Comparison

Acrobat Reader vs Sign.Plus

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

Head to head
About

Acrobat Reader

This app is a powerful PDF tool for viewing, editing, annotating, and signing documents. It offers AI-powered features for summarizing and interacting with PDFs, along with robust conversion and security options. Collaborate on files and access your documents from anywhere.

Highlights
  • View, edit, and annotate PDFs
  • Sign and fill PDF forms
  • Convert files to and from PDF
  • AI-powered document summarization
  • Collaborate in PDF Spaces
  • Compress and secure PDFs
  • Optical Character Recognition (OCR)
Features
Read full description

Major new updates: Collaborate and share your files in PDF Spaces, and turn your document summaries into podcast-style audio in Acrobat Studio. The world’s most trusted PDF reader, PDF editor, and PDF maker with more than 635 million installs. View, share, annotate, add comments, and sign documents - all in one app. You can store your files online and read documents anywhere. Get your 7-day free trial and try all the features of Acrobat Reader. Paid features: Adobe Acrobat AI Assistant • Work across multiple files in one place with PDF Spaces. Collaborate, store, and use AI Assistant across files • Use voice or text prompts with AI Assistant chatbot • Ask questions and get cited answers about details in your document, including charts, graphs, and tables with Figures Q&A • Easily share the responses you get • Try voice support to ask queries and have answers read aloud. • Use new Hands-free to keep the conversation flowing with voice only • Instantly generate summaries from your PDFs with Generative AI Summaries • Get content for emails, text, study notes, blogs, and more [Adobe Acrobat AI Assistant is a paid feature*, free for a limited time] Edit PDFs • With our PDF editor, edit text and images directly in your PDF (mobile only) • Fix typos or add paragraphs with the PDF editor • Easily add, delete, or rotate any image • Use this PDF signer and PDF viewer to get your docs just right Recognize text • Optical Character Recognition (OCR) turns scanned PDFs into searchable, editable text to use in other formats Merge & organize PDFs with PDF Converter • Split or combine multiple files into one PDF with PDF converter • Use the PDF editor to insert, delete, rotate, crop & reorder pages in your PDF file Create, convert & export PDFs • Easily convert to PDF from any file type including Microsoft, Google Docs, and images • Export and convert PDFs to Microsoft Word, Excel, PowerPoint, or various image files • Convert web pages to PDFs Compress & highly secure PDFs • Compress PDF files for easy saving and sharing • Password Protect PDF documents Have your PDF read aloud • Listen to your PDFs on the go, great for reading support • Choose free voices or upgrade for high-quality options Subscribe now to access all these features and use Acrobat across mobile and web platforms. Free-to-use features: PDF signer: Fill & Sign Adobe Fill & Sign is free & available in Acrobat Reader. A form filler and PDF signer that lets you fill, sign, and send Liquid mode in the optimal PDF viewer • Get the best PDF reading experience with this PDF viewer • Search, navigate & adjust font size or spacing to fit your screen Annotate PDFs • Add sticky notes, comments, and highlight text Store & manage files • Link online storage accounts like Microsoft OneDrive, Dropbox, or Google Drive • Star files to quickly open important documents Connect the PDF viewer and reader to Google Drive • A PDF creator that lets you edit, compress, and export Google Drive files with a subscription Work with scanned documents • Access scanned PDFs from Adobe Scan in Acrobat to fill, sign, and share The Acrobat Reader mobile app is designed to work with customers who have Enterprise Mobility Management (EMM) enabled. *An Adobe Acrobat AI Assistant add-on plan is available to Acrobat Individual customers. iOS 16 or above required. Terms & Conditions: Your use of this application is governed by the Adobe General Terms of Use http://www.adobe.com/go/terms_linkfree_en and the Adobe Privacy Policy http://www.adobe.com/go/privacy_policy_linkfree_en Do not sell or share my personal information www.adobe.com/go/ca-rights-linkfree

About

Sign.Plus

This app provides a secure and legally-binding electronic signature solution for signing documents on mobile devices. It allows users to fill and sign PDFs, scan paper documents, and send documents to others for signature with tamper-proof audit trails.

Highlights
  • Fill and sign documents
  • Send documents for signature
  • Tamper-proof audit trails
  • Legally-binding electronic signatures
  • Paper scanning to digital
  • Data encryption
Features
Read full description

Sign.Plus is a legally-binding electronic signature solution to sign documents on iPhone and iPad devices and send documents for signature. It’s secure, reliable, cross-platform, and super easy to use. Using this free eSignature app, you can fill and sign PDF documents, Word documents, and other types of supported documents. You can also utilize the paper scanning feature to convert your paper documents to digital documents and sign them electronically. √ Sign.Plus recognized as the best e-Signature solution to fill and sign documents! ◆ Fill and sign documents: Sign.Plus allows you to create an electronic signature to e-sign documents wherever you are and whenever you want. You can draw a signature, type your signature or use your initials. ◆ Send documents for signature: Other than the option to fill and sign documents yourself, you can also send documents for signature. You can send a request for signature even if the signees do not have a Sign.Plus account. You can add various fields to the documents, including signature, initials, date, text, and checkbox. ◆ Tamper-proof audit trails: For every document that goes into the process of signing electronically, there are real-time logs to keep track of any activity that has occurred with information such as name, IP address, email address, device, and much more. The audit trails are non-editable and each document action is thoroughly tracked and time-stamped, serving as legal proof of receipt, review, and signature. ◆ Legally-binding electronic signature: Sign.Plus complies with electronic signature regulations such as ESIGN, eIDAS, and ZertES to ensure it delivers the same legal standing as pen-and-paper signatures. ► Extensive security measurements and compliance offerings ◆ Data encryption: We encrypt all documents at rest using 256-bit Advanced Encryption Standard (AES), with each user’s unique encryption key. Furthermore, to protect data in transit between our apps (currently mobile, API, web) and our servers, we use TLS 1.2+ encryption. ◆ Various compliance offerings: We are committed to certifying ourselves and our e-signing platform for all relevant certifications and compliances, including SOC 2, HIPAA, ISO 27001, GDPR, CCPA, and more. ► Looking for an easy way to e-sign PDF documents? We’ve got you covered If you are looking for a secure document signing app to fill and sign PDF documents, we are here to help. This free eSignature app offers the easiest online signature experience ever, unlike other form filling and e-sign applications. You can sign PDF docs, contracts, leases, NDAs, agreements, and pretty much every type of legal document without having to go through a complicated process. Download Sign.Plus for free on your iOS device, scan/import the document you wish to sign/be signed electronically and, depending on the nature of the document, e-sign it yourself or send it for signature. Sign.Plus features and advantages: • Legally-binding electronic signature solution • Advanced yet easy-to-use document signing platform • Fill and sign PDF documents • Send documents for signature • Create an electronic signature (Type, draw, or use initials) • Extensive regulatory compliance offerings, including SOC 2, HIPAA, ISO 27001, GDPR, CCPA, and more • Scan documents with your mobile camera (automatic document detection, magnifier, border cropping, perspective correctness) • Data encryption • Tamper-proof audit trails • Save documents as draft • Get real-time notifications • Multiple date formats • Free e signature app to sign documents on iPhone and iPad * Sign.Plus is HIPAA compliant, provided the user has advanced security controls activated and enters into a business associate agreement (BAA) with Sign.Plus. Advanced security controls are available on the Enterprise plan tier. Any further questions or requests? Do not hesitate to reach us on our website, app, or by email at support@sign.plus. Our customer support team will be pleased to help you!

Screenshots

Acrobat Reader4 screens
Sign.Plus4 screens

Verdict

The call

The clearest difference is review sentiment: Sign.Plus at 86% against Acrobat Reader's 49%. Sign.Plus also leads on rating (4.8 vs 4.6) and iOS requirement (15.0 vs 18.3). Acrobat Reader's advantage is ratings volume (654K vs 281) and update cadence (every 9 days vs every 3 weeks). On price, ads, in-app purchases and monetization model 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. Acrobat Reader sells 16 in-app purchases, starting at $3.99 per month and Sign.Plus sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Sign.Plus holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Acrobat Reader has 654K ratings behind it against 281, so its average is the more settled of the two. Written reviews point the same way: 49% of Acrobat Reader's written reviews are positive against 86% of Sign.Plus's.

UpkeepUpdate frequency

Acrobat Reader ships an update every 9 days, Sign.Plus every 3 weeks. The most recent releases landed on September 24, 2026 and September 25, 2026 respectively.

Scorecard6 real differences · 5 level
Acrobat Reader versus Sign.Plus: the parameters behind the verdict, then further details
ParameterAcrobat ReaderSign.Plus
PriceFreeFree
Rating4.6 (654K ratings)4.8 (281 ratings) — better
Positive reviews49.2% of reviews85.7% of reviews — better
Number of ratings654K — better281
Update frequencyEvery 9 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
Best chart rank#2 — better—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.315.0 — better
Further details — not scored
Size522 MB129 MB
Age rating4+4+
DeveloperAdobe Inc.Alohi

Customer experience

Acrobat Reader

All ratings654,141 ratings
Positive91.4%
Neutral2.4%
Negative6.2%
Written reviews3,096 reviews
Positive49.2%
Neutral4.4%
Negative46.4%

Sign.Plus

All ratings281 ratings
Positive95.0%
Neutral1.1%
Negative3.9%
Written reviews49 reviews
Positive85.7%
Neutral0.0%
Negative14.3%

User reviews

Acrobat Reader

From 654K App Store ratings

What we love

  • 🚀 Fast and efficient
  • 🔒 Secure document storage
  • 👍 Convenient for reading and annotating PDFs
  • 👍 Useful for students and professionals

Room to improve

  • 🐛 Buggy and unreliable
  • 🔒 Overly intrusive login requirements
  • 💰 Expensive subscription model
  • 👎 Counterintuitive user interface changes
  • 🔍 Poor search and organization features

Sign.Plus

From 281 App Store ratings

What we love

  • 👍 Easy to use interface
  • 🚀 Efficient document signing
  • 🔒 Secure document handling
  • 💡 Scans everything easily
  • 👍 Convenient for quick signatures

Room to improve

  • 🐛 Horrible app interface
  • 🐛 Difficult to use on phone
  • 🐛 Bait and switch tactics
  • 🐛 Tricky to unsubscribe
  • 🐛 App not working

Bugs and requests

Acrobat Reader

Reported bugs

4 issues
  • Frequent crashes and freezes
  • Inconsistent behavior when editing PDFs
  • Inability to open or save certain file types
  • Sync issues between mobile and desktop versions

Requested features

5 requests
  • Add erase tool for annotations
  • Improve palm rejection for Apple Pencil
  • Allow direct text editing in PDFs
  • Provide better cloud integration and sync
  • Offer more customization options

Sign.Plus

Reported bugs

3 issues
  • App not working
  • Freezes occasionally
  • Support obstructing work

Requested features

2 requests
  • Ability to send documents out
  • Improved phone interface

In-app purchases

16 purchases

Acrobat Reader

Subscriptions16
  • Acrobat Premium - Monthly$3.991 Month
  • Adobe Acrobat Premium$4.991 Month
  • AI Assistant for Acrobat$6.991 Month
Show 13 more
  • Acrobat Premium$7.497 Days
  • Acrobat Premium - Monthly$9.991 Month
  • Acrobat Premium - Weekly$9.997 Days
  • PDF Pack - Doc Creator$9.991 Month
  • Premium - Edit & Create PDF$9.991 Month
  • PDF Edit and Convert Monthly7 Days trial$12.991 Month
  • Acrobat Premium - Monthly$12.991 Month
  • Acrobat Premium - Monthly$14.991 Month
  • Acrobat Reader Plus - Yearly$19.991 Year
  • Adobe ExportPDF$23.991 Year
  • Adobe Acrobat Pro$24.991 Month
  • Acrobat Premium - Yearly7 Days trial$48.991 Year
  • Acrobat Premium - Yearly7 Days trial2 variants$69.991 Year
4 purchases

Sign.Plus

One-time4
  • Personal Plan (One Month)$14.99
  • Premium Plan (One Month)$29.99
  • Personal Plan (One Year)$119.99
Show 1 more
  • Professional Plan (One Year)$239.99

Questions

Is Acrobat Reader free?
Acrobat Reader is free to download, with in-app purchases available.
Is Sign.Plus free?
Sign.Plus is free to download, with in-app purchases available.
Which has better reviews, Acrobat Reader or Sign.Plus?
Sign.Plus is rated higher. Acrobat Reader averages 4.6 out of 5 from 654K ratings, while Sign.Plus averages 4.8 from 281 ratings.
Do Acrobat Reader or Sign.Plus have ads?
Neither Acrobat Reader nor Sign.Plus shows ads.
Which is updated more often, Acrobat Reader or Sign.Plus?
Acrobat Reader ships an update every 9 days, and Sign.Plus every 3 weeks. Most recently, Acrobat Reader was updated on September 24, 2026 and Sign.Plus on September 25, 2026.

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