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, Oxygen Monitor Pro
First Responder is a heart rate and oxygen (SpO2) monitoring app for Apple Watch
$2.99 · In-app purchases
PRICE
$2.99
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 included15 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 Rate, Oxygen Monitor Pro: map the core Medical 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
Implement calibration features and provide user feedback on accuracy.
Assumption to check: Users often report inaccurate readings from health monitoring apps.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to export their historical data for personal tracking.
Assumption to check: Limited data history available for analysis.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription process and clarify benefits of each tier.
Assumption to check: Subscription models can be confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Prioritize stability and thorough testing before release.
Assumption to check: Frequent crashes or bugs in similar apps.
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
First Responder is a heart rate and oxygen (SpO2) monitoring app for Apple Watch. It provides real-time monitoring of heart rate and oxygen saturation on one screen without sharing, tracking, or saving any personal data. The app is designed to prioritize user privacy, allowing it to be used on different users' devices without affecting personal health data. Key features include: Real-time heart rate and oxygen monitoring. No data tracking, saving, or sharing of any kind. Simple and quick to use: No configuration required. 30% of net profit goes to the UK Air Ambulance charity. The app is fast to load and optimized for user convenience, with a simple one-time purchase and no subscriptions. If you need any test accounts or additional details, please feel free to reach out.Now with data streaming from Watch to Phone for remote monitoring(within bluetooth range) Always seek medical advice regarding any readings if you are concerned.
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.
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BUILD KIT DIFFICULTY
Starter
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.
