# O vs Clinflash eSign

The clearest difference is update cadence: O at every 4 weeks against Clinflash eSign's every 2 months. Clinflash eSign's advantage is iOS requirement (12.0 vs 15.0). 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.

O ships an update every 4 weeks, Clinflash eSign every 2 months. The most recent releases landed on October 12, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | O | Clinflash eSign |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 2 months |
| Size | 28 MB | 41 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, 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) | [Clinflash Healthcare Technology (Jiaxing) Co.,Ltd](https://appshunter.io/developer/1174669463) |

## 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


### Clinflash eSign

[App page](https://appshunter.io/ios/app/clinflash-esign/id6448827413)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is Clinflash eSign free?

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

### Do O or Clinflash eSign have ads?

Neither O nor Clinflash eSign shows ads.

### Which is updated more often, O or Clinflash eSign?

O ships an update every 4 weeks, and Clinflash eSign every 2 months. Most recently, O was updated on October 12, 2026 and Clinflash eSign on September 11, 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.*