Comparison

Document Signer vs PDF AI

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

Head to head
About

Document Signer

Easily sign PDFs, fill forms, and manage scanned documents. This app offers a free e-signature feature and a camera scanner. Upgrade to Pro for advanced editing tools, templates, and cloud syncing.

Highlights
  • Electronic document signing
  • PDF and image file signing
  • Camera scanner for documents
  • Document editing tools
  • Ready-to-use templates
  • Google Drive syncing
  • Local storage for privacy
Features
Read full description

Introducing SimpleSign, your ultimate assistant for electronically signing and managing documents with ease. Whether you need to sign a PDF, fill out forms, or organize scanned documents, SimpleSign offers a comprehensive solution designed to streamline your workflow. Effortless Document Signing and Editing SimpleSign simplifies the process of signing documents electronically. With a user-friendly interface and intuitive design, you can sign PDFs and image files seamlessly. Utilize the free e-signature feature to sign documents quickly and securely. For full access to premium tools, templates, and advanced editing features, an upgrade to SimpleSign Pro is available. Versatile Editing Tools Enhance your documents with multiple editing tools available in SimpleSign. Customize texts, import images, add checkboxes, and insert initials wherever necessary. Some advanced editing features require a Pro subscription. Comprehensive Document Management Manage your documents effectively with SimpleSign’s integrated features. Use the free camera scanner to capture physical documents and convert them into digital files. Organize your documents within the app, making it easy to access and retrieve important information. Pro users can unlock additional tools for improved workflow efficiency. Ready-to-Use Templates Save time with SimpleSign’s extensive library of templates. Choose from over 15+ pre-designed templates for contracts, forms, and more. Some templates are available for free, while premium templates require a Pro subscription. Secure and Private Rest assured that your documents are secure with SimpleSign’s local storage feature. No account is required to start signing. Your documents remain on your device for maximum privacy. Integration and Google Drive Syncing With its brand new feature, SimpleSign can now backup all your scanned and signed documents with the connection of your Google account. It seamlessly integrates with your workflow giving you the ability to never loose your documents and easily recover them to a new phone! Upgrade to SimpleSign Pro Unlock premium features with a SimpleSign Pro subscription, including: - Access to all templates - Advanced editing tools - Unlimited document storage - Priority support - More customization options SimpleSign Pro offers a 3-day free trial for new users, followed by a paid subscription. Privacy Policy: https://sites.google.com/view/simplesign/privacy-policy Terms of Use: https://sites.google.com/view/simplesign/terms-conditions Support: zionstudiosapps@gmail.com All rights reserved, Zion Studios LLC, 2024

About

PDF AI

This application offers a comprehensive suite of AI-powered tools for managing PDF documents. Users can edit text and images, generate AI summaries, convert files to various formats, and securely sign documents. It prioritizes speed and privacy with local processing and encryption.

Highlights
  • Edit PDF text and images
  • AI-powered summaries and highlights
  • Annotate and collaborate on documents
  • Fill and e-sign forms
  • Convert PDFs to Word, Excel, PPT, Images, TXT
  • Secure offline scanning and organization
Features
Read full description

AI-powered PDF toolkit built for speed, security, and clarity. Chat with PDFs, summarize long documents, generate slides, create podcast-style audio, scan, edit, convert, sign, and collaborate—without friction. What you can do • Chat with PDFs: Ask questions and get instant answers from documents. • Summarize smarter: Turn long PDFs, reports, papers, and books into clear key points. • Generate with AI: Create slides, podcast-style audio, visual digests, and insight cards from documents. • Edit PDFs: Modify text, images, and layout with precision. • Read smarter: AI summaries, highlights, bookmarks, day/night/Sepia. • Annotate & collaborate: Highlight, underline, notes, sketches, comments, and share. • Fill & sign: Complete interactive forms and e‑sign on the go. • Convert fast: PDF ⇄ Word/Excel/PPT/Images/TXT with high fidelity. • Scan & organize: Scan documents, extract text with OCR, search, manage, and work offline securely. Why it’s better • AI tools for reading, understanding, presenting, and listening to documents. • Lightning-fast viewer for large PDFs. • Privacy-first: local processing and strong encryption. • Professional output, zero watermarks for subscribers. • Continuous updates with new AI capabilities. VIP (auto‑renewable subscriptions) • Monthly or yearly plans available. • Unlock premium tools: advanced editing, full‑text search, batch processing, high‑quality exports, AI summaries, AI chat, AI slides, podcast-style audio, visual digests, OCR, conversion tools, and more. Policies • Privacy: https://sophoninc.com/privacy.html • Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ • Terms of Service: https://sophoninc.com/terms.html Contact • Email: feedback@sophoninc.com

Screenshots

Document Signer4 screens
PDF AI4 screens

Verdict

The call

The clearest difference is ads: Document Signer at none against PDF AI's shown. Document Signer also leads on update cadence (every 9 days vs every 3 weeks). PDF AI's advantage is review sentiment (90% vs 75%) and ratings volume (151 vs 26). On price, rating, 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. Document Signer sells 4 in-app purchases, starting at $4.99 per 7 days and PDF AI sells 5 in-app purchases, starting at $7.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Document Signer against 4.8 for PDF AI. That said, the two scores are not equally well evidenced: PDF AI has 151 ratings behind it against 26, so its average is the more settled of the two. Written reviews are what separate them: 75% of Document Signer's written reviews are positive against 90% of PDF AI's.

UpkeepUpdate frequency

Document Signer ships an update every 9 days, PDF AI every 3 weeks. The most recent releases landed on August 14, 2026 and September 20, 2026 respectively.

Scorecard4 real differences · 6 level
Document Signer versus PDF AI: the parameters behind the verdict, then further details
ParameterDocument SignerPDF AI
PriceFreeFree
Rating4.7 (26 ratings)4.8 (151 ratings) — better
Positive reviews75.0% of reviews90.0% of reviews — better
Number of ratings26151 — better
Update frequencyEvery 9 days — betterEvery 3 weeks
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.115.0 — better
Further details — not scored
Size47 MB169 MB
Age rating4+4+
DeveloperZion Studios LLCYang Yang

Customer experience

Document Signer

All ratings26 ratings
Positive92.3%
Neutral3.8%
Negative3.8%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

PDF AI

All ratings151 ratings
Positive95.4%
Neutral1.3%
Negative3.3%
Written reviews40 reviews
Positive90.0%
Neutral2.5%
Negative7.5%

In-app purchases

4 purchases

Document Signer

Subscriptions3
  • Pro Weekly Subscription3 Days trial$4.997 Days
  • Pro Monthly Subscription3 Days trial$12.991 Month
  • Pro Yearly Subscription3 Days trial$59.991 Year
One-time1
  • Lifetime SimpleSign Offer$69.99
5 purchases

PDF AI

Subscriptions5
  • Weekly VIP$7.997 Days
  • Weekly VIP$9.997 Days
  • Weekly VIP3 Days trial$9.997 Days
Show 2 more
  • Monthly VIP3 Days trial$14.991 Month
  • Yearly VIP3 Days trial$59.991 Year

Questions

Is Document Signer free?
Document Signer is free to download, with in-app purchases available.
Is PDF AI free?
PDF AI is free to download, with in-app purchases available.
Which has better reviews, Document Signer or PDF AI?
PDF AI is rated higher. Document Signer averages 4.7 out of 5 from 26 ratings, while PDF AI averages 4.8 from 151 ratings.
Do Document Signer or PDF AI have ads?
PDF AI shows ads; Document Signer does not.
Which is updated more often, Document Signer or PDF AI?
Document Signer ships an update every 9 days, and PDF AI every 3 weeks. Most recently, Document Signer was updated on August 14, 2026 and PDF AI on September 20, 2026.

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