# Caty App vs Grammar Fix

The clearest difference is device support: Caty App at 4 against Grammar Fix's 1. Caty App also leads on iOS requirement (15.5 vs 18.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Caty App sells 1 one-off in-app purchase and Grammar Fix sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Caty App | Grammar Fix |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 71 MB | 3 MB |
| Requires iOS | **15.5** | 18.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [OU Catyonic](https://appshunter.io/developer/1863920797) | [APPCITY Limited Liability Company](https://appshunter.io/developer/1534242389) |

## What reviewers say

### Caty App

[App page](https://appshunter.io/ios/app/caty-app/id6759576079)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 100 AI Messages | $0.99 | one-time |


### 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 Caty App free?

Caty App is free to download, with in-app purchases available.

### Is Grammar Fix free?

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

### Do Caty App or Grammar Fix have ads?

Neither Caty App nor Grammar Fix shows ads.

### Which is updated more often, Caty App or Grammar Fix?

Caty App ships an update every 2 months, and Grammar Fix every 2 months. Most recently, Caty App was updated on October 25, 2026 and Grammar Fix on October 31, 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.*