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.
Heart Rate and Oxygen Monitor
$1.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Heart Rate, Oxygen 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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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
Assumption to check: Limited sensor compatibility with devices
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inconsistent measurement accuracy
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Absence of detailed analytics
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Heart Rate and Oxygen Monitor Take control of your health with Heart Rate & Oxygen Monitor, a powerful heart rate and oxygen (O2) monitoring app designed to provide real-time insights into your cardiovascular well-being—all from the convenience of your wrist. Whether you're tracking your fitness, managing stress levels, or keeping an eye on your overall health, First Responder is your go-to companion for understanding your body's most vital signs. Key Features: 1. Heart Rate Monitoring (HR) Track your heart rate in real-time with heart rate monitoring. View accurate heart rate data on your Apple Watch and stay informed about your heart health, whether you're exercising or simply going about your day. 2. Oxygen Saturation Monitoring (O2) Provides real-time blood oxygen (SpO2) level monitoring, displayed on the same screen as your heart rate data. Keep an eye on your oxygen levels to better understand your body's performance and detect potential health issues early. 3. Dual-Screen Health Insights Our simple and intuitive user interface allows you to monitor both your heart rate and oxygen saturation at the same time. Visual feedback, with easy-to-read metrics, ensures you can quickly interpret your body's vital signs. 4. No Data Tracking or Sharing At Sax Compute Ltd, privacy is our top priority. Rest assured that no data is collected, shared, or tracked. Sax Compute Ltd does not process or store any personal or health data. Your information stays on your device, completely private. You can use the app on anyone’s wrist without affecting their personal health data. 5. Charity Donation We believe in making a difference beyond just health. 30% of the net profit from the sale of First Responder goes directly to the UK Air Ambulance charity. Every purchase helps fund life-saving services across the UK. 6. Fast Loading and User-Friendly We know that time is precious, especially when monitoring your health. That's why Heart Rate & Oxygen Monitor is optimized for fast loading, ensuring that you can get to your vital health data in no time, without delays. 7. One-Time Purchase, No Subscriptions Enjoy First Responder with a simple, one-time purchase. No subscriptions, no recurring fees - just a straightforward app designed to help you monitor your health and support a good cause. Why Choose First Responder? No tracking or data collection: Unlike many apps, we don’t track your usage or store any of your personal data. Your health information is yours, and it stays on your device. Supporting a cause: With every purchase, you're contributing to a charity that saves lives daily. Your support helps the UK Air Ambulance service continue to operate, providing emergency medical services to those in need. Real-time insights: First Responder delivers real-time monitoring for two of your body's most crucial indicators—heart rate and oxygen saturation—helping you stay informed about your health at all times. Perfect for: Athletes who need quick, real-time heart rate and oxygen monitoring during workouts. Individuals who want to manage stress and keep an eye on their heart health. Anyone concerned about their oxygen levels, especially those with underlying health conditions or respiratory concerns. Users who value privacy and prefer apps that don’t collect or process their data. Stay connected to your health while supporting a cause that makes a difference. With First Responder, you’ll not only be empowered with crucial health information, but you'll also contribute to life-saving services across the UK. Monitor your heart, track your oxygen, and make an impact with every use of the app and improve your health.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.