Cardia - HRR and HRV
HR & HRV with just your camera
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Two numbers, thirty seconds, zero hardware. Cardia reads your heart rate and HRV through your fingertip - and now syncs to Apple Health.
Your heart rate. And your rhythm. No watch required.
Cardia turns your iPhone’s camera and flash into a pulse sensor. Rest a fingertip over the lens and the flash, hold still for about 20 seconds, and get two numbers: heart rate (BPM) and heart rate variability (RMSSD).
HOW IT WORKS
Light from the flash passes through your fingertip. Each heartbeat shifts its colour, and the camera reads that rhythm using a technique called photoplethysmography (PPG). Cardia saves a number only when two independent methods agree on it. Nothing is recorded, and video never leaves your phone.
WHAT YOU GET
• Heart rate and HRV from one short reading
• A live camera view and pulse waveform while you take it
• Paced breathing at six breaths a minute, with your pulse on screen and your first and last minute side by side
• A 7-day chart on your Home screen
• Context tags such as morning, after coffee or after exercise, plus notes
• A weekly review of your readings and sessions
• A daily reminder that skips days you’ve already measured
• Home Screen and Lock Screen widgets
CARDIA PRO
• Unlimited paced-breathing sessions with your pulse on screen
• Your usual 30-day range, shaded behind every chart
• Each tag’s averages next to all your other readings, plus your own custom tags
• Sleep, workouts and Watch HRV from Apple Health, beside your readings
• Save readings to Apple Health, and breathing sessions as mindful minutes
• Unlimited readings, 30- and 90-day history, and CSV export
The free version includes one reading and one measured breathing session per day, and 7-day charts. No commitment. Cancel anytime.
PRIVATE BY DESIGN
Your readings are stored on your iPhone. No account. No ads. No tracking. Apple Health is only used if you turn it on.
Cardia is a wellness tool. It is not a medical device and does not diagnose, treat, or monitor any condition.
TERMS: https://www.koirala.studio/apps/cardia/terms
PRIVACY: https://www.koirala.studio/apps/cardia/privacy
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- UI Redesign
- Added Widget Extension
- Bug fixes
The developer, Ashish Koirala, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Ashish Koirala
- Size
- 8.2 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
- In-App Purchases
Yes
- Monthly Subscription $2.99
- Annual Plan $12.99
- Copyright
- © 2026 Koirala Studio