UPDF vs KayaPDF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
UPDF
This app is a powerful PDF editor for mobile devices, offering AI-powered features for summarizing, translating, and chatting with documents. It allows users to read, edit, annotate, convert, and sign PDFs, as well as scan paper documents into editable files. Manage all your PDF files and protect them with security features.
- AI-powered summarization and translation
- Edit text, images, and watermarks in PDFs
- Annotate with various markup tools
- Convert PDFs to Word, Excel, and PPT
- Scan documents to editable PDFs
- Sign and fill PDF forms
- Organize and protect PDF files
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UPDF for iOS is an AI-powered PDF editor for iPhone and iPad. Read, edit, annotate, convert, sign, and AI chat with your PDFs — all from your iOS device. Summarize lengthy documents, translate full PDFs, scan paper to PDF, and manage all your files in one place. Amazing features of UPDF for iOS: Edit PDF - Edit text in PDF (change color, font style, font size) - Edit images in PDF (rotate, extract, replace, and crop images) - Edit watermark in PDF (add, edit, delete and favor watermark) - Edit links in PDF (add, edit, copy, and delete) AI Assistant - Summarize, translate, explain, and rephrase lengthy PDFs in minutes. - Engage in a chat with UPDF AI and ask it any questions you have. - Summarize or translate PDF by pages. - Export conversations to Markdown or TXT files. - NEW AI Bookmark Agent: Auto-generate bookmarks and get instant section summaries for any PDF. - NEW AI Semantic Search: Search your PDF by meaning, not just exact words. - NEW AI Editing Suite: Rewrite, refine tone, or correct grammar directly. Read PDF - Flexible reading: vertical and horizontal scrolling, single page or two-page view - Dark mode to protect your eyes - Add and manage bookmarks with AI Bookmark Agent's help - Search text in PDF - Present PDF as a slideshow - Text-to-speech support Annotate PDF - Annotate PDFs using markup tools: pencil, highlight, underline, strikethrough, squiggly line - Add text boxes, text comments, callouts, sticky notes - Add shapes, stamps, and stickers to PDFs - Free-hand drawing on PDF pages OCR PDF - Convert scanned documents and images into searchable and editable PDFs - Recognize text in 38 languages Scan to PDF - Scan physical documents to PDF with your camera - Scan ID cards onto one page - Crop, rotate, and filter scanned images Convert PDF - Convert PDF to Word, Excel, PPT, and images Organize PDF Pages - Insert, replace, extract, split, rotate, remove, and reorder pages in PDFs - Merge multiple PDFs into one file - Copy, paste, and share specific pages in a PDF Sign PDF & Fill PDF Form - Create handwritten signatures - Import and add image signatures - Fill PDF form and add e-signatures - Save signatures to cloud for cross-platform use Create PDF - Create PDF with blank, lined, dotted, grid, and graph papers - Combine multiple files/images into one PDF Protect PDF - Password-protect PDFs to restrict opening, editing, and printing - Add or remove watermarks - Add digital signatures Manage Files - Upload, create, rename, move, copy, duplicate, and organize files or folders - Unzip files by simply tapping .zip files - Search for files - Supports two-finger multiple selections and operations - Move files or folders to trash, and find deleted items in the trash - Protect PDF files with a password or unlock protected PDF files - Compress one or multiple files into a zip file Security Space - Protect your privacy by moving files or folders to Security Space - Enable Face ID & Passcode to access your Security Space Import File - Import files from Photos albums - Import files from the Files App - Transfer files from a computer over the same Wi-Fi View files in All Formats - Browse dozens of different file formats including PDFs, Office documents (.doc, .docx, .ppt, .pptx, .xls, .xlsx), Pages, Keynotes, and Numbers with a single app - Open other formats such as text, HTML, XML, Web Archive, Images (JPG, JPEG, GIF, PNG, TIFF, SVG, BMP), video, audio *** Pro Features of In-App Purchase *** - Use UPDF across all platforms including desktops and mobiles - Free Users will get 1 GB of Cloud Storage; Paid users will get 10 GB of Cloud Storage for free - Advanced PDF features such as Convert PDF with OCR, batch process, etc. are available on the desktop - Unlimited use of Scan to PDF (Free trial only scans up to 5 pages) - Unlimited use of Security Space (Trial version stores up to 10 items) - Secure App with passcode/TouchID/FaceID Need help? Email us at support@superace.com
KayaPDF
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Bring your reading, notes and everyday PDF tasks together with KayaPDF. Review study material, mark up a report or prepare selected pages to share—all from your phone or tablet, with no account required. Create PDFs from paper documents and photos. Scan with your camera, review the captured pages, or select photos and arrange them in the order you want. Save the result to your library, then annotate, sign or share it. You can also export the current PDF page or selected pages as JPG or PNG images. Scanner availability depends on your device. Read at your own pace with continuous scrolling and zoom. Search document text, jump to a page or use an available table of contents. Select and copy passages across pages, then highlight the parts you want to return to. Make each document useful to you. Add highlights and notes, draw by hand and undo or redo changes as you work. Supported styluses adjust stroke width with pressure. Fill supported form fields and place a handwritten signature on the page. Put pages in the right order, combine pages from different PDFs or extract the pages you need into a new file. Share the current page, selected pages or the whole document with your saved annotations. Work on private copies and choose when to save or share your results. Turn scanned pages into useful text with on-device OCR. Review recognized text, search it, copy it or export a text file. Create a searchable PDF copy to find words in your scans while keeping the source unchanged. Keep your documents together in the library. Create a library backup, restore it when needed and recover files from Recently Deleted. The app interface is available in 20 languages. Form, OCR and export support varies by document, language and device; protected or digitally signed PDFs and XFA forms have limitations. PDF content is processed on your device. App usage analytics is optional; advertising and text recognition services may process technical data as explained in the privacy policy. KayaPDF has no purchases or subscriptions. Banner ads appear only in the library; the reader and PDF tools have no banners. Support: https://kayapdf.com/contact/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://kayapdf.com/privacy/
Screenshots
Verdict
The clearest difference is in-app purchases: KayaPDF at none against UPDF's 10. UPDF's advantage is ads (none vs shown) and iOS requirement (14.0 vs 17.0). On price and device support 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. UPDF sells 10 in-app purchases, starting at $9.99 per month. KayaPDF asks for nothing beyond the download.
| Parameter | UPDF | KayaPDF |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (705 ratings) — better | — |
| Positive reviews | 84.3% of reviews | — |
| Number of ratings | 705 — better | — |
| Update frequency | Fortnightly | — |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 195 MB | 17 MB |
| Age rating | 4+ | 12+ |
| Developer | Superace Software Technology Co., Ltd. | Cryptosam LLC |
Bugs and requests
UPDF
Reported bugs
3 issues- Inability to edit text directly in PDF files
- Inconsistent behavior when switching between devices
- Occasional loss of editing progress when app is minimized
Requested features
5 requests- Add password protection for PDF files
- Improve file organization and folder management
- Implement keyboard shortcuts for power users
- Expand OCR capabilities and text extraction
- Allow custom signature and stamp imports
KayaPDF
Not enough reviews yet to summarise bugs or requests.
In-app purchases
UPDF
- Monthly Subscription$9.991 Month
- UPDF AI Unlimited$15.001 Month
- UPDF AI Standard$15.001 Month
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- UPDF Pro + AI Unlimited$18.991 Month
- Quarterly Subscription$19.003 Months
- Annual Subscription$49.991 Year
- UPDF AI Standard$69.001 Year
- UPDF AI Unlimited$79.001 Year
- Perpetual License$79.99
- UPDF & AI Add-on for iOS$148.99
KayaPDF
No in-app purchases









