# Ontrasys Pro vs ウォッチロガー

The clearest difference is device support: Ontrasys Pro at 3 against ウォッチロガー's 1. Ontrasys Pro also leads on iOS requirement (13.6 vs 16.6). 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.

Ontrasys Pro ships an update every 3 months, ウォッチロガー every 2 months. The most recent releases landed on September 16, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Ontrasys Pro | ウォッチロガー |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Size | 17 MB | 7 MB |
| Requires iOS | **13.6** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [TOPPAN PRINTING CO.,LTD.](https://appshunter.io/developer/373909233) | [FUJITA ELECTRIC WORKS, LTD.](https://appshunter.io/developer/1615518386) |

## What reviewers say

### Ontrasys Pro

[App page](https://appshunter.io/ios/app/ontrasys-pro/id1486536359)

**Features:** macOS Compatibility

**In-app purchases:** none


### ウォッチロガー

[App page](https://appshunter.io/ios/app/id6463776017)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ontrasys Pro free?

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

### Is ウォッチロガー free?

ウォッチロガー is free to download, with no in-app purchases.

### Do Ontrasys Pro or ウォッチロガー have ads?

Neither Ontrasys Pro nor ウォッチロガー shows ads.

### Which is updated more often, Ontrasys Pro or ウォッチロガー?

Ontrasys Pro ships an update every 3 months, and ウォッチロガー every 2 months. Most recently, Ontrasys Pro was updated on September 16, 2026 and ウォッチロガー on September 18, 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.*