# Optim System app vs Zairos

Optim System app and Zairos are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both ship on a similar rhythm, roughly every 9 days. The most recent releases landed on October 4, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Optim System app | Zairos |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 days | Every 9 days |
| Size | 44 MB | 67 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Optim Systems, Ltd.](https://appshunter.io/developer/1713704866) | [Equals Money PLC](https://appshunter.io/developer/535756525) |

## What reviewers say

### Optim System app

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Zairos

[App page](https://appshunter.io/ios/app/zairos/id6677031569)

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

**In-app purchases:** none


## Frequently asked questions

### Is Optim System app free?

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

### Is Zairos free?

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

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

Neither Optim System app nor Zairos shows ads.

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

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