# kotonavi vs 流域 / Ryuiki

The clearest difference is update cadence: 流域 / Ryuiki at every 2 days against kotonavi's every 2 months. kotonavi's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 17.0). On price, 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.

kotonavi ships an update every 2 months, 流域 / Ryuiki every 2 days. The most recent releases landed on October 3, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | kotonavi | 流域 / Ryuiki |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Size | 12 MB | 10 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [KOTOBANO MICHIANNAI, N.P.O.](https://appshunter.io/developer/1272710425) | [KENTA TORIMOTO](https://appshunter.io/developer/1880253937) |

## What reviewers say

### kotonavi

[App page](https://appshunter.io/ios/app/kotonavi/id1272710426)

**Features:** macOS Compatibility

**In-app purchases:** none


### 流域 / Ryuiki

[App page](https://appshunter.io/ios/app/ryuiki/id6759816013)

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

**In-app purchases:** none


## Frequently asked questions

### Is kotonavi free?

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

### Is 流域 / Ryuiki free?

流域 / Ryuiki is free to download, with no in-app purchases.

### Do kotonavi or 流域 / Ryuiki have ads?

Neither kotonavi nor 流域 / Ryuiki shows ads.

### Which is updated more often, kotonavi or 流域 / Ryuiki?

kotonavi ships an update every 2 months, and 流域 / Ryuiki every 2 days. Most recently, kotonavi was updated on October 3, 2026 and 流域 / Ryuiki on October 20, 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.*