# Cardiio: Heart Rate Monitor — HR checker & beat analyzer

> Mobile heart rate monitor and health tracker with workout features. (iPhone/iPad app by Cardiio, Inc..)

- Source: https://appshunter.io/ios/app/cardiio-heart-rate-monitor/id542891434 (this page in markdown: same URL + `.md`)
- Developer: [Cardiio, Inc.](https://appshunter.io/developer/534956039)
- Category: Health & Fitness, Lifestyle
- Price: Free with in-app purchases
- Rating: 4.70/5 from 58,416 App Store ratings · 2,017 written reviews indexed
- Age rating: 12+
- Requires: iOS 16.6 · 101 MB
- Languages: American English, Dutch, French (France), German (Germany), Italian, Japanese, Korean, European Portuguese, Russian, Chinese (Simplified, China) and 3 more
- Released: 2012-08-09
- Data updated: 2026-08-26
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/cardiio-heart-rate-monitor/id542891434/reviews.md

## What is Cardiio?

Track Your Heart Health for Free, Anytime, Anywhere with Cardiio. Join over 9.84 million users who trust Cardiio for accurate, easy heart health monitoring. Transform your iPhone into a powerful health tool — track your heart rate, boost fitness, and gain valuable insights, all with just your phone.


Key Features:

1. Instant Heart Rate Monitoring—Accurate and Effortless
• Place your finger on the camera for a precise reading in seconds.
• Featured on CBS’s The Doctors and ABC News.


2. All-in-One Health Tracking Made Simple
• Measure heart rate, blood oxygen, and fitness effortlessly.
• Compare your progress with others in your age, gender, and region for motivation.


3. Quick Workouts to Strengthen Your Heart
• Short, high-intensity 7-minute workouts that boost overall health.


4. Stay in Control—Monitor Progress and Build Healthy Habits
• Unlimited heart rate tracking to stay on top of your health.
• Analyze daily, weekly, and monthly trends—sync seamlessly with Apple Health.
• Export your data easily for personal records or to share with a doctor.


Ready for Deeper Insights? Unlock Cardiio PRO for the next level:

• In-depth pulse waveform analysis
• Blood pressure estimates and detailed oxygen tracking
• Tailored calorie burn estimator for your activities
• Personalized health comparisons by age and sex
• Hypothetical life expectancy based on your heart trends


Why Choose Cardiio?

Cardiio combines simplicity with advanced tracking—perfect for anyone seeking accurate, no-fuss health monitoring. Enjoy a complete set of free features, with the option to unlock more when you’re ready for a deeper dive.


What the Press is Saying:

PC Magazine: "Simple, beautiful, and pretty slick."
Cult of Mac: "Cardiio is one of those apps that wows you..."
Lifehacker: "It’s a little mind-blowing..."


How to Get the Most Out of Cardiio:

Track Daily: Start each day by checking your heart rate to set a baseline.
Follow Your Progress: Use the dashboard to track trends and adjust your goals.
Upgrade for More: Enjoy powerful free features or upgrade when you want even deeper insights.


Download Cardiio now and take charge of your heart health!


Disclaimer:

NOT FOR MEDICAL USE: Cardiio is intended for informational purposes only. If you have concerns about your heart health, consult a healthcare professional.


Additional Information:

Terms of service: https://www.cardiio.app/terms-of-use
Privacy policy: https://www.cardiio.app/privacy-policy

## Key features

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

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Weekly Pro Upgrade | $6.99 | per 7 days |
| Annual Pro Upgrade | $39.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Blood Oxygen Tracking | $6.99 | one-time |
| Specific Heart Rate Pack | $4.99 | one-time |
| Hypothetical Life Expectancy Pack | $4.99 | one-time |
| Target Heart Rate Pack | $4.99 | one-time |
| Calorie-Burn Estimator | $4.99 | one-time |
| Full Pro Upgrade! | $9.99 | one-time |
| Coach Max | $1.99 | one-time |
| Pulse Waveform Pack | $7.99 | one-time |
| Remove Promo Banner | $4.99 | one-time |


## What do users think of Cardiio?

Overall sentiment: positive

**Pros**

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

**Cons**

- 🐛 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

**Commonly reported bugs**

- App crashes or freezes
- Inaccurate or missing heart rate data
- Inability to save or export readings

**Most requested features**

- Customizable workout options
- Support for irregular heart rhythms
- Better historical data tracking
- Gender-neutral setup options

## Recent user reviews (10 of 2,017)

All indexed reviews: https://appshunter.io/ios/app/cardiio-heart-rate-monitor/id542891434/reviews.md

### 5/5 — Feeling odd

*2026-08-09, version 4.1.7*

A while ago I was feeling a little odd. I used your heart app and could see that my heart was missing beats and was able to call paramedics who came and dealt with me. Brilliant

### 1/5 — All it wants is money

*2026-08-01, version 4.1.7*

Waste of time. Need to pay to use.

### 4/5 — Mostly accurate

*2026-07-18, version 4.1.7*

I use this app to track my waking heart rate and the times when I exercise. Most of the time, it’s easy to use and to get an accurate reading. Sometimes, it can read that my finger is blocking the camera lens, but it won’t give me an accurate reading. Other times it has difficulty locking onto my finger at all. So, mixed review.

### 1/5 — Slow and Hard to Work With

*2026-07-14, version 4.1.7*

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.

### 1/5 — Poor signal quality?

*2026-07-07, version 4.1.7*

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.

### 1/5 — Doesn’t work

*2026-07-03, version 4.1.7*

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.

### 1/5 — Didn’t work

*2026-07-01, version 4.1.7*

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.

### 5/5 — Makes it simple!

*2026-06-30, version 4.1.7*

I enjoy checking my bpm with this makes it so easy

### 1/5 — Русский

*2026-06-12*

При обновлении пропал русский язык. Верните.

### 5/5 — Tracker

*2026-05-30, version 4.1.5*

Great for measuring heart rate:)

## Frequently asked questions about Cardiio

### 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.

## Version history (last 5 releases)

### 4.1.7 — 2026-06-26

- Performance improvements 
- Bug fixes

### 4.1.6 — 2026-06-10

- Performance improvements 
- Bug fixes

### 4.1.5 — 2026-02-28

- Performance improvements 
- Bug fixes

### 4.1.4 — 2025-12-30

- Performance improvements 
- Bug fixes

### 4.1.3 — 2025-10-27

- Performance improvements 
- Bug fixes

## Apps similar to Cardiio

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Instant Heart Rate: HR Monitor](https://appshunter.io/ios/app/instant-heart-rate-hr-monitor/id409625068) | 4.9 (228,890) | Free | Health & Fitness |
| [Welltory: Stress & Heart Rate](https://appshunter.io/ios/app/welltory-stress-and-heart-rate/id1074367771) | 4.7 (131,900) | Free | Health & Fitness |
| [InPulse - Heart Rate Monitor](https://appshunter.io/ios/app/inpulse-heart-rate-monitor/id1489944782) | 4.6 (177,268) | Free | Health & Fitness |
| [Heart Rate Monitor - Pulse BPM](https://appshunter.io/ios/app/heart-rate-monitor-pulse-bpm/id1216751824) | 4.6 (129,853) | Free | Health & Fitness |
| [Heartify: Heart Health Monitor](https://appshunter.io/ios/app/heartify-heart-health-monitor/id1546156891) | 4.7 (119,045) | Free | Health & Fitness |
| [Pulsedo: Heart Rate Monitor](https://appshunter.io/ios/app/pulsedo-heart-rate-monitor/id1528974993) | 4.5 (3,281) | Free | Health & Fitness |

## More apps by Cardiio, Inc.

- [Themes: Widget, Icons Packs 15](https://appshunter.io/ios/app/themes-widget-icons-packs-15/id1533047121)

All apps by Cardiio, Inc.: https://appshunter.io/developer/534956039

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*