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Cardiio: Heart Rate Monitor

Cardiio: Heart Rate Monitor

HR checker & beat analyzer

58K ratings
2024 reviews
🌟 Lifestyle
💪 Health & Fitness
Free
In-App Purchases

Details

Released
August 9, 2012
Updated
October 18, 2026

Features

Developer

Cardiio, Inc.
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Cardiio: Heart Rate Monitor video #1 for iPhone
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Cardiio: Heart Rate Monitor screenshot #7 for iPhone
Cardiio: Heart Rate Monitor screenshot #8 for iPhone
Cardiio: Heart Rate Monitor screenshot #9 for iPhone
iphone
ipad
🧾$1.99 - $9.99
In-App Purchase↘︎
📌Ready
Reviews summary↘︎
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❓5 answered
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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
Show original description

What users say about Cardiio

Reviews of Cardiio are mostly positive: the Health & Fitness app is rated 4.7/5 from 58K App Store ratings. What users like most: accurate heart rate monitoring, convenient and easy to use. Top complaints: inconsistent or unreliable readings, difficulty getting readings after exercise. Summarized from real user reviews.

Positive things

  • 👍Accurate heart rate monitoring
  • 👍Convenient and easy to use
  • 👍Helpful for monitoring heart health conditions
  • 👍Useful workout features
  • 👍Integrates well with Apple Health

Negative things

  • 🐛Inconsistent or unreliable readings
  • 🐛Difficulty getting readings after exercise
  • 🐛Compatibility issues with newer iPhone models
  • 💰Paid features not worth the cost
  • 🔒Privacy concerns with data sharing
See all reviews

What's New in Cardiio

4.1.8

October 18, 2026

- Performance improvements - Bug fixes

10

Subscriptions & In-App Purchases

Weekly Pro Upgrade

Get unlimited pro features and tracking

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

User reviews

Most RecentHighest RatedLowest Rated

Not for cold hands

It works after a workout but can’t analyze my performance because it needs a resting heart rate to compare. And it can’t measure my heart rate at rest because my hands are too cold. I tried for a week before deleting.
CHCold hands warm heart

Oxygensensing

Add O2 sensing feature to BPM.
DDragloom

Great

I use it 5 times a week
BB2009

Tried to charge me for free trial

I have a$44 pending charge when it was a a free trial
HHerycich

Interesting concept that works

Unbelievable how accurate this is. I do this about once per week and show the results to my dr. Gives me peace of mind.
Bbobz911
See 2019 more reviews

Developer apps

Themes: Widget, Icons Packs 15
Themes: Widget, Icons Packs 15

Theme Pack Lock Screen Skin 14

🔧 Utilities

(15K)

Free
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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.