# iClerk vs Optim System app

The clearest difference is iOS requirement: iClerk at 13.6 against Optim System app's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

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

iClerk ships an update weekly, Optim System app every 9 days. The most recent releases landed on September 26, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | iClerk | Optim System app |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 9 days |
| Size | 43 MB | 44 MB |
| Requires iOS | **13.6** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [XIOTS](https://appshunter.io/developer/1647563992) | [Optim Systems, Ltd.](https://appshunter.io/developer/1713704866) |

## What reviewers say

### iClerk

[App page](https://appshunter.io/ios/app/iclerk/id1640006274)

**Features:** macOS Compatibility

**In-app purchases:** none


### Optim System app

[App page](https://appshunter.io/ios/app/optim-system-app-weopsy/id6470450913)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iClerk free?

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

### Is Optim System app free?

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

### Do iClerk or Optim System app have ads?

Neither iClerk nor Optim System app shows ads.

### Which is updated more often, iClerk or Optim System app?

iClerk ships an update weekly, and Optim System app every 9 days. Most recently, iClerk was updated on September 26, 2026 and Optim System app on October 4, 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.*