Comparison

PDF Scanner Document Converter vs Sign Documents

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

Head to head
About

PDF Scanner Document Converter

Transform your iPhone into a powerful document scanner and converter. Easily scan paper documents to PDF, convert them to various formats like Word or JPG, and then sign, annotate, or share them. Keep all your important files organized and secure locally on your device.

Highlights
  • AI-enhanced document scanning
  • Automatic page straightening
  • Multi-language OCR text recognition
  • Digital signature and annotation tools
  • Export to PDF, JPG, DOC, TXT
  • Local document storage and security
  • Batch import and advanced editing (Premium)
Features
Read full description

Scan Master turns your iPhone into a document scanner, PDF converter, and OCR text reader. Scan paper to PDF in seconds, convert it to Word, JPG, or TXT, then sign, annotate, and share. Contracts, invoices, receipts, tax returns, medical records, notes, textbook pages. Everything stays sharp and organized. Get perfect scans - AI Enhanced clears shadows, glare, and desk lamp reflections, so a page shot in a normal room still comes out clean - Straighten fixes the angle for you, no lining the page up perfectly or holding the phone flat - Switch between color, grayscale, and high-contrast black and white depending on what you are scanning - Set the look once and apply it to the whole document instead of page by page Multi-language text recognition - Pull the text out of a scan so you can search, copy, and reuse it instead of retyping the page - Detects the language for you, or pick one yourself - Fix a typo or reformat the result before you send it, right inside the app - Copy it as plain text, or export as PDF, DOC, or TXT Sign and mark up without printing - Sign a contract and send it back in a minute, no printer, no scanner, no trip to the office - Draw your signature once and reuse it on everything after that - Highlight the clause that matters, or leave a note for whoever reads it next - Add a stamp or your own watermark before the file leaves your phone Export in the format you need - PDF to file it, JPG to share it, DOC or TXT when you still need to edit it - Send only the pages that matter instead of the whole document - Adjust size and quality so the file is small enough to email - Straight out to email, AirDrop, print, or Files Your documents stay on your device Tax returns, contracts, medical records, and ID documents are not the kind of files that belong on someone else's server. Scan Master scans, processes, and stores everything locally on your iPhone. - Your documents are never uploaded, and no account is required - Text recognition runs on your iPhone, not in the cloud - Lock individual documents behind a password - Add encryption to any file before you export it Scan Master Premium Scan Master is free to use. Premium unlocks batch file import, watermark-free export, file encryption, OCR result export, and advanced editing: signatures, markup, comments, stamps, and custom watermarks. Free users can export one page at a time with a Scan Master watermark. Selecting multiple pages requires Premium. Privacy Policy: https://scanmaster.io/scan-master-privacy-policy.html Terms of Use: https://scanmaster.io/scan-master-terms-conditions.html Questions or suggestions? Email us at getsupport@scanmaster.io.

About

Sign Documents

Easily add signatures, text, and images to your PDF documents. This user-friendly tool offers real-time saving and an intuitive interface for quick document personalization. Ideal for students and professionals needing efficient PDF editing.

Highlights
  • Add signatures
  • Insert text
  • Add images
  • Real-time saving
  • Intuitive interface
  • Personalize documents
Features
Read full description

PDF Editor, a powerful and user-friendly tool designed to enhance your productivity. With this app, you can easily add signatures, text, and images to your PDF files. Our PDF Editor App allows you to personalize your documents in a few simple steps. Need to sign a document? No problem. You can add your signature swiftly and save it for future use. Want to annotate or add comments? You can type in text anywhere on the document. Need to add images? You can insert pictures with ease and adjust their size and position to fit your needs. But that's not all. Our app is designed with a clean and intuitive interface, making it easy even for beginners to navigate and use. Plus, all your edits are saved in real-time, ensuring you won't lose any changes. Whether you're a student, a professional, or someone who needs to work with PDFs, our PDF Editor App is the perfect tool for you. Download it now and experience the convenience and efficiency it brings to your work and daily life." Feel free to modify this to better suit your app's features and target audience. SUBSCRIPTION INFO: Subscribe to take advantage of the features described above. • Subscription length: monthly, yearly • Your payment will be charged to your iTunes Account as soon as you confirm your purchase. • You can manage your subscriptions and turn off auto-renewal from 'Settings > iTunes Account & App Store > Apple ID > Subscriptions' • Your subscription will renew automatically unless you turn off auto-renew at least 24 hours before the end of the current period. • The cost of renewal will be charged to your account 24 hours before the end of the current period. • When canceling a subscription, your subscription will stay active until the end of the period. Auto-renewal will be disabled, but the current subscription will not be refunded. Terms of use: https://docs.qq.com/doc/DRWhmR0VSaXJJWWVs Privacy policy: https://docs.qq.com/doc/DRWhmR0VSaXJJWWVs Inquiry: help4pdfsign@gmail.com

Screenshots

PDF Scanner Document Converter4 screens
Sign Documents3 screens

Verdict

The call

PDF Scanner Document Converter and Sign Documents both sit at 4.5 stars, but that hides the real split: 88% of Sign Documents's written reviews are positive against 32% of PDF Scanner Document Converter's. Sign Documents also leads on ads (none vs shown). PDF Scanner Document Converter's advantage is update cadence (every 2 weeks vs every 6 weeks) and ratings volume (549 vs 68). 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. PDF Scanner Document Converter sells 5 in-app purchases, starting at $9.99 per month and Sign Documents sells 2 in-app purchases, starting at $8.99 per month. 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 — 4.5 for PDF Scanner Document Converter against 4.5 for Sign Documents. That said, the two scores are not equally well evidenced: PDF Scanner Document Converter has 549 ratings behind it against 68, so its average is the more settled of the two. Written reviews are what separate them: 32% of PDF Scanner Document Converter's written reviews are positive against 88% of Sign Documents's.

UpkeepUpdate frequency

PDF Scanner Document Converter ships an update every 2 weeks, Sign Documents every 6 weeks. The most recent releases landed on November 6, 2026 and November 8, 2026 respectively.

Scorecard4 real differences · 6 level
PDF Scanner Document Converter versus Sign Documents: the parameters behind the verdict, then further details
ParameterPDF Scanner Document ConverterSign Documents
PriceFreeFree
Rating4.5 (549 ratings) — better4.5 (68 ratings)
Positive reviews31.9% of reviews88.2% of reviews — better
Number of ratings549 — better68
Update frequencyEvery 2 weeks — betterEvery 6 weeks
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhoneiPhone, iPod — better
Requires iOS16.015.0 — better
Further details — not scored
Size151 MB9 MB
Age rating4+4+
Developer兰 陈晓峰 刘

Customer experience

PDF Scanner Document Converter

All ratings547 ratings
Positive87.9%
Neutral3.1%
Negative9.0%
Written reviews47 reviews
Positive31.9%
Neutral0.0%
Negative68.1%

Sign Documents

All ratings68 ratings
Positive86.8%
Neutral4.4%
Negative8.8%
Written reviews34 reviews
Positive88.2%
Neutral0.0%
Negative11.8%

Bugs and requests

PDF Scanner Document Converter

Reported bugs

6 issues
  • App crashes on launch
  • Scan quality is unreadable
  • App keeps asking to sign up despite active account
  • Files not emailing properly
  • Incompatibility with iPhone 5S
Show 1 more
  • Scanning fails to process documents

Requested features

4 requests
  • Easy in-app cancellation option
  • Color scan option
  • Genuine free trial without credit card requirement
  • Better customer support channels

Sign Documents

Not enough reviews yet to summarise bugs or requests.

In-app purchases

5 purchases

PDF Scanner Document Converter

Subscriptions5
  • Monthly Plan7 Days trial$9.991 Month
  • PDF Scanner Converter$9.997 Days
  • Weekly Plan3 Days trial$9.997 Days
Show 2 more
  • PDF Document Scanner3 Days trial$59.991 Year
  • Document Scanner App$69.991 Year
2 purchases

Sign Documents

Subscriptions1
  • PDF Editor PRO3 Days trial$8.991 Month
One-time1
  • Forever Pro$14.99

Questions

Is PDF Scanner Document Converter free?
PDF Scanner Document Converter is free to download, with in-app purchases available.
Is Sign Documents free?
Sign Documents is free to download, with in-app purchases available.
Which has better reviews, PDF Scanner Document Converter or Sign Documents?
PDF Scanner Document Converter is rated higher. PDF Scanner Document Converter averages 4.5 out of 5 from 549 ratings, while Sign Documents averages 4.5 from 68 ratings.
Do PDF Scanner Document Converter or Sign Documents have ads?
PDF Scanner Document Converter shows ads; Sign Documents does not.
Which is updated more often, PDF Scanner Document Converter or Sign Documents?
PDF Scanner Document Converter ships an update every 2 weeks, and Sign Documents every 6 weeks. Most recently, PDF Scanner Document Converter was updated on November 6, 2026 and Sign Documents on November 8, 2026.

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