# iThermonitor vs Blood Oxygen App

The clearest difference is rating: Blood Oxygen App at 4.6 against iThermonitor's 2.7. Blood Oxygen App also leads on ratings volume (31K vs 314) and update cadence (every 2 weeks vs every 2 months). iThermonitor's advantage is in-app purchases (none vs 14) and iOS requirement (10.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Blood Oxygen App sells 10 in-app purchases, starting at $2.99 per 7 days. iThermonitor asks for nothing beyond the download.

Blood Oxygen App holds the better App Store score, 4.6 against 2.7. That said, the two scores are not equally well evidenced: Blood Oxygen App has 31K ratings behind it against 314, so its average is the more settled of the two. Written reviews point the same way: 15% of iThermonitor's written reviews are positive against 26% of Blood Oxygen App's.

iThermonitor ships an update every 2 months, Blood Oxygen App every 2 weeks. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | iThermonitor | Blood Oxygen App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (314 ratings)](https://appshunter.io/ios/app/ithermonitor/id696637855/reviews) | **[4.6 (31K ratings)](https://appshunter.io/ios/app/blood-oxygen-app/id1541992656/reviews)** |
| Number of ratings | 314 | **31K** |
| Positive reviews | 15.2% of reviews | **25.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Freemium |
| Best chart rank | #136 | **#32** |
| Size | 53 MB | 317 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Age rating | 12+ | 12+ |
| Developer | [Raiing Medical Company](https://appshunter.io/developer/543439703) | [AboutMe Apps, Inc.](https://appshunter.io/developer/1088980079) |

## What reviewers say

### iThermonitor

[App page](https://appshunter.io/ios/app/ithermonitor/id696637855)

**Currently charting:** #136 Top Free · Medical (US App Store)

Continuously monitor your child's temperature with real-time data collection and analysis. Receive high temperature alerts and access expert fever management information. Track temperature trends and sync data with your health app for comprehensive care.

**Highlights:** 24/7 temperature monitoring, Real-time high temperature alerts, Temperature trend charting, Professional data analysis, Fever management information, Multi-child support, Health app integration

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- ✅ Accurate temperature readings when working properly
- 🛡️ Effective fever monitoring without disturbing sleep
- 📱 Remote monitoring capability (when functioning)
- 🔔 Customizable temperature alerts and notifications
- ⏱️ Long-term reliability for some users (5+ years)

**What reviewers complain about**

- ❌ Requires external hardware device not clearly disclosed
- 🔗 Broken purchase links and unavailable sensors
- 📉 Product appears discontinued or abandoned
- 🚫 Misleading app store description and marketing
- 🔌 Requires proximity to device (5-10 feet range)

**Reported bugs**

- App crashes immediately after login
- Cannot enter birthdate in profile setup
- Remote mirroring functionality broken after updates
- Device connection wheel spins indefinitely
- Password reset feature non-functional

**Requested features**

- Apple Watch native integration and complications
- Cloud synchronization and multi-device mirroring
- Expanded temperature range settings (below 95°F)
- Selective alert controls (high/low temperature separately)
- Data export in text/CSV format instead of images


### Blood Oxygen App

[App page](https://appshunter.io/ios/app/blood-oxygen-app/id1541992656)

**Currently charting:** #32 Top Grossing · Medical (US App Store)

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.

**Highlights:** Blood oxygen monitoring, Heart rate estimation via camera, Apple Watch sync, Data logging and export (PDF), Box breathing exercises, Sleep reports

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium features set | $2.99 | per 7 days |
| Pulse oximeter for Apple Watch | $9.99 | per month |
| Premium month | $9.99 | per month |
| Premium month | $12.99 | per month |
| Premium features (all) | $19.99 | per year |
| Premium | $19.99 | per year |
| Premium features set | $24.99 | per year |
| Premium features set | $24.99 | per year |
| Blood Oxygen＋Body Temperature | $29.99 | per year |
| Premium year | $39.99 | per year |

**What reviewers like**

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

**What reviewers complain about**

- ❌ 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

**Reported bugs**

- App crashes and freezes frequently
- Inaccurate heart rate and oxygen level readings
- Compatibility issues with certain Apple Watch models

**Requested features**

- Add audible/vibration alerts for low oxygen levels
- Improve automatic oxygen level monitoring
- Provide more control over reading frequency


## Frequently asked questions

### Is iThermonitor free?

iThermonitor is free to download, with no in-app purchases.

### Is Blood Oxygen App free?

Blood Oxygen App is free to download, with in-app purchases available.

### Which has better reviews, iThermonitor or Blood Oxygen App?

Blood Oxygen App is rated higher. iThermonitor averages 2.7 out of 5 from 314 ratings, while Blood Oxygen App averages 4.6 from 31K ratings.

### Do iThermonitor or Blood Oxygen App have ads?

Neither iThermonitor nor Blood Oxygen App shows ads.

### Which is updated more often, iThermonitor or Blood Oxygen App?

iThermonitor ships an update every 2 months, and Blood Oxygen App every 2 weeks. Most recently, iThermonitor was updated on October 26, 2026 and Blood Oxygen App on October 27, 2026.

### Which is more popular, iThermonitor or Blood Oxygen App?

iThermonitor currently peaks at #136 in the App Store charts, and Blood Oxygen App at #32. Chart position reflects recent download velocity rather than total install base.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*