# OZ Institute vs eClass.mn Staff

The clearest difference is update cadence: eClass.mn Staff at every 5 days against OZ Institute's every 2 months. eClass.mn Staff also leads on device support (3 vs 1) and iOS requirement (15.5 vs 18.0). On price, 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.

OZ Institute ships an update every 2 months, eClass.mn Staff every 5 days. The most recent releases landed on October 8, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | OZ Institute | eClass.mn Staff |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Size | 57 MB | 47 MB |
| Requires iOS | 18.0 | **15.5** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Batbuyan Ulziibat](https://appshunter.io/developer/1851420456) | [Otgondorj Taij](https://appshunter.io/developer/1435119360) |

## What reviewers say

### OZ Institute

[App page](https://appshunter.io/ios/app/oz-institute/id6755034240)

**Features:** macOS Compatibility

**In-app purchases:** none


### eClass.mn Staff

[App page](https://appshunter.io/ios/app/eclassmn-staff/id6793029907)

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

**In-app purchases:** none


## Frequently asked questions

### Is OZ Institute free?

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

### Is eClass.mn Staff free?

eClass.mn Staff is free to download, with no in-app purchases.

### Do OZ Institute or eClass.mn Staff have ads?

Neither OZ Institute nor eClass.mn Staff shows ads.

### Which is updated more often, OZ Institute or eClass.mn Staff?

OZ Institute ships an update every 2 months, and eClass.mn Staff every 5 days. Most recently, OZ Institute was updated on October 8, 2026 and eClass.mn Staff on October 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.*