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
37.5K Ratings

37.5K Ratings

charliec63 ,

A reasonable app

Generally good. The sensor part of the app does a reasonable job, when the circulation to my finger is good. Sometimes after a strenuous workout, or even during one measurements can get squirrelly. My BP tends towards low and so sometimes given the right circumstances it looks like I'm flat lining it.

The basic app is festooned with adds/add-ons of dubious benefit. Not quite as bad as some of the other count your heartbeat apps, but they're there.

Update 8/17 They've upgraded the measurement function so it reliably works on my iPhone 7. It's much better than doing a remote facial pulse determination. The add ons are still a bit gooey. I'm certain waveform will prove useful, but getting useful medical data from sporadic measurements is a bit weird.

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.

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.


Cardiio, Inc.
28.8 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Dutch, French, German, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Traditional Chinese

Age Rating
In-App Purchases
  1. Full Pro Upgrade! $9.99
  2. Pulse Waveform Pack $7.99
  3. Hypothetical Life Expectancy Pack $4.99


  • Family Sharing

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

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