App Overview

Cardiograph icon

Cardiograph

MacroPinch Ltd. · Health & Fitness

Cardiograph is a fast and reliable way to measure your heart rate on iPhone and iPad

$1.99 · In-app purchases

PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.7
2,276 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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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/
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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.

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.

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
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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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 better algorithms for heart rate detection.

Assumption to check: Users often report inaccurate heart rate measurements

Validate with people who use this workflow before building.

Hypothesis 2

Optimize data fetching and UI rendering.

Assumption to check: App can be slow to load historical data

Validate with people who use this workflow before building.

Hypothesis 3

Add features to customize heart rate notifications and measurement intervals.

Assumption to check: Limited customization options for users

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

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

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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
Supabase
react-navigation
@supabase/supabase-js
react-native-reanimated
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.