# PlayKatsuyo vs OpenKoto

The clearest difference is iOS requirement: PlayKatsuyo at 15.0 against OpenKoto's 18.0. 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.

PlayKatsuyo ships an update every 9 days, OpenKoto weekly. Both last shipped on October 31, 2026.

## The numbers

| Metric | PlayKatsuyo | OpenKoto |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/openkoto/id6793335573/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 days | **Weekly** |
| Monetization | — | Free |
| Size | 46 MB | 9 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 12+ | 4+ |
| Developer | [Gianluca Pane](https://appshunter.io/developer/1871920832) | [倍铭 刘](https://appshunter.io/developer/1831757727) |

## What reviewers say

### PlayKatsuyo

[App page](https://appshunter.io/ios/app/playkatsuyo/id6791490125)

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

**In-app purchases:** none


### OpenKoto

[App page](https://appshunter.io/ios/app/openkoto/id6793335573)

Learn languages using your favorite content like articles, books, and videos. Understand sentences in context, collect vocabulary, and review it on a schedule. This privacy-first app offers on-device subtitle generation and reading aids.

**Highlights:** Import text, books, and web content, On-device subtitle generation for videos, Contextual sentence understanding, Spaced-repetition vocabulary review, Search imported content, Progress statistics

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PlayKatsuyo free?

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

### Is OpenKoto free?

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

### Do PlayKatsuyo or OpenKoto have ads?

Neither PlayKatsuyo nor OpenKoto shows ads.

### Which is updated more often, PlayKatsuyo or OpenKoto?

PlayKatsuyo ships an update every 9 days, and OpenKoto weekly. Most recently, PlayKatsuyo was updated on October 31, 2026 and OpenKoto 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.*