# KAISAI X vs FDM AR

The clearest difference is iOS requirement: FDM AR at 13.0 against KAISAI X's 16.4. On price, update cadence, 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.

KAISAI X ships an update every 6 months, FDM AR every 4 months. The most recent releases landed on October 8, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | KAISAI X | FDM AR |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 4 months** |
| Size | 90 MB | 163 MB |
| Requires iOS | 16.4 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TECH Sterowniki](https://appshunter.io/developer/1155426726) | [XRS Group Sp. z o.o.](https://appshunter.io/developer/1682426414) |

## What reviewers say

### KAISAI X

[App page](https://appshunter.io/ios/app/kaisai-x/id6503295010)

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

**In-app purchases:** none


### FDM AR

[App page](https://appshunter.io/ios/app/fdm-ar/id6738663236)

**In-app purchases:** none


## Frequently asked questions

### Is KAISAI X free?

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

### Is FDM AR free?

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

### Do KAISAI X or FDM AR have ads?

Neither KAISAI X nor FDM AR shows ads.

### Which is updated more often, KAISAI X or FDM AR?

KAISAI X ships an update every 6 months, and FDM AR every 4 months. Most recently, KAISAI X was updated on October 8, 2026 and FDM AR on October 6, 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.*