# Blood Oxygen Level vs SugarSentry

The clearest difference is ads: SugarSentry at none against Blood Oxygen Level's shown. SugarSentry also leads on update cadence (every 4 days vs every 6 weeks). Blood Oxygen Level's advantage is iOS requirement (15 vs 26.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Blood Oxygen Level ships an update every 6 weeks, SugarSentry every 4 days. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Blood Oxygen Level | SugarSentry |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (2K ratings)](https://appshunter.io/ios/app/blood-oxygen-level/id1582509614/reviews)** | — |
| Number of ratings | **2K** | — |
| Positive reviews | 22.5% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Every 4 days** |
| Monetization | Ad-supported | — |
| Size | 38 MB | 6 MB |
| Requires iOS | **15** | 26.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 17+ |
| Developer | [Enrique Villahermosa Juara](https://appshunter.io/developer/1581153213) | [Tarmo Sari](https://appshunter.io/developer/6807111138) |

## What reviewers say

### Blood Oxygen Level

[App page](https://appshunter.io/ios/app/blood-oxygen-level/id1582509614)

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.

**Highlights:** Record pulse measurements, Record blood oxygen levels, Daily measurement tracking, View statistics over time, Simple data entry

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

**In-app purchases:** none

**What reviewers like**

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

**What reviewers complain about**

- 🐛 Doesn't record anything
- 🐛 Flickering and freezing issues
- 🔋 Ads make it unusable
- 🐛 Doesn't give accurate readings
- 🐛 Doesn't sync with devices

**Reported bugs**

- Doesn't record or track oxygen levels accurately
- Compatibility issues with newer devices
- Unexpected charges and sign-ups to other services

**Requested features**

- Add a notes section for each entry
- Improve instructions on using the app
- Provide an ad-free subscription option


### SugarSentry

[App page](https://appshunter.io/ios/app/sugarsentry/id6807111136)

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

**In-app purchases:** none


## Frequently asked questions

### Is Blood Oxygen Level free?

Blood Oxygen Level is free to download, with no in-app purchases.

### Is SugarSentry free?

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

### Do Blood Oxygen Level or SugarSentry have ads?

Blood Oxygen Level shows ads; SugarSentry does not.

### Which is updated more often, Blood Oxygen Level or SugarSentry?

Blood Oxygen Level ships an update every 6 weeks, and SugarSentry every 4 days. Most recently, Blood Oxygen Level was updated on November 7, 2026 and SugarSentry on October 31, 2026.

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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.*