthAlerter: 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
Allow users to set custom alert sounds and vibrations.
Assumption to check: Limited customization of alerts
Validate with people who use this workflow before building.
Hypothesis 2
Introduce social sharing or challenges to motivate users.
Assumption to check: No social features
Validate with people who use this workflow before building.
Hypothesis 3
Provide more detailed graphs and insights into health trends.
Assumption to check: Lack of data visualization
Validate with people who use this workflow before building.
Hypothesis 4
Implement a more reliable notification system for alerts.
Assumption to check: Inconsistent reminders
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
HealthAlerter monitors your heart rate using Apple Watch and sends real-time alerts to your emergency contacts when it detects dangerously high or low heart rate. Perfect for you or your loved ones — especially elderly parents or those with heart conditions. ===Key Features:=== Monitors heart rate every minute via HealthKit Sends instant alerts when heart rate is too high or too low Alerts sent via Phone Call, SMS, or Email Get a notification on the Apple Watch instantly Designed for peace of mind and fast response ===Custom Alerts:=== Set your own min heart rate (40–90 bpm) Set your own max heart rate (100–180 bpm) Fully adjustable from Apple Watch settings False Alert Prevention: Automatically stops monitoring if no motion is detected (watch off wrist) Reduces false alarms using Apple Watch motion sensors ==How to Set Up:=== Requires a free PagerDuty API Key to send alerts. Sign up at(Free plan available): pagerduty.com Go to Apps & Add-Ons - API Access - Create API Key Open the app on your Apple Watch - Tap Settings - Enter the key Tap Start to begin monitoring Setup guide: YouTube Video https://www.youtube.com/watch?v=6pL9D2ZmEjI ===International Users:=== Use services like localphone.com to forward call alerts outside the US. ===Privacy Notice:=== HealthAlerter uses HealthKit to read your heart rate data. Your data stays on your device and is never shared. Be proactive. Protect the ones you love. Download HealthAlerter now.
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
Zustand
react-native-svg
TypeScript
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.
