UPDF vs Common Space
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
Common Space
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Common Space is a privacy-first vault for your most personal photos and videos. Everything you add is encrypted on your device with a key only you know — nothing else, nowhere else. YOUR PHOTOS, SEALED WITH YOUR PIN Common Space encrypts every image and video with AES-256-GCM, the same standard used to protect classified data. The encryption key is derived from your PIN and stored in Apple's Keychain — never on our servers, because we don't operate any. PRIVACY IS THE PRODUCT, NOT THE PITCH • No analytics, no telemetry, no third-party SDKs • No sign-up, no email required • We cannot see your content — not a single byte • Nothing syncs unless you turn iCloud on yourself WORKS OFFLINE Import photos from Photos or Files, capture directly into the vault with the built-in camera, and browse exactly like Apple's Photos app. Optional iCloud sync lets you unlock the same vault on your iPhone and iPad — using your Apple ID and your PIN, never a password we could reset. DISGUISE IT IN PLAIN SIGHT Choose from 12 alternate app icons — a shopping bag, a game die, a mushroom, a rainbow — so a glance at your home screen reveals nothing about what's inside. FREE FOREVER, UPGRADE IF YOU WANT Common Space holds up to 10 items for free, permanently. If you want more, a one-time $9.99 purchase (Common Space Unlimited) removes the cap — no subscription, ever. Supports Apple Family Sharing. TRUST BY DESIGN • AES-256-GCM encryption via Apple's CryptoKit • PIN-derived key wrapped in the iOS Keychain • Face ID / Touch ID as an optional shortcut — PIN still required as backup • Automatic lock when the app goes to the background • Encrypted iCloud sync to your own private CloudKit database • Zero-knowledge: forget your PIN and even we cannot recover your vault Built by DejaWorks LTD, an independent studio focused on tools that respect their users. Get back a corner of the internet that only you can enter.
Screenshots
Verdict
The clearest difference is iOS requirement: UPDF at 14.0 against Common Space's 26.5. On price, ads, in-app purchases 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 13 in-app purchases, starting at $9.99 per month and Common Space sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
| Parameter | UPDF | Common Space |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (699 ratings) — better | — |
| Positive reviews | 84.3% of reviews | — |
| Number of ratings | 699 — better | — |
| Update frequency | Fortnightly | — |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 26.5 |
| Further details — not scored | ||
| Size | 195 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Superace Software Technology Co., Ltd. | DejaWorks LTD |
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
Common Space
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
- UPDF Pro + AI Standard$98.991 Year
- UPDF Pro + AI Unlimited$118.991 Year
- Perpetual License$79.99
- Perpetual License$128.99
- UPDF & AI Add-on for iOS$148.99
Common Space
- Common Space Unlimited$9.99









