Cardiio: Heart Rate Monitor 4+

Cardiogram + 7 Minute Workout

Cardiio, Inc.

Designed for iPad

    • 4.6 • 5.4K Ratings
    • Free
    • Offers In-App Purchases



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 4.0.15

- Performance improvements
- Bug fixes

Ratings and Reviews

4.6 out of 5
5.4K Ratings

5.4K Ratings

Petesuper ,

Personal details

It might be there , but I'd like to be able to just click onto my name to keep easy records. I said it might be there but please remember this.. One day you will be in my shoes. Older people don't understand how things work. Their eye sight is generally quite poor. Technology is a catch up process and that's why I say things have to be more than obvious. When you make a program , take to some old codger and say , eh mate have a go at this. Don't you help him by explaining it. He or she has to go from the start. I'm pretty much ok at things as i used to do some programming, Try that with a general labourer. When you retire the ipad becomes a new world to us. A great world.
I once told a shampoo company something similar . My question related to marketing their product to clearly indicate the difference between shampoo and conditioner. When I take my glasses off I often wash my hair with conditioner. Also consider the blind.
I sure you get my drift. I think your program is ace. I'm a first aid instructor and can see its merit.

It would be good to have any murmur identified so that the client can have it closely checked out by their Gen Prac so this would give a clear value for the app

Thank you

Regards. Pete

Michelle 💕 ,


I really appreciate this free app! My cardiologist has checked my heart rate at the same time and was impressed with the accuracy ( I know it’s not a 100% medical tool etc but it’s great it works for me ) I have told many friends and family members about it too and they also have been happy. Thanks Cardiio

Tigger2213 ,

Unsuitable for those outside "normal"

The app does not have a way to record irregular heart rates/arrhythmia, especially during severe tachycardia, including SVT events. Instead, it interprets as poor signal and does nor offer an option to save the waveform. Wouldn't have paid had I known.

Edit: Had to edit review to reduce the rating. The new look and its update are pretty bad. The app badly needs a feature where user gets an option to save the reading and waveform even if the app "thinks" it is wrong. It shows the waveform but decides not to save. This is useless.

Also, with the exercises, there is no user flexibility in choosing what kind of exercises you wish to do and for how long you want to do them. There are some exercises, such as jumping jacks, step on stool, side plank that I cannot do due to some injuries and medical problems, but I have no option to simply skip these and move on to the next. I have to wait for the annoying voice to finish making me wait until I check out the next. Ain't nobody got time for that.

I had high hopes with this app, but I now regret paying for this app.

App Privacy

The developer, Cardiio, Inc., 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 Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Some in‑app purchases, including subscriptions, may be shareable with your family group when Family Sharing is enabled.

More By This Developer

You Might Also Like

Cardiograph Heart Rate Monitor
Instant Pulse - Blood Pressure
Health & Fitness
Instant Heart Rate: HR Monitor
Health & Fitness
Heart Rate Plus: Pulse Monitor
Health & Fitness
Heart Rate Monitor - Pulse BPM
Health & Fitness
Heart Rate Monitor - Pulse, bp