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.
Cardiograph is a fast and reliable way to measure your heart rate on iPhone and iPad
$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 Cardiograph: 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: Users often report inaccurate heart rate measurements
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: App can be slow to load historical data
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Limited customization options for users
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.
Cardiograph is a fast and reliable way to measure your heart rate on iPhone and iPad. Using only your device’s built-in camera — with no additional hardware required — allows you to keep track of your heart’s rhythm anywhere and at any time. The detailed history records and ability to sync, tag, share and print individual measurements make it a versatile tool for monitoring your cardiovascular health. Accurate Results, Almost Instantly Having a quick and easy way to know how fast your heart is beating has many uses — from improving your exercise regime to keeping regular track of your heart’s condition, or even just for fun. Cardiograph makes that easy, with precise results that appear within a few seconds. Clean, Simplistic Design The minimalistic and intuitive design shows you everything at a glance and makes Cardiograph approachable and easy to use for everyone. Detailed History Save your measurements (including every individual heartbeat!) for future reference or for sharing with your family or health care professional. You can also add a label to each measurement depending on the intensity of your exercise or your activity level. Export & Share Your Measurements Each measurement can be shared, exported as a PDF file and even printed on paper directly from within the app. If you have our previous app, Cardiograph Classic, you can transfer all of your measurements to the new app with a couple of taps. Designed for iPhone & iPad Cardiograph is a native app that takes advantage of the iPhone & iPad’s distinctive features like the excellent cameras, 3D Touch (where available) and support for syncing with the Apple Health app (where available). IMPORTANT: This application, although sufficiently accurate, is not meant as a replacement for professional medical equipment and qualified care. If you have any concerns about your heart’s condition, please consult your physician or general practitioner. If you’re having issues with Cardiograph, check out the “More” section within the app or contact us at our support e-mail and we’ll help you out. Get in touch with us and follow the latest news regarding our apps: http://www.facebook.com/macropinch http://twitter.com/macropinch
Written user reviews are not shown here. Check current App Store reviews >
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.