# O vs 艾瑞嘉CTMS

The clearest difference is update cadence: O at every 4 weeks against 艾瑞嘉CTMS's every 2 months. 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.

O ships an update every 4 weeks, 艾瑞嘉CTMS every 2 months. The most recent releases landed on August 27, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | O | 艾瑞嘉CTMS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 2 months |
| Size | 28 MB | 6 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [铨融 (苏州)医药科技开发有限公司](https://appshunter.io/developer/1253822764) | [UNIMED SCIENTIFIC,Inc](https://appshunter.io/developer/981824434) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-trial-plus/id1423521217)

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

**In-app purchases:** none


### 艾瑞嘉CTMS

[App page](https://appshunter.io/ios/app/ctms/id1551759482)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is 艾瑞嘉CTMS free?

艾瑞嘉CTMS is free to download, with no in-app purchases.

### Do O or 艾瑞嘉CTMS have ads?

Neither O nor 艾瑞嘉CTMS shows ads.

### Which is updated more often, O or 艾瑞嘉CTMS?

O ships an update every 4 weeks, and 艾瑞嘉CTMS every 2 months. Most recently, O was updated on August 27, 2026 and 艾瑞嘉CTMS on September 17, 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.*