Cardiio helps you measure your pulse (heart rate) using your phone camera, learn how the numbers relate to your general wellness, perform effective workouts to get in shape, and track your progress.
*** Featured on The Doctors (CBS), ABC News and more ***

• Just hold your iPhone or iPad and simply cover the back camera with your finger to read your pulse

• See how your heart rate relates to your fitness and endurance

• Built-in high-intensity circuit training exercises that only takes 7 minutes to complete

• Personal dashboard with history (daily, weekly and monthly)
• Save, edit, annotate, export your data (CSV)

• Save your heart rate measurements to the Apple Health app.

*Upgrade to PRO to enjoy the full features of the app!


Blood absorbs light. Every time your heart beats, the blood flow to your finger increases, causing more light to be absorbed. In between beats, less light is absorbed. By using your smartphone camera to capture tiny changes in reflected light from your finger, Cardiio can calculate your heart rate.

• ALWAYS hold your phone steady, keep still, and don’t talk during a measurement.
• Make sure your fingers are not cold.
• Cover the entire back camera lightly with your finger; Don't press too hard to avoid restricting blood flow to your finger.

Terms of service:
Privacy policy:


PC Magazine - "… the app is simple, yet beautiful and pretty slick."

Cult of Mac - "Cardiio is one of those apps that wows you..."

Lifehacker - "it’s a little mind-blowing..."

If knowing your pulse rate is critical to your health, you need to have your pulse taken by a medical professional. Cardiio is not intended to diagnose, prevent or treat any condition, or to be a substitute for professional medical care. Measurements and statistics are intended for informational and educational purposes only, to support general health and wellness. The Cardiio app has not been tested with individuals with health conditions, is not a clinical pulse oximeter and has not been cleared or approved by the U.S. Food and Drug Administration.

What’s New

Version 4.0.6

Hello there! In this update we improved the overall performance of the app. If you like the app, please take a minute to rate us in the App Store.

Ratings and Reviews

4.7 out of 5
47.5K Ratings

47.5K Ratings

Owl3369 ,

Best Pulse bpm ios app

Before using Cardio I tried several 'free' apps and a few paid apps and all were unsatisfactory. First, most of these other apps indicate they are for iPhone and iPad but they do not work on the iPad because to take a finger reading you need a camera with light--iPad has no camera light. The Cardio app works on both iPhone and iPad and automatically imports results into Apple's Health app. Cardio measures pulse by either finger or face readings on iPhone and by face on the iPad. Readings are very accurate and match the exact same values taken in my physician's office. Excellent customer service if you have any questions.

Lowthers8 ,

Doesn’t work with iPhone 11 Pro Max

Beware - this app simply doesn’t work with the flagship Apple iPhone 11 Pro Max. The problem seems to be the three cameras built into the iPhone 11 Pro Max. I contacted the help desk who in turn simply replied that I should read the directions. Either the help desk people don’t realize their own app directions are no longer up to date for current versions of iPhone, or I hope I’m wrong but perhaps they simply don’t care about customers of this app any longer. The app directions only refer to iPhones with a single camera. If it was just experimenting with placing my finger over one of the three cameras of the iPhone 11 Pro Max, or some combination of cameras, I wouldn’t have had to see if the help desk could actually “help” a customer.
If you’re using most any version of iPhone less than the iPhone 11 Pro Max, this app is fantastic and works well.
I hope the developer decides to update this app for Apple’s flagship iPhone.
I also hope the help desk procedures get updated to provide actual help to customers.

steph0468 ,

Paid 7.99 for the waveform measurement

I paid for the waveform measurement thinking it would give a little more detail about what is seen in the heart rate, like maybe a missing p wave, or too long a length between certain parts of the know, length of time to the T wave or whatever. I didn’t expect the only information shown after 7.99 (a lot by app standards) to only say: -.2 sec. <—-that’s it. That’s what you get for 7.99. Okay? How is that even remotely worth any money at all and how does that help me? I downloaded the app and would pay 50 bucks if it helped me figure out why I get breathless for no reason after never smoking and while just sitting. People downloading heart rate apps have heart rate questions. I don’t expect it to be a doctor in an app. But I do expect 7.99 to measure something resembling anything. I feel betrayed. I feel stupid for parting with that much money. I made an assumption that 7.99 meant the waveform was analyzed. It’s not.

App Privacy

The developer, Cardiio, Inc., has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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