# OMR vs PDF Grader PRO

The clearest difference is price: OMR at Free against PDF Grader PRO's $4.99. OMR also leads on ads (none vs shown). PDF Grader PRO's advantage is in-app purchases (none vs 1) and update cadence (every 3 days vs every 5 weeks). On device support and iOS requirement there is nothing between them.

OMR is free to download; PDF Grader PRO costs $4.99 up front. OMR sells 1 one-off in-app purchase. PDF Grader PRO asks for nothing beyond the download.

OMR ships an update every 5 weeks, PDF Grader PRO every 3 days. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | OMR | PDF Grader PRO |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Every 3 days** |
| Size | 2 MB | 12 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [YungUi Lee](https://appshunter.io/developer/1712131697) | [Hyeonchan Yu](https://appshunter.io/developer/1857516231) |

## What reviewers say

### OMR

[App page](https://appshunter.io/ios/app/omr/id6749879119)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OCR Premium | $1.99 | one-time |


### PDF Grader PRO

[App page](https://appshunter.io/ios/app/pdf-grader-pro/id6755943630)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OMR free?

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

### Is PDF Grader PRO free?

PDF Grader PRO costs $4.99, with no in-app purchases.

### Do OMR or PDF Grader PRO have ads?

PDF Grader PRO shows ads; OMR does not.

### Which is updated more often, OMR or PDF Grader PRO?

OMR ships an update every 5 weeks, and PDF Grader PRO every 3 days. Most recently, OMR was updated on October 12, 2026 and PDF Grader PRO on October 7, 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.*