PDF OCR vs Zhizhi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PDF OCR
This app offers a comprehensive suite of tools for managing PDF files. It allows you to extract text using OCR, convert PDFs to images, secure documents with passwords, and merge or split files. It also enables creating PDFs from images and converting webpages into PDF format, all while ensuring your data remains private through offline processing.
- Extract text with OCR
- Convert PDF to images
- Secure PDFs with passwords
- Merge or split PDFs
- Create PDFs from images
- Convert webpages to PDF
- Compress file size
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PDF OCR turns your iPhone and iPad into a complete PDF workspace: scan paper into searchable PDFs, read and mark up any PDF, and fix files with a full set of tools. Everything runs on your device. SCAN TO PDF • Point the camera at a page; edges are found and the page is straightened for you • Scan many pages in one go, then reorder, rotate or remove them • Text is recognized automatically, so scans are searchable and selectable • Reads QR codes and puts both sides of an ID card on one page READ AND MARK UP • Pen, highlighter, text highlight, underline and strikethrough • Notes, shapes, arrows, stamps and your saved signature • Select anything you added to move or resize it • Reorder, rotate, insert and delete pages • Search, contents and bookmarks, night mode and read aloud ALL YOUR PDF TOOLS • Recognize text (OCR) in scanned PDFs • Make files smaller • Merge PDFs and images, split by pages, ranges or every N pages • Convert PDF to images, text and RTF, and web pages to PDF • Add or remove passwords and permissions PRIVATE BY DESIGN Your documents never leave your device. Scanning, text recognition and summaries run on the device, with no account. PDF OCR PRO Pro adds OCR without page limits, advanced split, redaction that removes content for good, watermarks and page numbers, Face ID lock, smart file names for scans, on-device summaries and translation, and Shortcuts actions. Choose monthly, yearly (with a 7-day free trial) or a one-time lifetime purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period, and can be managed in Settings › Apple Account › Subscriptions. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://layerz.app/pdfocr/privacy
Zhizhi
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.
- AI-powered explanations
- One-minute summaries per page
- Academic term clarification
- Document content analysis
- Personalized tutor experience
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Open a lecture slide or an academic paper, and with each new page, you’re left puzzled—so many unfamiliar academic terms make it difficult to follow. At times like this, having a personal tutor to explain each page to you in just one minute would make the document much easier to understand. Zhizhi provides AI experts across various industries, ready in the top-right corner of every new page in your document to generate AI-powered podcast explanations of the content on that page!
Screenshots
Verdict
The clearest difference is rating: Zhizhi at 5.0 against PDF OCR's 4.4. Zhizhi also leads on device support (4 vs 2) and iOS requirement (12.0 vs 17.0). PDF OCR's advantage is ratings volume (7 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
| Parameter | PDF OCR | Zhizhi |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (7 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 7 — better | 2 |
| Update frequency | Every 3 weeks | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 17.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 38 MB |
| Age rating | 17+ | 4+ |
| Developer | Layerz Corp. | CoreSpeed Inc. |
Customer experience
PDF OCR
Zhizhi
In-app purchases
PDF OCR
No in-app purchases
Zhizhi
No in-app purchases









