# Proofreader AI Grammar Checker vs Control Stack

The clearest difference is in-app purchases: Control Stack at none against Proofreader AI Grammar Checker's 11. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Proofreader AI Grammar Checker sells 8 in-app purchases, starting at $4.99 per month. Control Stack asks for nothing beyond the download.

Proofreader AI Grammar Checker ships an update fortnightly, Control Stack every 3 weeks. The most recent releases landed on October 13, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Proofreader AI Grammar Checker | Control Stack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3.3K ratings)](https://appshunter.io/ios/app/proofreader-ai-grammar-checker/id1494119626/reviews)** | — |
| Number of ratings | **3.3K** | — |
| Positive reviews | 64.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Freemium | — |
| Size | 59 MB | 22 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [BlueSoar SL](https://appshunter.io/developer/1493410779) | [Mindset Cyber](https://appshunter.io/developer/1894765574) |

## What reviewers say

### Proofreader AI Grammar Checker

[App page](https://appshunter.io/ios/app/proofreader-ai-grammar-checker/id1494119626)

Enhance your writing with an AI-powered keyboard and assistant. Correct grammar, spelling, and punctuation, and improve clarity and style. Generate text, rewrite sentences, and expand your vocabulary anywhere you type.

**Highlights:** AI Keyboard with one-tap proofreading, Advanced grammar, spelling, and punctuation checker, AI rewriting and paraphrasing, Text generation and vocabulary enhancement, Style and clarity improvements, Translator and dictionary

**Features:** Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Proofreader Pro | $4.99 | per month |
| Proofreader Pro | $9.99 | per month |
| Monthly Plan | $9.99 | per month |
| Proofreader Pro | $13.49 | per 3 months |
| Proofreader Pro | $24.99 | per 3 months |
| Proofreader Pro | $39.99 | per year |
| Proofreader Pro | $47.99 | per year |
| Proofreader Pro | $49.99 | per year |

**What reviewers like**

- 🚀 Helpful grammar and writing suggestions
- 👍 Easy to use
- 💡 Affordable alternative to Grammarly
- 👍 Explains why changes are suggested
- 💡 Useful for non-native English speakers

**What reviewers complain about**

- 🐛 Inconsistent performance, sometimes misses errors
- 🔍 Limited functionality in free version
- 🔍 Subscription required for full features
- 🐛 Issues with pasting text into other apps
- 🐛 Struggles with specialized/foreign names

**Reported bugs**

- Difficulty cancelling subscriptions
- Unexpected charges during free trials
- App crashes or freezes
- Incorrect grammar/spelling corrections

**Requested features**

- Keyboard integration for easier use
- More customization options
- Improved accuracy and consistency
- Desktop/browser extension version
- Better handling of creative/informal writing styles


### Control Stack

[App page](https://appshunter.io/ios/app/control-stack-essential-8-plus-iso/id6762587850)

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

**In-app purchases:** none


## Frequently asked questions

### Is Proofreader AI Grammar Checker free?

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

### Is Control Stack free?

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

### Do Proofreader AI Grammar Checker or Control Stack have ads?

Neither Proofreader AI Grammar Checker nor Control Stack shows ads.

### Which is updated more often, Proofreader AI Grammar Checker or Control Stack?

Proofreader AI Grammar Checker ships an update fortnightly, and Control Stack every 3 weeks. Most recently, Proofreader AI Grammar Checker was updated on October 13, 2026 and Control Stack on October 11, 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.*