# NSOperation vs Grammar Checker

The clearest difference is in-app purchases: NSOperation at none against Grammar Checker's 3. NSOperation also leads on ads (none vs shown). Grammar Checker's advantage is device support (4 vs 1) and iOS requirement (12.0 vs 18.2). On price there is nothing between them.

Both are free to download. Grammar Checker sells 3 in-app purchases, starting at $3.99 per 7 days. NSOperation asks for nothing beyond the download.

## The numbers

| Metric | NSOperation | Grammar Checker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (5 ratings)](https://appshunter.io/ios/app/grammar-checker-ai-corrector/id6748822107/reviews)** |
| Number of ratings | — | **5** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Daily |
| Monetization | — | Free with in-app purchases |
| Size | 2 MB | 97 MB |
| Requires iOS | 18.2 | **12.0** |
| Devices | iPhone | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Romero](https://appshunter.io/developer/893059976) | [淑环 关](https://appshunter.io/developer/1657322159) |

## What reviewers say

### NSOperation

[App page](https://appshunter.io/ios/app/nsoperation/id6746875864)

**Features:** macOS Compatibility

**In-app purchases:** none


### Grammar Checker

[App page](https://appshunter.io/ios/app/grammar-checker-ai-corrector/id6748822107)

Enhance your English writing with AI-powered grammar checking, sentence analysis, and advanced expression suggestions. Understand mistakes with clear explanations and track your progress with writing history. Includes AI writing and chat assistants for comprehensive support.

**Highlights:** Smart grammar checking with error highlighting, Sentence-by-sentence analysis and AI explanations, Advanced expression and writing suggestions, AI writing and chat assistants, Writing history tracking, Text-to-speech for pronunciation practice

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Grammar Checker Weekly VIP | $3.99 | per 7 days |
| Grammar Checker Monthly VIP | $9.99 | per month |
| Grammar Checker Yearly VIP | $49.99 | per year |


## Frequently asked questions

### Is NSOperation free?

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

### Is Grammar Checker free?

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

### Do NSOperation or Grammar Checker have ads?

Grammar Checker shows ads; NSOperation does not.

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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.*