# KAS Portal vs Atom Messenger

The clearest difference is update cadence: Atom Messenger at every 3 weeks against KAS Portal's every 2 months. KAS Portal's advantage is device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

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

KAS Portal ships an update every 2 months, Atom Messenger every 3 weeks. Both last shipped on October 27, 2026.

## The numbers

| Metric | KAS Portal | Atom Messenger |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 77 MB | 42 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [MINISTRY OF ECONOMY AND FINANCE](https://appshunter.io/developer/1507079609) | [igloocy s.r.l.](https://appshunter.io/developer/1691843040) |

## What reviewers say

### KAS Portal

[App page](https://appshunter.io/ios/app/kas-portal/id1662421665)

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

**In-app purchases:** none


### Atom Messenger

[App page](https://appshunter.io/ios/app/atom-messenger/id6450101210)

**In-app purchases:** none


## Frequently asked questions

### Is KAS Portal free?

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

### Is Atom Messenger free?

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

### Do KAS Portal or Atom Messenger have ads?

Neither KAS Portal nor Atom Messenger shows ads.

### Which is updated more often, KAS Portal or Atom Messenger?

KAS Portal ships an update every 2 months, and Atom Messenger every 3 weeks. Most recently, KAS Portal was updated on October 27, 2026 and Atom Messenger on October 27, 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.*