# Proofreader AI Grammar Checker vs Synchrono

The clearest difference is update cadence: Synchrono at every 2 days against Proofreader AI Grammar Checker's every 3 weeks. On price, ads, in-app purchases 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 and Synchrono sells 1 in-app purchase, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

Proofreader AI Grammar Checker ships an update every 3 weeks, Synchrono every 2 days. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Proofreader AI Grammar Checker | Synchrono |
| --- | --- | --- |
| 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 | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Freemium | — |
| Size | 60 MB | 7 MB |
| Requires iOS | **16.6** | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [BlueSoar SL](https://appshunter.io/developer/1493410779) | [Ibrahim musa](https://appshunter.io/developer/1862727914) |

## What reviewers say

### Proofreader AI Grammar Checker

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

Enhance your writing with a comprehensive grammar checker and AI assistant. Improve clarity, rewrite sentences, detect AI-generated text, and access a translator and dictionary. Works seamlessly across all your typing applications.

**Highlights:** Grammar, spelling, and punctuation correction, Sentence rewriting and tone adjustment, AI-generated text detection, Clipboard for saving and reusing text, Translator for over 100 languages, Writing insights and style suggestions

**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


### Synchrono

[App page](https://appshunter.io/ios/app/synchrono/id6756777137)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Synchrono Basic | $14.99 | per month |


## Frequently asked questions

### Is Proofreader AI Grammar Checker free?

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

### Is Synchrono free?

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

### Do Proofreader AI Grammar Checker or Synchrono have ads?

Neither Proofreader AI Grammar Checker nor Synchrono shows ads.

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

Proofreader AI Grammar Checker ships an update every 3 weeks, and Synchrono every 2 days. Most recently, Proofreader AI Grammar Checker was updated on October 30, 2026 and Synchrono on October 28, 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.*