Cardiio: Heart Rate Monitor

Cardiio: Heart Rate Monitor

HR checker & beat analyzer

58K ratings
2014 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • August 9, 2012
  • June 26, 2026

Features

Cardiio: Heart Rate Monitor video #1 for iPhone
Cardiio: Heart Rate Monitor screenshot #2 for iPhone
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Cardiio: Heart Rate Monitor screenshot #5 for iPhone
Cardiio: Heart Rate Monitor screenshot #6 for iPhone
Cardiio: Heart Rate Monitor screenshot #7 for iPhone
Cardiio: Heart Rate Monitor screenshot #8 for iPhone
Cardiio: Heart Rate Monitor screenshot #9 for iPhone
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About

Easily track your heart rate, blood oxygen, and fitness using your phone's camera. Get instant readings, analyze trends, and access quick workouts to improve your cardiovascular health. Unlock advanced features for deeper insights and personalized health comparisons.

Instant heart rate monitoring
Blood oxygen and fitness tracking
Quick 7-minute workouts
Progress trend analysis
Syncs with Apple Health
Data export for doctors
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What users say

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What's New in Cardiio

4.1.7

June 26, 2026

- Performance improvements - Bug fixes

Subscription plans

Weekly Pro Upgrade

Get unlimited pro features and tracking

$6.997 Days
3 Days trial
How to cancel Cardiio subscription ⁉️
10

In-App Purchases

₩11000

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User reviews

Slow and Hard to Work With

I do think the app is organized, however it’s SO difficult to work with and it takes like ten tries each time you want to record your heart rate. I tried using this for a class, but by the time it recorded, my heart rate would lower after a workout. It’s just not reliable and I’ve talked to some of my friends who used this app for the same reason and they had the same issues with it. Do not recommend.
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Poor signal quality?

I will watch as the app measures my heart rate and stays in a very narrow range as I hold my finger over the camera for however long. It seems perfect, but then it just says “poor signal quality” with no other explanation. The signal quality was in fact not poor as I watched the data being collected and it seemed to be very consistent throughout the entire process. I need to use this app to properly measure my heart rate, and it is not doing what it claims to be good at.
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Doesn’t work

Every time I used it, it measured the heart rate for quite a long time. Then, at the very end, it said “poor signal” and terminated. This is a terrible product. I deleted it, and I don’t miss it at all.

Didn’t work

Every time I tried said poor signal and couldn’t do a reading no matter how I adjusted the light and camera. Other similar apps worked much better and actually worked. Disappointed.

Makes it simple!

I enjoy checking my bpm with this makes it so easy

Developer apps

User experience

🐞

Reported Bugs

3 issues

App crashes or freezes

Bug

Inaccurate or missing heart rate data

Bug

Inability to save or export readings

Bug

Requested Features

4 requests

Customizable workout options

Feature

Support for irregular heart rhythms

Feature

Better historical data tracking

Feature

Gender-neutral setup options

Feature

FAQ

What does Cardiio do?

Cardiio transforms your iPhone into a health tool to track your heart rate, blood oxygen, and fitness. It provides instant readings, analyzes trends over time, and offers quick workouts to improve heart health. The app is designed for informational purposes and not for medical use.

How do I measure my heart rate with Cardiio?

To measure your heart rate, simply place your finger on your iPhone's camera. The app will then provide an accurate reading in seconds. This feature allows for effortless and instant heart rate monitoring.

Is Cardiio free to use?

Cardiio offers a complete set of free features for heart rate tracking and basic health monitoring. For more advanced features like in-depth pulse waveform analysis, blood pressure estimates, and detailed oxygen tracking, users can choose to upgrade to Cardiio PRO.

What are the key features of Cardiio?

Key features include instant heart rate monitoring, all-in-one health tracking (heart rate, blood oxygen, fitness), quick 7-minute workouts, progress monitoring with trend analysis, and seamless syncing with Apple Health. Users can also export their data.

Can Cardiio be used for medical purposes?

No, Cardiio is intended for informational purposes only and is not for medical use. If you have any concerns about your heart health, it is essential to consult with a healthcare professional.