Comparison

PDF Editor vs iSign

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

Head to head
About

PDF Editor

Edit text, images, and layout in PDF files without altering formatting. Convert PDFs to various formats, merge documents, and secure them with passwords. Offers cloud integration and user-friendly navigation for efficient document management.

Highlights
  • Edit text and images
  • Convert to multiple formats (Word, PPT, JPG, PNG)
  • Resize PDFs
  • Merge PDF files
  • Secure with password encryption
  • Add watermarks, headers, footers
  • Cloud integration
Features
Read full description

Edit a PDF and get back the file you expected. Many PDF editors move your fonts, your spacing and your layout. PDF Editor is built to keep them where they are. Open a PDF, change the text, the images and the pages, export it, and the document still looks like the original. If a file ever does not come out right, message us from inside the app: we reply within one business day and fix import, editing and font problems as a priority, keeping you posted until it is done. Built in Australia. Your documents stay yours. What you can do • Edit PDF text: change words, font, size and color directly on the page. • Edit PDF images: replace, crop, resize or delete any image. • Sign PDF: draw or type your signature once and place it on any document. • Fill PDF forms: complete a form, save it and send it. • Merge PDF: combine several PDF files into one. • Split PDF: separate one PDF into smaller files. • Compress PDF: reduce the file size for email and upload. • Convert PDF to JPG or PNG: turn any page into an image. • Turn images into a PDF: combine photos or scans into one document. • Open Word, PowerPoint and Illustrator files: edit them as a PDF and export. • Organize pages: reorder, rotate, duplicate, delete, crop and number pages. • Annotate PDF: highlight and underline what matters. • Redact PDF: black out text that must not be shared. • Scan to text (OCR): turn a scanned page into text you can edit. • Unlock PDF: remove a password you own. • Watermark PDF: add a watermark, a header or a footer. • Resize PDF: change the page format without losing quality. Read and annotate any PDF Open any PDF file, read it and highlight what matters. Large files stay sharp when you zoom. Edit PDF text properly Tap a paragraph and type. PDF Editor keeps the font, the line breaks and the spacing you already have, so you do not have to rebuild the page after every change. Sign and fill without printing Draw or type a signature, place it, save it. Fill in a contract, an invoice or an application form and send it back the same day. No printer needed. Merge, split and compress Combine a set of files into one report. Pull three pages out of a long contract. Compress a large PDF so it fits an email limit. All from your phone. Convert and export Save as PDF for print or for web. Export a page as JPG or PNG for a message or a slide. Turn a set of photos into one PDF. Open a Word, PowerPoint or Illustrator file and work on it as a PDF. Start from a template Do not start from an empty page. Open a ready-made invoice, report, proposal, contract, letter, resume, flyer or business card, then change the parts you need. Every template is editable and exports as a PDF. Phone, tablet and web Your documents sync, so you can start on a phone and finish on a laptop. What is free and what is paid Every month a free account includes 5 PDF edits and 20 PDF tool operations such as merge, split, compress or rotate. Subscriptions raise these allowances and more: monthly AI credits and extra storage are included. Common questions Can I change text in a file someone else made? Yes. Open it and tap the text. Can I put two files together? Yes, use Merge. Can I make a file smaller? Yes, use Compress. Can I turn a scan into text? Yes, use Scan to text. Do I need an account? Merge, split, compress, rotate and the other page tools work without one. Editing text, signing, filling forms and watermarks need a free account. Does it work offline? Merge, split, compress, sign, fill forms and the other page tools run on your device and work offline. Editing PDF text in the full editor, scan to text and the AI tools need an internet connection. Something did not import or export correctly. What now? Send it to us from Settings → Feedback & Support. We reply within one business day. Download PDF Editor and fix the PDF properly, the first time. Privacy Policy: https://desygner.com/privacy Terms of Use (EULA): https://desygner.com/terms

About

iSign

Transform any document into a searchable, signable PDF. Scan, organize, and edit with AI-powered summaries and OCR. Your data remains private on your device.

Highlights
  • Scan documents to PDF
  • Automatic edge detection
  • Edit and sign documents
  • OCR text recognition
  • AI-powered summaries
  • On-device data storage
Features
Read full description

Turn any document into a searchable, signable PDF — in seconds. Sherlock is the fastest way to scan, organize, sign, and understand your documents. Whether it's a contract, a receipt, or a handwritten note — just point your camera and you're done. SCAN TO PDF INSTANTLY Use your camera to capture any document with automatic edge detection and perspective correction. Sherlock produces crisp, high-quality PDFs every time — no flatbed scanner needed. EDIT & SIGN DOCUMENTS Add your signature, insert text, draw annotations, and reorder pages directly inside the app. Send signed contracts in minutes, not days. OCR TEXT RECOGNITION Sherlock reads your scanned documents and extracts all the text, making it searchable and copyable. Find any word inside any document, instantly. AI-POWERED SUMMARIES Paste any document or text and get a clear, concise summary in seconds. Ask follow-up questions to refine and dig deeper, like having a personal assistant for your paperwork. YOUR DATA STAYS PRIVATE Documents are stored exclusively on your device. Nothing is uploaded to the cloud without your consent. Your files are yours always. PERFECT FOR: - Freelancers & remote workers signing contracts on the go - Students digitizing class notes and textbooks - Anyone who wants to go paperless at home - Professionals managing receipts, invoices, and legal documents Try free for 3 days. No commitment. Start your trial and see why Sherlock is the last document app you'll ever need. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

PDF Editor4 screens
iSign4 screens

Verdict

The call

The clearest difference is review sentiment: iSign at 100% against PDF Editor's 22%. iSign also leads on rating (5.0 vs 4.6). PDF Editor's advantage is ratings volume (331 vs 1) and update cadence (every 3 days vs fortnightly). 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. PDF Editor sells 14 in-app purchases, starting at $2.99 per 7 days and iSign sells 4 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

iSign holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: PDF Editor has 331 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 22% of PDF Editor's written reviews are positive against 100% of iSign's.

UpkeepUpdate frequency

PDF Editor ships an update every 3 days, iSign fortnightly. The most recent releases landed on October 12, 2026 and September 29, 2026 respectively.

Scorecard5 real differences · 5 level
PDF Editor versus iSign: the parameters behind the verdict, then further details
ParameterPDF EditoriSign
PriceFreeFree
Rating4.6 (331 ratings)5.0 (1 ratings) — better
Positive reviews22.3% of reviews100.0% of reviews — better
Number of ratings331 — better1
Update frequencyEvery 3 days — betterFortnightly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better18.0
Further details — not scored
Size228 MB69 MB
Age rating4+4+
DeveloperDesygner Pty LtdBruno Wide

Customer experience

PDF Editor

All ratings331 ratings
Positive91.5%
Neutral0.3%
Negative8.2%
Written reviews139 reviews
Positive22.3%
Neutral2.9%
Negative74.8%

iSign

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

PDF Editor

Reported bugs

14 issues
  • App crashes when importing PDFs
  • Exported PDFs render at extremely small, unreadable sizes
  • Text editing causes font changes and formatting loss
  • Duplicate function creates multiple unwanted copies or deletes originals
  • App won't open or gets stuck on logo screen
Show 9 more
  • Email verification not sending or sending to wrong address
  • Zoom functionality resets when attempting edits
  • Saved documents disappear from app after restart
  • File upload fails or gets stuck indefinitely
  • Black and white checkered screen replacing PDF content
  • Large chunks of text deleted when leaving text editor open
  • Pages display as blank after export
  • Subscription information not displaying correctly
  • App crashes when clicking add/import button

Requested features

8 requests
  • Better zoom functionality without distorting document sections
  • Ability to edit files across multiple devices with same account
  • Improved text editing capabilities
  • Document rotation (not just flip) functionality
  • Better font compatibility and handling
Show 3 more
  • Offline editing capability
  • Improved file saving and persistence
  • Cross-device synchronization

iSign

Not enough reviews yet to summarise bugs or requests.

In-app purchases

14 purchases

PDF Editor

Subscriptions10
  • Weekly$2.997 Days
  • Starter — Weekly7 Days trial$3.957 Days
  • Pro+ Weekly Subscription 2$4.997 Days
Show 7 more
  • Pro+ Weekly Subscription7 Days trial$6.997 Days
  • Pro+ Monthly Subscription$9.951 Month
  • Monthly3 Days trial$9.991 Month
  • Pro+ Monthly$9.991 Month
  • Pro+ Annual Subscription 2$83.991 Year
  • Annual3 Days trial$89.991 Year
  • Pro+ Annual Subscription$99.991 Year
One-time4
  • Credit pack: 5 credits$4.99
  • Credit pack: 10 credits$7.99
  • Special credit pack$7.99
Show 1 more
  • Credit pack: 30 credits$19.99
4 purchases

iSign

Subscriptions4
  • Scanner Pro - Monthly Promo$0.991 Month
  • Scanner Pro - Monthly$1.991 Month
  • Scanner Pro - Yearly Promo$9.991 Year
Show 1 more
  • Scanner Pro - Yearly$19.991 Year

Questions

Is PDF Editor free?
PDF Editor is free to download, with in-app purchases available.
Is iSign free?
iSign is free to download, with in-app purchases available.
Which has better reviews, PDF Editor or iSign?
iSign is rated higher. PDF Editor averages 4.6 out of 5 from 331 ratings, while iSign averages 5.0 from 1 ratings.
Do PDF Editor or iSign have ads?
Neither PDF Editor nor iSign shows ads.
Which is updated more often, PDF Editor or iSign?
PDF Editor ships an update every 3 days, and iSign fortnightly. Most recently, PDF Editor was updated on October 12, 2026 and iSign on September 29, 2026.

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