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Best O2 Monitor Free Apps

250+ iOS apps curated and reviewed

4.2 avg rating
20 free apps
Updated August 2026

With an average user rating of 4.2★, the o2 monitor free category is one of the App Store's strongest. Browse all 250+ apps we track, sorted so the most loved ones surface first.

Compare top O2 Monitor Free Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Blood Oxygen AppBlood Oxygen AppFree4.6★ (31K)NoYesAug 2026
2Blood Oxygen LevelBlood Oxygen LevelFree4.3★ (2K)YesNoAug 2026
3Heart Rate Monitor - Pulse BPMHeart Rate Monitor - Pulse BPMFree4.6★ (130K)YesYesAug 2026
4Oximeter - Track Oxygen SpO2Oximeter - Track Oxygen SpO2Free4.5★ (466)NoYesAug 2026
5Blood Oxygen Level: AnalyzerBlood Oxygen Level: AnalyzerFree3.9★ (190)NoYesAug 2026
6Instant Heart Rate: HR MonitorInstant Heart Rate: HR MonitorFree4.9★ (229K)YesYesAug 2026
7Pulse Plus: Heart Rate MonitorPulse Plus: Heart Rate MonitorFree4.4★ (3.6K)YesYesAug 2026
8Blood Oxygen | O2 Monitor app+Blood Oxygen | O2 Monitor app+Free4.6★ (423)NoYesAug 2026

Top Picks for O2 Monitor Free

Blood Oxygen App#1

Blood Oxygen App by AboutMe Apps, Inc.

SpO2 Level Monitor・Heart Rate
Editor's Choice
🏥 Medical
4.6😞(31K ratings)
FreeIn-App Purchases
#24in Medical
Blood Oxygen App screenshot 1
Blood Oxygen App screenshot 2
Blood Oxygen App screenshot 3
Blood Oxygen App screenshot 4
Blood Oxygen App screenshot 5
Blood Oxygen App screenshot 6

Monitor blood oxygen levels and heart rate using your phone's camera or by syncing with your Apple Watch. Track vital signs, share data with your doctor, and access curated health articles. Includes breathing exercises and sleep reports.

What We Love

  • ⭐ Awesome app
  • ⭐ Very easy to use
  • ⭐ Helpful for monitoring health conditions
  • ⭐ Detailed data logging

Room to Improve

  • ❌ Doesn't accurately measure blood oxygen levels
  • ❌ Requires premium subscription for key features
  • ❌ Inconsistent and unreliable performance
Blood Oxygen Level#2

Blood Oxygen Level by Enrique Villahermosa Juara

Record pulse and oxygen level
Strong Contender
🏥 Medical
4.3😞(2K ratings)
FreeAds
Blood Oxygen Level screenshot 1
Blood Oxygen Level screenshot 2
Blood Oxygen Level screenshot 3
Blood Oxygen Level screenshot 4
Blood Oxygen Level screenshot 5

Easily record your daily pulse and blood oxygen levels. Track your health statistics over time with simple data entry and clear visualizations. Requires an external device like a pulse oximeter or smartwatch for measurements.

What We Love

  • 👍 Simple and easy interface
  • 🚀 Impressive work
  • 💡 Helpful for recording health conditions

Room to Improve

  • 🐛 Doesn't record anything
  • 🐛 Flickering and freezing issues
  • 🔋 Ads make it unusable
Heart Rate Monitor - Pulse BPM#3

Heart Rate Monitor - Pulse BPM by Zane

Pulse: Step,Health HR&Oximeter
Worth Considering
💪 Health & Fitness
4.6😐(130K ratings)
FreeAdsIn-App Purchases
Heart Rate Monitor - Pulse BPM screenshot 1
Heart Rate Monitor - Pulse BPM screenshot 2
Heart Rate Monitor - Pulse BPM screenshot 3
Heart Rate Monitor - Pulse BPM screenshot 4

Easily monitor your heart rate, track steps, and record vital health metrics like blood pressure and body temperature. Save and visualize your health data, set reminders, and share your progress with friends and family. This app provides convenient health insights for daily well-being.

What We Love

  • 👍 Accurate heart rate measurements
  • 📊 Helpful for tracking health conditions
  • 🗓️ Ability to save and review past readings
  • 💻 Easy to use interface

Room to Improve

  • 📺 Excessive advertisements that interfere with usage
  • 🔒 Subscription required for full functionality
  • 🔢 Limited number of free daily measurements

More O2 Monitor Free apps to explore

4
Oximeter - Track Oxygen SpO2
Oximeter - Track Oxygen SpO2
Oximeter - Track Oxygen SpO2
Blood O2 Monitor Tracker
Free

Monitor and record your blood oxygen saturation (SpO2) levels with this personal health tracking app. It offers detailed analytics, daily wellness guides, and data export options. Sync your health data with Apple Health for a comprehensive overview.

Display, record, and view SpO2 dataDetailed analytics with data spikesNutrition and meditation guides
💪 Health & Fitness
(466)
free with in-app purchases
5
Blood Oxygen Level: Analyzer
Blood Oxygen Level: Analyzer
Blood Oxygen Level: Analyzer
O2, pulse calculator: Tracker
Free

Track your blood oxygen saturation levels and monitor changes over time. Log additional symptoms to gain a more comprehensive understanding of your condition. Supports multiple user profiles and synchronizes with HealthKit for pulse and oxygen data.

Oxygen saturation trackingSymptom loggingHistory of changes
🏥 Medical
(190)
subscription
6
Instant Heart Rate: HR Monitor
Instant Heart Rate: HR Monitor
Instant Heart Rate: HR Monitor
Pulse Tracker & Stress Test
Free

Measure your heart rate and stress levels accurately using your phone's camera. Track trends, view pulse waveforms, and utilize a StandUp test for fitness insights. Integrates with Apple Health.

Heart rate measurementStress level checkPulse waveform graphs
💪 Health & Fitness
(229K)
free with in-app purchases
7
Pulse Plus: Heart Rate Monitor
Pulse Plus: Heart Rate Monitor
Pulse Plus: Heart Rate Monitor
Blood Pressure・Oxygen Tracker
Free

Track your heart rate using your phone's camera with this easy-to-use app. It utilizes photoplethysmography to provide accurate pulse measurements and visualizes your data over time. Integrate with Apple Health and receive reminders to stay on top of your fitness goals.

Heart rate measurement via phone cameraPhotoplethysmography (PPG) technologyPersonalized measurement history dashboard
💪 Health & Fitness
(3.6K)
subscription
8
Blood Oxygen | O2 Monitor app+
Blood Oxygen | O2 Monitor app+
Blood Oxygen | O2 Monitor app+
Saturation Level + Pulse Rate
Free

Track your blood oxygen saturation (SpO2) and pulse rate daily. Log readings from your oximeter, monitor your normal range, and stay informed about your health. Features include a log diary, multi-profile support, and Apple Health synchronization.

Log oxygen saturation (SpO2) and pulse rateFast and accurate pulse measurementMulti-profile support for family members
🏥 Medical
(423)
freemium
9
InPulse - Heart Rate Monitor
InPulse - Heart Rate Monitor
InPulse - Heart Rate Monitor
Log Blood Pressure & Oxygen
Free

Monitor your heart rate using your iPhone's camera and log blood pressure and oxygen saturation. Receive daily wellness assessments, habit tracking, and emotional wellbeing tools. This app is for fitness and general wellness information.

Measure heart rate with cameraLog blood pressure and oxygenDaily wellness assessments
💪 Health & Fitness
(177K)
freemium
10
Blood Oxygen Tracker – SpO2
Blood Oxygen Tracker – SpO2
Blood Oxygen Tracker – SpO2
Pulse Oximeter & Heart Rate
Free
🏥 Medical
(0)
11
HushCam: Baby Monitor
HushCam: Baby Monitor
HushCam: Baby Monitor
End-to-end encrypted
Free
🌟 Lifestyle
(0)
12
Heart Rate Tracker: PulseCheck
Heart Rate Tracker: PulseCheck
Heart Rate Tracker: PulseCheck
Pulsebit Monitor & Health HR
Free
🌟 Lifestyle
(0)
13
Pulse Monitor-Blood Sugar
Pulse Monitor-Blood Sugar
Pulse Monitor-Blood Sugar
by PIECES OF WOOD CO., LIMITED
Free

This app offers precise heart rate and blood pressure monitoring, presenting data through intuitive charts. It also provides a rich library of health articles on various topics to support a healthier lifestyle.

Precise heart rate measurementBlood pressure tracking and analysisIntuitive data charts
🔧 Utilities
(1)
free
14
OPL Monitor
OPL Monitor
OPL Monitor
App for Car Diagnostic
Free

Monitor DPF particulate filter parameters for specific Opel/Vauxhall models using an ELM327 compatible adapter. View real-time data for various engine codes on your device.

DPF particulate filter monitoringELM327, iCar, vLinker compatibilityReal-time parameter reading
🔧 Utilities
(22)
free with in-app purchases
15
Monitor GPS
Monitor GPS
Monitor GPS
by MOBILE NET POSA, INC.
Free

This companion app manages and controls compatible smartwatches. It enables real-time location tracking, video calls, messaging, and alerts for events like SOS or low battery. Users can also remotely adjust smartwatch settings.

Real-time smartwatch location trackingVideo and in-app messagingEvent alerts (SOS, low battery, geo-fence)
🌟 Lifestyle
(1)
free
16
Device Monitor & Diagnostics +
Device Monitor & Diagnostics +
Device Monitor & Diagnostics +
Phone settings app for iPhone
Free

Gain deep insights into your iPhone or iPad's hardware and performance. Monitor battery health, storage, CPU/GPU, display, network, and sensors. Run diagnostics and generate detailed reports.

Detailed device specificationsReal-time battery monitoringStorage and RAM usage tracking
🔧 Utilities
(1)
free with in-app purchases
17
Miko Baby: Smart Monitor
Miko Baby: Smart Monitor
Miko Baby: Smart Monitor
2K HD Video & Cry Detection
Free
🌟 Lifestyle
(0)
18
Heart Monitor AI: Blood Sugar
Heart Monitor AI: Blood Sugar
Heart Monitor AI: Blood Sugar
Heart Rate, BP, SpO2 & Health
Free

Monitor your daily wellness with this app. Track heart rate, blood pressure, blood sugar, and weight using your device. View clear data trends and access helpful wellness articles.

Heart rate check via device cameraRecord blood pressure, blood sugar, weight, BMIInteractive data trend charts
💪 Health & Fitness
(26)
subscription
19
O2 Lite Pro
O2 Lite Pro
O2 Lite Pro
Vehicle monitoring
Free
💼 Business
(0)
20
O2 Advance
O2 Advance
O2 Advance
Vehicle monitoring
Free
💼 Business
(0)

FAQ about O2 Monitor Free

What are the best o2 monitor free apps for iPhone?
Blood Oxygen App tops our o2 monitor free apps ranking as of August 2026, with a 4.6-star average from 31K App Store ratings, and it's free to download.
Blood Oxygen App has no ads and offers in-app purchases, according to its App Store listing as of August 2026.
We track 250+ o2 monitor free apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.
This app allows you to monitor your blood oxygen levels and heart rate. You can use your phone's camera to estimate heart rate and sync with your Apple Watch for blood oxygen readings. It also provides features like data logging, export options, breathing exercises, and sleep reports.
You can monitor your blood oxygen and heart rate by syncing with your Apple Watch. Additionally, the app can estimate your heart rate using your phone's camera. The data can then be logged and tracked within the app.