# NORMATTER vs Keiros

The clearest difference is update cadence: NORMATTER at every 3 days against Keiros's fortnightly. Keiros's advantage is iOS requirement (13.0 vs 18.0). 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.

NORMATTER ships an update every 3 days, Keiros fortnightly. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | NORMATTER | Keiros |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Fortnightly |
| Size | 32 MB | 91 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 9+ | 17+ |
| Developer | [MORIYO TAMURA](https://appshunter.io/developer/1828388351) | [HOICKO TECHNOLOGIES PRIVATE LIMITED](https://appshunter.io/developer/1611139767) |

## What reviewers say

### NORMATTER

[App page](https://appshunter.io/ios/app/normatter/id6755220940)

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

**In-app purchases:** none


### Keiros

[App page](https://appshunter.io/ios/app/keiros/id6759155891)

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

**In-app purchases:** none


## Frequently asked questions

### Is NORMATTER free?

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

### Is Keiros free?

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

### Do NORMATTER or Keiros have ads?

Neither NORMATTER nor Keiros shows ads.

### Which is updated more often, NORMATTER or Keiros?

NORMATTER ships an update every 3 days, and Keiros fortnightly. Most recently, NORMATTER was updated on October 28, 2026 and Keiros on October 31, 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.*