# Contextual Kaiwa vs Onsei

The clearest difference is in-app purchases: Onsei at none against Contextual Kaiwa's 4. Contextual Kaiwa's advantage is update cadence (daily vs every 10 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Contextual Kaiwa sells 4 one-off in-app purchases. Onsei asks for nothing beyond the download.

Contextual Kaiwa ships an update daily, Onsei every 10 days. Both last shipped on November 9, 2026.

## The numbers

| Metric | Contextual Kaiwa | Onsei |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Every 10 days |
| Size | 191 MB | 33 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [HAIPING OU](https://appshunter.io/developer/1886304740) | [鑫 陈](https://appshunter.io/developer/1709457072) |

## What reviewers say

### Contextual Kaiwa

[App page](https://appshunter.io/ios/app/contextual-kaiwa/id6760800115)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Season 1 (JLPT N5) | $3.99 | one-time |
| Season 2 (JLPT N4) | $4.99 | one-time |
| Season 3 (JLPT N3) | $6.99 | one-time |
| All Seasons (N5-N3) | $12.99 | one-time |


### Onsei

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

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

**In-app purchases:** none


## Frequently asked questions

### Is Contextual Kaiwa free?

Contextual Kaiwa is free to download, with in-app purchases available.

### Is Onsei free?

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

### Do Contextual Kaiwa or Onsei have ads?

Neither Contextual Kaiwa nor Onsei shows ads.

### Which is updated more often, Contextual Kaiwa or Onsei?

Contextual Kaiwa ships an update daily, and Onsei every 10 days. Most recently, Contextual Kaiwa was updated on November 9, 2026 and Onsei on November 9, 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.*