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
Bluetooth Heart Rate Monitor
Bluetooth Heart Rate Monitor
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 ratings · Top 5%
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 included14 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 Bluetooth Heart Rate Monitor: 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
Support a wider range of Bluetooth heart rate monitors.
Assumption to check: Limited Bluetooth device compatibility
Validate with people who use this workflow before building.
Hypothesis 2
Provide advanced metrics and insights into heart rate trends.
Assumption to check: Lack of detailed analytics
Validate with people who use this workflow before building.
Hypothesis 3
Add options for users to share their progress on social media.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Introduce subscription-based premium features for ongoing support and updates.
Assumption to check: One-time purchase only
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
Bluetooth Heart Rate Monitor I developed this Bluetooth Heart Rate Monitor because I wanted to collect heart rate data from my Coros arm band heart rate monitor while practicing martial arts. With my iPhone in the same room (within Bluetooth BLE4+ range), the app records heart rate data at my chosen interval and syncs it to Apple Health. It should work with any 3rd party BLE4+ heart rate monitor device. Features include: - Auto-start recording when the app launches - Auto-reconnect if device goes out and back into range - Runs in the background (while you are training) - Battery percentage display (if supported by your device) - Simple line graph showing recent heart rate readings - Syncs with Apple Health - New - Recording frequency expanded to 60 seconds - New - set min/max heart rate and now colour coded graph (Blue: Below Min, Green: Min-Max, Red: above Max). - New - Displays the graph as a Live Activity on the Lock Screen and heart rate on Dynamic Island when in background No unnecessary extras—just the essentials. But if you need additional features, let me know—I’m happy to help!
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
react-navigation
react-native-ble-manager
react-native-svg
@react-native-community/async-storage
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.
