# AI Grammar Assistant vs Omni Study

The clearest difference is ads: AI Grammar Assistant at none against Omni Study's shown. Omni Study's advantage is update cadence (monthly vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. AI Grammar Assistant sells 7 in-app purchases, starting at $2.99 per 7 days and Omni Study sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

AI Grammar Assistant ships an update every 2 months, Omni Study monthly. The most recent releases landed on October 11, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | AI Grammar Assistant | Omni Study |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Freemium | — |
| Size | 3 MB | 69 MB |
| Requires iOS | 16.6 | 16.6 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Leimomi Lane](https://appshunter.io/developer/1736577207) | [Duy Khiem Dng](https://appshunter.io/developer/1896462033) |

## What reviewers say

### AI Grammar Assistant

[App page](https://appshunter.io/ios/app/ai-grammar-assistant/id6479434692)

Enhance your writing with AI-powered proofreading. Get instant corrections for grammar, spelling, and punctuation, along with style and tone suggestions. Learn from your mistakes with personalized tips to improve your communication skills.

**Highlights:** Comprehensive grammar, punctuation, and spelling checks, Style and tone suggestions, Personalized learning tips, Instant feedback, Seamless integration with various platforms

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AI Assistant Premium | $2.99 | per 7 days |
| Basic Monthly Subscription | $10.00 | per month |
| Pro Monthly Subscription | $20.00 | per month |
| Premium Monthly Subscription | $30.00 | per month |
| Basic Yearly Subscription | $100.00 | per year |
| Pro Yearly Subscription | $200.00 | per year |
| Premium Yearly Subscription | $300.00 | per year |


### Omni Study

[App page](https://appshunter.io/ios/app/omni-study-schedule-and-notes/id6767295511)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Omni Study Pro | $1.99 | per month |
| Omni Study Pro | $19.99 | per year |
| Omni Study Lifetime Pro | $79.99 | one-time |


## Frequently asked questions

### Is AI Grammar Assistant free?

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

### Is Omni Study free?

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

### Do AI Grammar Assistant or Omni Study have ads?

Omni Study shows ads; AI Grammar Assistant does not.

### Which is updated more often, AI Grammar Assistant or Omni Study?

AI Grammar Assistant ships an update every 2 months, and Omni Study monthly. Most recently, AI Grammar Assistant was updated on October 11, 2026 and Omni Study on October 24, 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.*