# Beyond Oximeter vs Calochron

The clearest difference is update cadence: Calochron at every 2 weeks against Beyond Oximeter's every 3 months. Beyond Oximeter's advantage is iOS requirement (11.0 vs 16.0). On price, ads, 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.

Beyond Oximeter ships an update every 3 months, Calochron every 2 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Beyond Oximeter | Calochron |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.2 (90 ratings)](https://appshunter.io/ios/app/beyond-oximeter/id1605638778/reviews)** | — |
| Number of ratings | **90** | — |
| Positive reviews | 13.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 20 MB | 2 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Intelliworks, LLC](https://appshunter.io/developer/1448088763) | [COLE NORMAN VANDRIMLEN](https://appshunter.io/developer/6777298970) |

## What reviewers say

### Beyond Oximeter

[App page](https://appshunter.io/ios/app/beyond-oximeter/id1605638778)

Monitor your vital signs like SpO2, pulse, and respiratory rate in real-time. Record, share, and view trend graphs of your measurements. Requires a Bluetooth-enabled device to function.

**Highlights:** Real-time SpO2 and pulse rate monitoring, Respiratory rate and PI tracking, Vital sign trend graphs, Data recording and playback, Share measurement reports, Apple Health sync

**In-app purchases:** none

**What reviewers like**

- 👍 Device hardware seems good
- 👍 Guest mode works without issue
- 👍 Syncs well with Apple Health
- 👍 Easy to use app
- 👍 Transfers data to Apple Health without issues

**What reviewers complain about**

- 🐛 Cannot create account
- 🐛 Cannot change password
- 🐛 Password too long or not strong enough
- 🐛 Bluetooth functionality does not work
- 🐛 App is unstable and crashes

**Reported bugs**

- Cannot change password
- Cannot create an account
- Password requirements are too strict or unclear
- Bluetooth pairing issues
- App freezes or crashes

**Requested features**

- Show tracings on the report
- Allow recording notes for readings
- App for Apple Watch
- More history at a glance
- Dark mode/blackout feature for screen brightness


### Calochron

[App page](https://appshunter.io/ios/app/calochron/id6777298968)

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

**In-app purchases:** none


## Frequently asked questions

### Is Beyond Oximeter free?

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

### Is Calochron free?

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

### Do Beyond Oximeter or Calochron have ads?

Neither Beyond Oximeter nor Calochron shows ads.

### Which is updated more often, Beyond Oximeter or Calochron?

Beyond Oximeter ships an update every 3 months, and Calochron every 2 weeks. Most recently, Beyond Oximeter was updated on November 3, 2026 and Calochron 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.*