# Ontrasys Lite vs Open BRAIN（オープンブレイン）

The clearest difference is update cadence: Open BRAIN（オープンブレイン） at every 11 days against Ontrasys Lite's every 4 months. Ontrasys Lite's advantage is iOS requirement (13.6 vs 15.1). 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.

Ontrasys Lite ships an update every 4 months, Open BRAIN（オープンブレイン） every 11 days. The most recent releases landed on October 6, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Ontrasys Lite | Open BRAIN（オープンブレイン） |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 11 days** |
| Size | 13 MB | 46 MB |
| Requires iOS | **13.6** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TOPPAN PRINTING CO.,LTD.](https://appshunter.io/developer/373909233) | [OPEN8 Inc.](https://appshunter.io/developer/990515324) |

## What reviewers say

### Ontrasys Lite

[App page](https://appshunter.io/ios/app/ontrasys-lite/id1297899857)

**Features:** macOS Compatibility

**In-app purchases:** none


### Open BRAIN（オープンブレイン）

[App page](https://appshunter.io/ios/app/open-brain/id6695736371)

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

**In-app purchases:** none


## Frequently asked questions

### Is Ontrasys Lite free?

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

### Is Open BRAIN（オープンブレイン） free?

Open BRAIN（オープンブレイン） is free to download, with no in-app purchases.

### Do Ontrasys Lite or Open BRAIN（オープンブレイン） have ads?

Neither Ontrasys Lite nor Open BRAIN（オープンブレイン） shows ads.

### Which is updated more often, Ontrasys Lite or Open BRAIN（オープンブレイン）?

Ontrasys Lite ships an update every 4 months, and Open BRAIN（オープンブレイン） every 11 days. Most recently, Ontrasys Lite was updated on October 6, 2026 and Open BRAIN（オープンブレイン） on September 30, 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.*