Best O2 Monitor Free Apps

250+ iOS apps curated and reviewed

4.2 avg rating
18 free apps
Updated September 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 (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Blood Oxygen AppBlood Oxygen AppFree4.6★ (31K)NoYesSep 2026
2Blood Oxygen Level: AnalyzerBlood Oxygen Level: AnalyzerFree3.9★ (190)NoYesSep 2026
3Oximeter - Track Oxygen SpO2Oximeter - Track Oxygen SpO2Free4.5★ (547)NoYesSep 2026
4Heart Rate Monitor - Pulse BPMHeart Rate Monitor - Pulse BPMFree4.6★ (130K)YesYesSep 2026
5Blood Oxygen LevelBlood Oxygen LevelFree4.3★ (2K)YesNoSep 2026
6Instant Heart Rate: HR MonitorInstant Heart Rate: HR MonitorFree4.9★ (229K)YesYesSep 2026
7GererseulGererseulFreeNoYesSep 2026
8InPulse - Heart Rate MonitorInPulse - Heart Rate MonitorFree4.6★ (177K)NoYesSep 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
#28in 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
  • ❌ Deceptive marketing and false advertising
  • ❌ No way to contact customer support
Blood Oxygen Level: Analyzer#2

Blood Oxygen Level: Analyzer by Svetlana Rabosh

O2, pulse calculator: Tracker
Strong Contender
🏥 Medical
3.9(190 ratings)
FreeIn-App Purchases
Blood Oxygen Level: Analyzer screenshot 1
Blood Oxygen Level: Analyzer screenshot 2
Blood Oxygen Level: Analyzer screenshot 3
Blood Oxygen Level: Analyzer screenshot 4
Blood Oxygen Level: Analyzer screenshot 5
Blood Oxygen Level: Analyzer screenshot 6

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.

More O2 Monitor Free apps to explore

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 September 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 September 2026.
We track 250+ o2 monitor free apps on the iOS App Store as of September 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.