# PDF OCR vs Zhizhi

The clearest difference is rating: Zhizhi at 5.0 against PDF OCR's 4.4. Zhizhi also leads on in-app purchases (none vs 3) and device support (4 vs 2). PDF OCR's advantage is ratings volume (7 vs 2). On price and ads there is nothing between them.

Both are free to download. PDF OCR sells 3 in-app purchases, starting at $3.99 per month. Zhizhi asks for nothing beyond the download.

Zhizhi holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 7 and 2 respectively.

## The numbers

| Metric | PDF OCR | Zhizhi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (7 ratings)](https://appshunter.io/ios/app/pdf-ocr-scanner-and-editor/id6738633268/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/zhizhi/id6740143014/reviews)** |
| Number of ratings | **7** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | — |
| Monetization | Freemium | **Free** |
| Size | 9 MB | 38 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 17+ | 4+ |
| Developer | [Layerz Corp.](https://appshunter.io/developer/1617729865) | [CoreSpeed Inc.](https://appshunter.io/developer/1717281942) |

## What reviewers say

### PDF OCR

[App page](https://appshunter.io/ios/app/pdf-ocr-scanner-and-editor/id6738633268)

This app transforms your iPhone or iPad into a powerful PDF tool. Scan documents, recognize and edit text, convert files, and sign PDFs all on your device. It offers advanced features for annotation, measurement, and protection.

**Highlights:** Document scanning and text recognition (OCR), Edit text and images directly on the page, Convert between PDF, Word, and Office formats, Annotate with pens, highlighters, and shapes, Fill and sign PDF forms, Measure drawings to scale, Password protection and redaction

**Features:** macOS Compatibility, Family Sharing, Vision Pro support, iPhone Duo support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF OCR Pro Monthly | $3.99 | per month |
| PDF OCR Pro Yearly | $19.99 | per year |
| PDF OCR Pro Lifetime | $49.99 | one-time |


### Zhizhi

[App page](https://appshunter.io/ios/app/zhizhi/id6740143014)

This app uses AI to provide instant, one-minute podcast-style explanations of academic terms and content on each page of your documents. It acts like a personal tutor, making complex papers and lectures more accessible.

**Highlights:** AI-powered explanations, One-minute summaries per page, Academic term clarification, Document content analysis, Personalized tutor experience

**In-app purchases:** none


## Frequently asked questions

### Is PDF OCR free?

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

### Is Zhizhi free?

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

### Which has better reviews, PDF OCR or Zhizhi?

Zhizhi is rated higher. PDF OCR averages 4.4 out of 5 from 7 ratings, while Zhizhi averages 5.0 from 2 ratings.

### Do PDF OCR or Zhizhi have ads?

Neither PDF OCR nor Zhizhi shows ads.

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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.*