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
Multi hrm
Multi-Person Heart Rate Monitoring - Exercise Together with Friends
$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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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Multi hrm: 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
Offer extensive APIs for data sharing with popular fitness platforms.
Assumption to check: Limited integrations with other fitness apps
Validate with people who use this workflow before building.
Hypothesis 2
Introduce social challenges and community features.
Assumption to check: Low user engagement due to lack of social features
Validate with people who use this workflow before building.
Hypothesis 3
Enhance charts and graphs for better insights.
Assumption to check: Inadequate data visualization
Validate with people who use this workflow before building.
Hypothesis 4
Implement customizable reminders and notifications.
Assumption to check: No reminders for workouts
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
Multi-Person Heart Rate Monitoring - Exercise Together with Friends This software is not a medical software and is only used for heart rate reference during exercise. Are you tired of working out alone? Now you can exercise with friends while tracking everyone's heart rates in real time. Multi-Person Heart Rate Monitoring creates an interactive fitness experience that makes workouts more fun and engaging. This powerful tool not only tracks your personal heart rate but also connects multiple devices to create a shared fitness experience. Perfect for group training, friendly competitions, or family workouts. Key Features Real-Time Heart Rate Tracking for Groups Connect multiple devices including Apple Watch, Bluetooth chest straps, and compatible smartwatches from brands like Huawei and Garmin. View everyone's heart rate data simultaneously on one iPhone or iPad screen. See who reaches their target zone first or maintains the best endurance. Ideal for group cardio, cycling classes, or running clubs. Convenient Heart Rate Display Check your heart rate without unlocking your phone. View real-time data through iPhone's Dynamic Island, lock screen widgets, or home screen widgets. Heart Rate Data Sharing Easily share your heart rate data with other fitness apps and equipment like exercise bikes and treadmills. Apple Watch Integration Control your Apple Watch workouts directly from your iPhone. Sync heart rate, workout duration, and other data for better visibility. Personalized Heart Rate Zones Set custom heart rate zones for different fitness goals like fat burning, cardio training, or recovery. The app helps you stay in your optimal workout zone. Workout History and Analysis Track your progress with detailed workout records. Review individual and group performance including heart rate trends and time spent in each zone. Compatible with Many Devices Works with Apple Watch, Bluetooth chest straps, and most major smartwatch brands. Everyone can join regardless of their device. How It Works The organizer connects their heart rate device and invites others to join Everyone starts tracking simultaneously View real-time heart rate data for all participants Review detailed workout reports afterward Download Multi-Person Heart Rate Monitoring today and transform your workouts into a fun, shared experience with friends and family. Stay motivated together and achieve your fitness goals.
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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.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
React Navigation
Recharts
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.
