Cardiio: Heart Rate Monitor

Name: Cardiio: Heart Rate Monitor
Rating: 4.7 (58398 reviews)
Author: Cardiio, Inc.

By: Cardiio, Inc. App

HR checker & beat analyzer

Overview

Version:

4.1.7

Last updated: 2026-06-26

Features & Capabilities

Cardiio: Heart Rate Monitor turns your iPhone into a health-tracking tool. Instantly measure heart rate and blood oxygen with the camera, track daily/weekly/monthly trends, and power quick 7-minute workouts. Export your data and sync with Apple Health for seamless insight.

Cardiio PRO adds in-depth pulse waveform analysis, blood pressure estimates, calorie burn estimates, and personalized health comparisons. Note: Not medical advice; consult a professional for health concerns.

User Growth & Download Statistics

App Sports Data Privacy & Security

By:

Cardiio, Inc.

Rating:

4.70

(58,398) 8 new ratings

Version:

4.1.7 Last updated: 2026-06-26

Version code:

886991884

Creation date:

2012-08-09

Compatible devices:

Size:

100.72MB

URLs:

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-07-18

Compare stats and ranking:

Ranking

# 5,506 ▼ 15

Other rankings

#10 in heart keyword 8 #45 in rating keyword 16 ▲ 10#63 in monitor keyword 51 ▼ 34

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.

Developed by:

Cardiio, Inc.

Apple Apps Store

https://apps.apple.com/us/app/cardiio-heart-rate-monitor/id542891434

User Reviews

Users overall see value in Cardiio for on-the-go heart-rate monitoring and peace of mind, especially for heart conditions. However, the app is plagued by reliability issues (poor signal quality, frequent failed readings), device compatibility problems with newer iPhones, and troubling billing/support experiences. Stability and connectivity problems further detract from the experience. The strongest positives center on convenience and potential safety benefits; the strongest negatives center on inconsistent performance and billing woes.

Pros

Convenient to check heart rate anywhere without needing a smartwatch
Quick and simple pulse checks, easy to use anywhere
Helps monitor heart rate and can provide warnings for abnormal values (beneficial for heart conditions)
Can offer peace of mind and even calmness during stress or overwhelm

Cons

Readings are frequently unreliable and require stillness; poor signal quality often prevents registration
Multiple reports of needing many attempts (8–10 tries) to get a reading
Compatibility issues with newer iPhone models (e.g., iPhone 17 Pro Max) causing poor signal or failures
Billing and subscription problems (free trial charges, unexpected charges, and perceived unresponsive support)
App instability/crashes (e.g., crashes in insight tab or when saving a heartbeat) and connectivity issues with other devices

Recent reviews

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.

by en*****, 2026-07-14

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.