# Delta Мониторинг vs ОКО

The clearest difference is update cadence: Delta Мониторинг at monthly against ОКО's every 4 months. Delta Мониторинг also leads on iOS requirement (9.0 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.

Delta Мониторинг ships an update monthly, ОКО every 4 months. The most recent releases landed on October 25, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Delta Мониторинг | ОКО |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 4 months |
| Size | 49 MB | 60 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DELTA-SISTEMY BEZOPASNOSTI, OOO](https://appshunter.io/developer/1016872182) | [ORG DIKIDI](https://appshunter.io/developer/1057010744) |

## What reviewers say

### Delta Мониторинг

[App page](https://appshunter.io/ios/app/delta/id1450241101)

**Features:** macOS Compatibility

**In-app purchases:** none


### ОКО

[App page](https://appshunter.io/ios/app/id6748225698)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Delta Мониторинг free?

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

### Is ОКО free?

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

### Do Delta Мониторинг or ОКО have ads?

Neither Delta Мониторинг nor ОКО shows ads.

### Which is updated more often, Delta Мониторинг or ОКО?

Delta Мониторинг ships an update monthly, and ОКО every 4 months. Most recently, Delta Мониторинг was updated on October 25, 2026 and ОКО 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.*