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
Blood Oxygen App
Monitor your blood oxygen level and heart rate effortlessly with our app and sync your Apple Watch to get alerts about low levels.*
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
31,389 ratings · Top 15%
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 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 Blood Oxygen App: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Monitor your blood oxygen level and heart rate effortlessly with our app and sync your Apple Watch to get alerts about low levels.* Are you worried about your oxygen levels dropping or wondering how your activities affect your blood oxygen? Our app makes it easy to track these vital signs wherever you go. Track and log your vital signs to share with your doctor later, or stay informed about your cardiovascular health with curated articles—all in one app. But hang on, there's more: • Take an oxygen test effortlessly, and conveniently record and monitor your data. • Use your phone’s camera to estimate your heart rate and then easily log your data afterward. • Sync and store your data in Apple Health or retrieve your blood oxygen and heart rate readings from Apple Health. • Log and easily export your blood oxygen and heart rate data into PDF to share with your doctor. • Regain your calm after a stressful experience by practicing box breathing, all within the app! • Receive sleep reports to assist you in achieving your sleep goals. (requires an Apple Watch Series 3 or later with watchOS 8) *Please be aware that to receive push notifications regarding changes in your blood oxygen level or heart rate, you will need an external device such as a pulse oximeter or a smartwatch. Blood Oxygen App is free to download and utilize. However, users can opt for a subscription to access additional features. Your subscription will automatically renew and you’ll be billed based on the plan you choose. You can cancel your subscription at any time in the App Store. Disclaimer: For wellness use only. The App is intended to improve your awareness of general wellness. The App can't be used for diagnostics or medical purposes. The App does not diagnose, treat, mitigate, or prevent any disease, symptom, disorder, or abnormal physical state. Always seek a health care professional or emergency services if you believe you may have a medical issue. Terms of use: https://aboutmeapps.com/terms-of-use/ Privacy policy: https://aboutmeapps.com/privacy-policy/
Written user reviews are not shown here. Check current App Store reviews >
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 feature and provide guidance on usage.
Assumption to check: Users report inaccurate readings compared to medical devices.
Validate with people who use this workflow before building.
Hypothesis 2
Add graphs and trends for better insights.
Assumption to check: Limited historical data analysis options.
Validate with people who use this workflow before building.
Hypothesis 3
Offer more generous free trial or unlimited basic features.
Assumption to check: Free version limits the number of measurements.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify onboarding and add tooltips for features.
Assumption to check: Confusing navigation for new users.
Validate with people who use this workflow before building.
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
Redux
React Navigation
Axios
Expo Sensors
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.
