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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 3.3.0

-Fully translated into 12 different languages (English, Chinese, Japanese, Korean, French, German, Italian, Russian, Dutch, Swedish, Portugese, Spanish).

-Improved heart rate measurement algorithm

-Improved progress bar indicator

-Bug fixes


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Customer Reviews

Don't upgrade

This new upgrade has introduced very annoying ads (ones across the bottom and full screen that you have to exit out of to use the app). Like the another reviewer, I can understand if the developers weren't profiting and would like some way to make income. But, some of the 'features' they are charging for seem ridiculous. You can pay to see your 'pulse waveform' which I believe is just a record of how the light in your finger changes over time. How is that useful? To an untrained eye, perhaps it looks a bit like an EKG, which makes me feel like the developers are hoping to take advantage of people's ignorance. Why would you ask people to pay to find their target heart rate when the formula is so simple? DO NOT UPGRADE. No new features have been added- just annoying ads.

It still has some stars, because it does accurately perform its base feature, measuring your heart rate with a finger against the lens.

New rear facing camera option solves issues

This works ok with the front facing camera, but with the new rear facing camera illuminated with the flash it can work in dim light and after exercise.

Accurate enough for me to see pulses from individual chambers & valve action reflected in the graph (your lub and your dub) at resting heart rate.

You have to keep still for the most accurate graph as motion or movement of your finger, changes in finger pressure will induce noise on the graph, but you will still see an accurate pulse number.

Basically turning your phone into a virtual pulse oximeter (w/o the sat levels) it's Much easier and more accurate than taking your pulse with your fingers and a watch.

I hope they can add in O2 saturation at some point in time, that'd be nice too and it would seem doable with the technology (multi wavelength color camera / white light).

Works better than my Sphygmomanometer

(That's a fancy word for blood pressure cuff.) On the advice of my doctor, I have been measuring my blood pressure for about a year using a cheap device I got from Walgreens. When I first got Cardiio, I took readings on my right finger while using the cuff on my left arm. The readings were consistently different, so I assumed the app was at fault. Then I used a stopwatch and actually counted my pulses. Guess what? Cardio was right, the blood pressure meter was wrong. Now I use it every morning before I get out of bed and one or two times during the day.

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: 3.3.0
  • 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. This app is optimized for iPhone 5.

Customer Ratings

Current Version:
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Top In-App Purchases

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