# AI Grammar Keyboard vs Kujun

The clearest difference is in-app purchases: Kujun at none against AI Grammar Keyboard's 1. Kujun also leads on ads (none vs shown) and iOS requirement (16.4 vs 26.0). AI Grammar Keyboard's advantage is update cadence (every 6 days vs every 3 months). On price and device support there is nothing between them.

Both are free to download. AI Grammar Keyboard sells 1 one-off in-app purchase. Kujun asks for nothing beyond the download.

AI Grammar Keyboard ships an update every 6 days, Kujun every 3 months. The most recent releases landed on October 25, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | AI Grammar Keyboard | Kujun |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 6 days** | Every 3 months |
| Size | 12 MB | 49 MB |
| Requires iOS | 26.0 | **16.4** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Digital Hole Pvt. Ltd.](https://appshunter.io/developer/917701060) | [Code with Beto](https://appshunter.io/developer/1735070532) |

## What reviewers say

### AI Grammar Keyboard

[App page](https://appshunter.io/ios/app/ai-grammar-keyboard-typebuddy/id6759708423)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Lifetime | $4.99 | one-time |


### Kujun

[App page](https://appshunter.io/ios/app/kujun/id6790163790)

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

**In-app purchases:** none


## Frequently asked questions

### Is AI Grammar Keyboard free?

AI Grammar Keyboard is free to download, with in-app purchases available.

### Is Kujun free?

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

### Do AI Grammar Keyboard or Kujun have ads?

AI Grammar Keyboard shows ads; Kujun does not.

### Which is updated more often, AI Grammar Keyboard or Kujun?

AI Grammar Keyboard ships an update every 6 days, and Kujun every 3 months. Most recently, AI Grammar Keyboard was updated on October 25, 2026 and Kujun on October 15, 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.*