# Neko Dictionary vs Onsei

The clearest difference is iOS requirement: Onsei at 15.1 against Neko Dictionary'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.

Neko Dictionary ships an update fortnightly, Onsei every 10 days. The most recent releases landed on September 9, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | Neko Dictionary | Onsei |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 10 days** |
| Size | 91 MB | 33 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Shanghai Yidudu Technology Co., Ltd.](https://appshunter.io/developer/1862062047) | [鑫 陈](https://appshunter.io/developer/1709457072) |

## What reviewers say

### Neko Dictionary

[App page](https://appshunter.io/ios/app/neko-dictionary/id6756643217)

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

**In-app purchases:** none


### Onsei

[App page](https://appshunter.io/ios/app/onsei/id6761715885)

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

**In-app purchases:** none


## Frequently asked questions

### Is Neko Dictionary free?

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

### Is Onsei free?

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

### Do Neko Dictionary or Onsei have ads?

Neither Neko Dictionary nor Onsei shows ads.

### Which is updated more often, Neko Dictionary or Onsei?

Neko Dictionary ships an update fortnightly, and Onsei every 10 days. Most recently, Neko Dictionary was updated on September 9, 2026 and Onsei on September 4, 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.*