# CSO de Boog vs Aventus | Osiris

The clearest difference is update cadence: CSO de Boog at every 5 days against Aventus | Osiris's every 4 months. 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.

CSO de Boog ships an update every 5 days, Aventus | Osiris every 4 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | CSO de Boog | Aventus | Osiris |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 4 months |
| Size | 11 MB | 34 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Stichting  christelijk speciaal onderwijs Apeldoorn](https://appshunter.io/developer/1533235284) | [CACI bv](https://appshunter.io/developer/961337312) |

## What reviewers say

### CSO de Boog

[App page](https://appshunter.io/ios/app/cso-de-boog/id1533235282)

**Features:** macOS Compatibility

**In-app purchases:** none


### Aventus | Osiris

[App page](https://appshunter.io/ios/app/aventus-osiris/id1632011986)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CSO de Boog free?

CSO de Boog is free to download, with no in-app purchases.

### Is Aventus | Osiris free?

Aventus | Osiris is free to download, with no in-app purchases.

### Do CSO de Boog or Aventus | Osiris have ads?

Neither CSO de Boog nor Aventus | Osiris shows ads.

### Which is updated more often, CSO de Boog or Aventus | Osiris?

CSO de Boog ships an update every 5 days, and Aventus | Osiris every 4 months. Most recently, CSO de Boog was updated on November 3, 2026 and Aventus | Osiris on November 3, 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.*