PDF Studio vs fork ai
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PDF Studio
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Merge, split, compress and edit PDFs without uploading a single file. Everything runs on your iPhone — no account, no sign-up, nothing leaves your device. One app instead of ten: MERGE PDF Combine multiple PDF files into a single document. Drag to set the order, merge in one tap. SPLIT PDF Split a PDF into separate files, or extract an exact page range from a large document. COMPRESS PDF Get under the email attachment limit without turning your document into mush. ROTATE & REARRANGE PAGES Fix sideways scans, reorder pages, delete the ones you do not need. WATERMARK PDF Stamp DRAFT or CONFIDENTIAL across any page. PROTECT PDF Lock a file with a password and keep private documents encrypted. EXTRACT TEXT & OCR Pull real, selectable text out of a scan, a photo, or a PDF. SCAN TO PDF Point your camera at any document. Auto edge detection crops and straightens each page. Receipts, contracts, ID cards, notes. IMAGE TO PDF Convert JPG, PNG or any photo to PDF. Pick your images, reorder, export one file. PDF TO IMAGE Export any PDF page as a high quality JPG. SIGN PDF Draw your signature once, then place it on any contract or form. READ & SEARCH A fast PDF viewer with in-document search, so you can find any word in a long file. FILES Everything you have made in one place. Search, rename, share, organise. PRIVACY There is no server. Your documents are processed on your device and stay there. No account required, and it all works in airplane mode. PDF STUDIO PREMIUM Premium removes all ads and unlocks unlimited use, as a monthly or yearly auto-renewing subscription. Payment is charged to your Apple ID at confirmation of purchase. The subscription renews automatically unless it is turned off at least 24 hours before the end of the current period, and your account is charged for renewal within 24 hours of the end of that period. You can manage or cancel your subscription in your App Store account settings after purchase. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://iamadeeb.github.io/pdfstudio-legal/?lang=en&doc=privacy
fork ai
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Upload your lecture PDF and fork ai turns it into a mind map of notes. Then dig into any part of it: open a branch on the map, or tap a sentence and Ask AI about exactly that. Every question becomes a branch on your map, so you can find your place again. HOW IT WORKS • Upload a lecture PDF (lecture slides saved as PDF are fine), a text file, a Markdown file or an image • fork ai builds a mind map of notes from it • Open any branch from the map to read it • Tap a sentence, or highlight a passage, and tap Ask AI to ask about exactly that • Each answer becomes a new branch on the map • Mix several branches into one new answer with the Mixer KEEP AND SHARE YOUR WORK • Highlight in colors and pin callouts • Export a session to Notion as a structured page • Share a session with a link. Anyone can read it without an account • Choose the AI model for each branch • Turn on web search to get answers with cited sources • Get a notification when a long research run finishes BEFORE YOU UPLOAD • fork ai reads up to 50 pages, or about 40,000 characters, of a file • Scanned PDFs with no text layer are read by OCR: the first 10 pages only, and English only • If a file was only partly read, the app tells you, so you can split it and upload the rest • You need an account to upload. Sign-up is free CREDIT New accounts get a one-time $5 starting credit. AI answers use up credit. When it runs out, you can buy more inside the app.
Screenshots
Verdict
The clearest difference is ads: fork ai at none against PDF Studio's shown. PDF Studio's advantage is update cadence (every 2 weeks vs every 2 months). On price, in-app purchases, device support and iOS requirement 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. PDF Studio sells 2 in-app purchases, starting at $2.99 per month and fork ai sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
PDF Studio ships an update every 2 weeks, fork ai every 2 months. The most recent releases landed on October 12, 2026 and October 9, 2026 respectively.
| Parameter | PDF Studio | fork ai |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks — better | Every 2 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.5 | 15.0 — better |
| Further details — not scored | ||
| Size | 94 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Edip Yılmaz | Gokul Madathupalyam Chinnappan |
In-app purchases
PDF Studio
- Monthly Pro$2.991 Month
- Yearly Pro$19.991 Year
fork ai
- $5 Credit$6.99
- $10 Credit$13.99









