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Cardiio - Heart Rate Monitor + 7 Minute Workout Exercise Routine for Cardio Health and Fitness

By Cardiio, Inc.

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Cardiio helps you measure your heart rate, learn how the numbers relate to your health, perform effective workouts to get in shape, and track your progress.
*** Popular Science Top 10 Inventions 2011 *** Featured in the New York Times, BBC, The Doctors (CBS), ABC News and more ***

The Cardiio app turns your iPhone or iPad into a heart rate monitor!

• Just hold your phone or tablet in front of you, or
• Simply cover the rear camera with your finger to read your pulse in seconds

GAIN INSIGHT into what your heart rate numbers mean:
• Get a fitness level rating based on your heart rate
• Calculate your endurance score (VO2 max)
• See how your heart rate stacks up to people from other countries and famous athletes
• Obtain a gender- and age- specific heart rate analysis [*PRO]
• Estimate your potential life expectancy [*PRO]

GET HEALTHIER, improve your fitness and endurance:
• Built-in high-intensity circuit training program that only takes 7 minutes to complete, and can be performed anywhere
• 7-minute workout consists of 12 exercises with detailed explanations and audio cues
• Find out your target heart rate range to maximize your workout [*PRO]
• Know how many calories you've burned by simply measuring your active heart rate after any workout session [*PRO]

• Personal dashboard with history (daily, weekly and monthly)
• Edit, annotate, export your data (CSV)
• Compete with your friends on Facebook to see who's the fittest
• Syncs with Apple Health, RunKeeper
• Share your achievements to Facebook, Twitter.

*UPGRADE to enjoy all the PRO features!

Cardiio’s technology is based on cutting-edge research and science conducted at the MIT Media Lab. The measurement principles are the same as clinical pulse oximeters. Every time your heart beats, more blood rushes through the vessels in your face, causing them to expand. The increase in blood volume absorbs more light, resulting in a decrease in the amount of light reflected from your face. Using sophisticated software, your iPhone's camera can track these tiny variations in light that are invisible to the naked eye to calculate your heart rate.

Studies have shown that our heart rate measurements are within 3 bpm of a clinical pulse oximeter when performed at rest in a well-lit environment (Poh et al., Optics Express 2010, Poh et al., IEEE Trans Biomed Eng 2011).

• Look ahead and hold your phone 6 inches in front of your face
• Be in a well-lit area so your face is well illuminated.
• Make sure your face is clearly visible (e.g. no long hair covering your forehead etc.) so that it can be easily detected.
• Don’t have a bright background behind you (backlight) - it makes your face appear dark in contrast.
• Fold one arm across your chest and rest the other arm that’s holding your phone against it to provide support and reduce motion of the phone during measurement.
• Hold your phone steady and keep still during the measurement.

NEED HELP? If you have difficulty with the app, just contact us:


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..."

Although accurate when used properly, 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 research, informational and educational purposes only.

What's New in Version 3.3.1

-Updated for iOS 9
-Improved finger detection
-Bug fixes


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Customer Reviews

Innovative, easy to use

I tried using Cardiio on my iPod touch a few years ago, and thought it was the coolest thing I had ever seen an iOS device do. Then I got an iPhone, and the camera was so much better and so much more accurate that I was again blown away by how easy to use and accurate this app was at measuring your heart rate.

I recently had a medical accident and am in the process of healing, and it is very helpful to be able to record my heart rate throughout the week and report to my doctor. Cardiio and apps like it give me hope that the future will be one of patients being able to record a multitude of biometrics at home instead of having to wait until a doctors visit.

Great app

I was very skeptical with apps such as this so I finally decided once and for all to test it with the help of my doctor since I have a upcoming appointment. I used it waking up, after my morning run, during work, and before bed at night. First I would take my own pulse then let the app do its thing then I would compare my results to my doctors when he checks my pulse which I did, and my conclusion is it's does what it's says and is intended to do and it is within 1or 2 points -/+ from when I checked myself and then with my doctor findings. A very accurate app!

The best app in its category

After evaluating the top 5 heart rate measuring apps available for iOS, this is hands down the best app of the bunch, including free and for-purchase apps. I can't say I've had luck with the facial measurement mode, but I prefer the finger measuring mode anyway. It's fast, accurate, and they even display interesting trivia and data while you wait (you gotta read fast tho!)

Anyway, If you haven't downloaded or tried any other heart rate app, look no further. I've done the due diligence and this app is te best.

Cardiio - Heart Rate Monitor + 7 Minute Workout Exercise Routine for Cardio Health and Fitness
View In iTunes
This app is designed for both iPhone and iPad
  • Free
  • Category: Health & Fitness
  • Updated:
  • Version: 3.3.1
  • Size: 34.2 MB
  • Languages: English, Dutch, French, German, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Traditional Chinese
  • Seller:

Compatibility: Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

Current Version:
All Versions:

Top In-App Purchases

  1. Full Pro Upgrade!$6.99
  2. Life Expectancy Pack$2.99
  3. Pulse Waveform Pack$3.99
  4. Calorie-Burn Monitor$4.99
  5. Specific Heart Rate Pack$2.99
  6. Target Heart Rate Pack$3.99
  7. Coach Max$0.99
  8. Coach Jack$1.99
  9. Coach Nadia$1.99
  10. Coach Emma$0.99