PDF Reader vs Sign PDF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PDF Reader
Edit, convert, and manage PDF documents on your mobile device. This app allows you to directly edit text, scan documents, fill out forms, and secure your files with passwords and watermarks. It also supports OCR to extract text from scans and convert PDFs to various formats.
- Edit PDF text directly
- Convert PDF to Word, Excel, PPT, images
- OCR for text extraction from scans
- Fill and sign PDF forms
- Secure PDFs with passwords and watermarks
- Annotate PDFs with highlights and notes
- Merge and split PDF files
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KDAN PDF, formerly KDAN PDF Reader, is a mobile PDF editor and reader for iPhone, iPad, and Mac. Edit text directly on your device. Then scan, organize, convert, sign, and share your PDFs in one simple and powerful app. Trusted by millions, KDAN PDF connects your workflow across iPhone, iPad, and Mac, making it easy to review, annotate, and finalize documents anywhere. Who Recommends Us? - Featured as “10 Essentials” in Utility on iTunes - Featured in “10 Best PDF Reader Apps For iPhone & iPad 2019” by FOSSBYTES - Featured as “Best Utility App” in App Store Rewind KEY FEATURES PDF EDITOR • Edit and correct any typos directly on PDFs • Merge multiple files into one PDF • Split a large PDF into several small PDFs • Rotate, delete, add, and rearrange pages • Extract pages or images from PDFs • Change PDF background color PDF CONVERTER • Online & Offline PDF converter • Convert PDF to Word, Excel, PPT & image conversions (docx, xlsx, pptx, jpg, png, gif & bmp). • Save webpages and images as PDFs OCR (Optical Character Recognition) • Recognize and extract text from scans • Export OCR results as text or searchable PDFs • Support 50+ languages SIGN, FORM FILLING, SHARE • Fill out & edit PDF forms • Sign on PDFs • Customize and manage signatures SHARE FILES • Get files from KDAN Cloud, iCloud Drive, Dropbox, OneDrive, Google Drive, Evernote, FTP, or WebDAV client • Compress PDFs • Share flatten PDFs • Send faxes directly from within the app PDF SECURITY • Add passwords to lock PDFs • Remove passwords & restrictions from PDFs • Add & remove PDF watermarks • Validate certificates & signatures in PDF documents VIEW FILES • Supports all mainstream file formats, including Vitrium* PDF format (Like University of Phoenix Ebooks) • Text Reflow & Auto Flow • Present a PDF as a slideshow • View multiple PDFs as tabs • Dark mode supported (only for iOS13 & macOS Mojave and later) • Convert text to spoken audio (text-to-speech) ANNOTATE & REVIEW PDF • Annotate PDFs with highlights, underlines, strikeout text, shapes, sticky notes & text boxes • Add pre-designed stamps, including Approved, Sign Here, Confidential, and more • Add custom stamps with time and date information • Insert hyperlinks to external websites, target pages, and email address • Attach audio notes & insert images to PDFs • Turn handwriting into text with Scribble (Available for iPad) • Add handwritten notes to PDFs MANAGE ANNOTATIONS • Save annotations in XFDF format • Remove all annotations in one tap - Recommended by Techradar, Techworm & Softsonic UPGRADE OPTIONS DOCUMENT 365 • Try for $0.00 for 7 days • Access KDAN PDF on Mac, iPhone, iPad, and other platforms. • Annual plan: billed at USD 59.99/year after the 7-day free trial ends • Quarterly plan: billed at USD 19.99/quarter after 3-day free trial ends • Monthly plan: billed at USD 9.99/month after 3-day free trial ends Subscriptions will be charged to your Apple account upon purchase and will auto-renew 24 hours before the current period ends at the same price and duration. Cancellation during the active period is not allowed. Manage your trial and subscription in your Apple account. Terms of service: https://pdf-reader.kdandoc.com/terms-of-service Privacy Policy: https://pdf-reader.kdandoc.com/privacy-policy Got a question? Contact us at helpdesk@kdanmobile.com or check out https://support.kdanmobile.com
Sign PDF
Easily add your signature to PDF documents using your device. Create signatures by taking a photo, using special fonts, drawing on screen, or importing an image. Export signed documents as PDFs or JPEGs, and print or share them directly.
- Apply signature to PDF
- Export as PDF
- PDF to JPEG conversion
- Print from device
- Share via email
- Multiple signature creation modes
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Sign a PDF and send it back in under a minute — without leaving your iPhone. Sign PDF is the fast, private way to sign documents, fill forms and get paperwork done. Import a PDF, tap where to sign, and share the finished file. No account, no uploads, no waiting. WHY YOU'LL LOVE IT • Sign any PDF or document in seconds • Everything happens on your device — nothing is ever uploaded • Works completely offline • No sign-up, no subscription required to get started • Exports a clean, flattened PDF — never watermarked SIGN YOUR WAY • Draw your signature with a finger or Apple Pencil • Snap a photo of your signature on paper — the background is removed automatically • Type your name in a handwritten-style font • Save multiple signatures and initials, then reuse them with one tap FILL & COMPLETE • Add free-form text boxes anywhere, with size and color control • Quick Fields: save your name, company, email and address once, insert them instantly • Date tool with auto-today and your preferred format • Add checkmarks and X-marks to tick boxes • Fill interactive form fields (AcroForm) IMPORT FROM ANYWHERE • Open PDFs straight from Mail, Files or iCloud Drive • Scan paper documents with your camera • Turn photos into a PDF EXPORT & SHARE • Flatten and share via the standard share sheet • Print, or save back to Files • The original document is never changed until you export FREE VS PRO Free: sign documents every month, one saved signature, text and date tools included, full-quality export. Pro unlocks: unlimited documents, the document scanner, photo and typed signature capture, multiple signatures and initials, Quick Fields and interactive form filling. PRIVACY FIRST Your documents are yours. Sign PDF has no backend and no account system. Files stay in the app, protected on your device, and are never sent to a server. Sign contracts, agreements and sensitive paperwork with total peace of mind — even in airplane mode. Download Sign PDF and turn your iPhone into a pocket signing tool. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://keysersoft.com/signpdf/privacy-policy
Screenshots
Verdict
The clearest difference is review sentiment: PDF Reader at 81% against Sign PDF's 7%. PDF Reader also leads on update cadence (every 2 months vs every 69 months) and iOS requirement (13.0 vs 17.0). Sign PDF's advantage is monetization model (free vs freemium). 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. PDF Reader sells 10 in-app purchases, starting at $2.99 per month and Sign PDF sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.
PDF Reader ships an update every 2 months, Sign PDF every 69 months. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.
| Parameter | PDF Reader | Sign PDF |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (3.8K ratings) — better | — |
| Positive reviews | 80.8% of reviews — better | 7.1% of reviews |
| Number of ratings | 3.8K — better | — |
| Update frequency | Every 2 months — better | Every 69 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 190 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Kdan Mobile Software LTD | Matteo Morelli |
Customer experience
PDF Reader
Sign PDF
Bugs and requests
PDF Reader
Reported bugs
3 issues- Unable to open or access saved files
- Syncing and backup issues
- Compatibility problems with newer iOS versions
Requested features
4 requests- Improved file management and organization
- Better integration with cloud storage services
- More customization options
- Enhanced accessibility features
Sign PDF
Not enough reviews yet to summarise bugs or requests.
In-app purchases
PDF Reader
- KDAN Cloud$2.991 Month
- Deluxe Business Pack$5.991 Month
- Creativity 3653 Days trial$9.991 Month
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- Document 365 (Month)3 Days trial$9.991 Month
- Deluxe PDF Pack for iPhone$12.993 Months
- Creativity 365 - 3 Months3 Days trial$19.993 Months
- Document 365 (Quarter)3 Days trial$19.993 Months
- Deluxe PDF Pack for iPhone$39.991 Year
- Document 3657 Days trial$59.991 Year
- Upgrade to Premium$2.99
Sign PDF
- Firma Pro Weekly3 Days trial$3.997 Days
- Firma Pro Yearly$22.991 Year
- Firma Pro Lifetime$49.99
Questions
Is PDF Reader free?
Is Sign PDF free?
Do PDF Reader or Sign PDF have ads?
Which is updated more often, PDF Reader or Sign PDF?
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