# Delta单词 vs Onsei

The clearest difference is update cadence: Delta单词 at daily against Onsei's every 10 days. 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.

Delta单词 ships an update daily, Onsei every 10 days. The most recent releases landed on September 8, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | Delta单词 | Onsei |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Daily** | Every 10 days |
| Size | 180 MB | 33 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [田丰 何](https://appshunter.io/developer/1674464316) | [鑫 陈](https://appshunter.io/developer/1709457072) |

## What reviewers say

### Delta单词

[App page](https://appshunter.io/ios/app/delta/id6744654342)

**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 Delta单词 free?

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

### Is Onsei free?

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

### Do Delta单词 or Onsei have ads?

Neither Delta单词 nor Onsei shows ads.

### Which is updated more often, Delta单词 or Onsei?

Delta单词 ships an update daily, and Onsei every 10 days. Most recently, Delta单词 was updated on September 8, 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.*