Comparison

PDF Reader vs Sign PDF

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

PDF Reader

Easily view, edit, search, and annotate PDF documents. This software helps manage your daily work needs by supporting multiple document formats and offering convenient sharing and printing options.

Highlights
  • View PDF documents
  • Text search within PDFs
  • Annotate documents
  • Document management
  • Support multiple formats
  • Share and print PDFs
Features
Read full description

PDF Reader is an easy-to-use software that can quickly view, edit, search, annotate, share or print PDF content ,including forms and multimedia to meet your daily work needs. 【Main functions】 • View • Text search • Annotations • Document Management • Support multiple document formats • Share • Print 【Starter guide】 1. Open the PDF document 1) Open from other applications Find the PDF document on emails, webs or other application, tap the Share icon or Open-in option, and choose Copy to PDF Reader, select "PDF Reader". The document will be opened in the PDF Reader . 2) Within the APP You can open the PDF documents that you viewed or edited recently within the APP . 2. Process the documents Open the PDF documents and choose the tools at the top right to process. 3. Complete processing Share files to your friends with email, Facebook, Twitter, Airdrop. Or, print it. 【PDF Reader VIP member subscription instructions】 We offer subscription plans as followed, the price will change depending on the currency 1-month subscription 1-year subscription Payment will be charged to iTunes Account at confirmation of purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current period. Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. Subscriptions may be managed by the user and auto renewal may be turned off by going to the user's Account Settings after purchase. No cancellation of the current subscription is allowed during active subscription period. Any unused portion of a free trial period will be forfeited when the user purchases a subscription to that publication, where applicable. Terms of service: https://kkyun.com/html/service.html Privacy policy: https://kkyun.com/html/privacy.html 【Feedback】 Please contact us: service@kkyun.com

About

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.

Highlights
  • Apply signature to PDF
  • Export as PDF
  • PDF to JPEG conversion
  • Print from device
  • Share via email
  • Multiple signature creation modes
Features
Read full description

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

PDF Reader4 screens
Sign PDF4 screens

Verdict

The call

The clearest difference is review sentiment: PDF Reader at 47% against Sign PDF's 7%. PDF Reader also leads on update cadence (monthly vs every 69 months) and iOS requirement (9.0 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. PDF Reader sells 2 in-app purchases, starting at $1.99 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.

UpkeepUpdate frequency

PDF Reader ships an update monthly, Sign PDF every 69 months. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
PDF Reader versus Sign PDF: the parameters behind the verdict, then further details
ParameterPDF ReaderSign PDF
PriceFreeFree
Rating4.0 (93 ratings) — better—
Positive reviews46.7% of reviews — better7.1% of reviews
Number of ratings93 — better—
Update frequencyMonthly — betterEvery 69 months
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS9.0 — better17.0
Further details — not scored
Size52 MB3 MB
Age rating4+4+
DeveloperABV MobileMatteo Morelli

Customer experience

PDF Reader

All ratings91 ratings
Positive70.3%
Neutral6.6%
Negative23.1%
Written reviews15 reviews
Positive46.7%
Neutral13.3%
Negative40.0%

Sign PDF

Written reviews14 reviews
Positive7.1%
Neutral0.0%
Negative92.9%

In-app purchases

2 purchases

PDF Reader

Subscriptions2
  • Monthly VIP$1.991 Month
  • Annual VIP3 Days trial$14.491 Year
3 purchases

Sign PDF

Subscriptions2
  • Firma Pro Weekly3 Days trial$3.997 Days
  • Firma Pro Yearly$22.991 Year
One-time1
  • Firma Pro Lifetime$49.99

Questions

Is PDF Reader free?
PDF Reader is free to download, with in-app purchases available.
Is Sign PDF free?
Sign PDF is free to download, with in-app purchases available.
Do PDF Reader or Sign PDF have ads?
Neither PDF Reader nor Sign PDF shows ads.
Which is updated more often, PDF Reader or Sign PDF?
PDF Reader ships an update monthly, and Sign PDF every 69 months. Most recently, PDF Reader was updated on October 22, 2026 and Sign PDF on October 24, 2026.

Other comparisons