# ChatNPU vs Grammar Fix

The clearest difference is in-app purchases: ChatNPU at none against Grammar Fix's 3. ChatNPU also leads on update cadence (every 8 days vs every 3 months) and iOS requirement (16.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Grammar Fix sells 3 in-app purchases, starting at $4.99 per month. ChatNPU asks for nothing beyond the download.

ChatNPU ships an update every 8 days, Grammar Fix every 3 months. The most recent releases landed on October 3, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | ChatNPU | Grammar Fix |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 3 months |
| Size | 3 MB | 2 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [RBN SPC LTD](https://appshunter.io/developer/1865350457) | [APPCITY Limited Liability Company](https://appshunter.io/developer/1534242389) |

## What reviewers say

### ChatNPU

[App page](https://appshunter.io/ios/app/chatnpu/id6761174172)

**In-app purchases:** none


### Grammar Fix

[App page](https://appshunter.io/ios/app/grammar-fix/id6780668610)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GrammarFix Premium Monthly | $4.99 | per month |
| GrammarFix Premium Yearly | $29.99 | per year |
| GrammarFix Premium Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is ChatNPU free?

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

### Is Grammar Fix free?

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

### Do ChatNPU or Grammar Fix have ads?

Neither ChatNPU nor Grammar Fix shows ads.

### Which is updated more often, ChatNPU or Grammar Fix?

ChatNPU ships an update every 8 days, and Grammar Fix every 3 months. Most recently, ChatNPU was updated on October 3, 2026 and Grammar Fix on October 5, 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.*