Comparison

LightPDF vs PairInk

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

Head to head
About

LightPDF

This app offers a comprehensive suite of tools for managing PDF documents on your mobile device. It leverages AI to summarize, chat with, and convert PDFs, along with scanning capabilities, text extraction, and editing features. It also includes an ID photo maker and watermark removal.

Highlights
  • AI Chat with PDFs
  • Phone Scanner to PDF
  • PDF to Word/JPG/Excel Converter
  • OCR Text Extraction
  • PDF Editing and Annotation
  • ID Photo Maker
  • Watermark Removal
Features
Read full description

LightPDF, AI-powered, is a must-have PDF toolkit for your mobile device. You can use it to summarize and chat with PDFs and other documents, and quickly get the key information from the files! And it takes advantage of AI to help you easily scan paperwork to PDFs, extract texts and remove specific objects. It can be your PDF converter, editor, reader, on-the-go mobile scanner, cloud-based PDF storage, and ID photo maker. Try LightPDF to convert, OCR, scan, edit, read, annotate, comment, compress, and merge PDFs easily and quickly to get a high-quality result. And its sharing and collaborating feature can help you communicate smoothly with your colleagues on the same PDF document, and improve your teamwork productivity. What LightPDF can do: Smart AI Chat Assistant for PDFs - Ask questions to the chatbot about your file and it will answer you with cited sources - Quickly output results in markdown and table formats - Chat with PDFs, scans, Excel, Word, PPT, and ePub documents Intelligent Phone Scanner - Take photos of your papers, cards, books, and more to turn them into PDF format. Work as your pocket PDF scanner - Extract and copy texts from paper works - Remove handwriting from the test paper - Advanced filter features for better scanning result Powerful PDF Converter with OCR - Convert PDF to Word, JPG, PNG, Excel, PPT, and TXT, as well as turn Word, PPT, Excel, JPG, PNG, and CAD formats to PDF - Equipped with OCR technology to recognize and turn PDF scans and photos into docx, xlsx, pptx, pdf, and txt formats - Convert multiple documents at the same time and quickly get your work done Cloud-based PDF Editor & Reader - Edit, sign, and add images to a PDF file - Highlight, draw markups, and insert notes into PDF - Reduce PDF file size with a few touches - Combine multiple PDF documents into one - Read PDFs, add bookmarks, search and annotate - Print PDFs directly from your devices - Auto-sync PDFs in order to work with PDFs on the go. No more worry about losing data Handy ID Photo Maker - Create ID and passport photos with ease. It allows you to remove the background, change the background color, and produce a new photo with the selected size - Unblur the photo to enhance its quality and make it clear Image Watermark Removal - AI automatically recognizes and removes watermarks from images, eliminating the need for manual smudging like in Photoshop. It is particularly effective for large logos and full-screen watermarks, enhancing learning efficiency. New Way for Teamwork - Share files via links with your team and invite multiple people to view, edit, highlight, sign, and add comments on the same PDF at the same time - Set permissions to keep PDF security under control - Upload the file to the cloud, and access it on any device - Star files as favorites to quickly find and open them Subscriptions will be charged to your credit card through your iTunes account. Your subscription will automatically renew unless canceled at least 24 hours before the end of the current period. After purchase, please manage your subscriptions in the App Store Account Settings. ------------------------------------------------------------------------------- If you need any help or have suggestions on LightPDF, please feel free to contact us. We can't keep making progress without your voice. Email: support@lightpdf.com Customer Service Center: https://lightpdf.com/contact FAQ: https://lightpdf.com/faqs/lightpdf-editor-faq Privacy Policy:https://lightpdf.com/privacy Terms of Service:https://lightpdf.com/terms

About

PairInk

Features
Read full description

PairInk gives your ideas room to grow. Sketch, write notes and organize your work on boards on iPhone and iPad, then connect with the Windows companion over your local Wi-Fi. MAKE YOUR MARK Draw with your finger or Apple Pencil on supported iPads. Switch between pen and highlighter presets, add shapes and arrows, and select objects with a rectangle or a freehand lasso. KEEP YOUR THINKING TOGETHER Add typed Notepad text, bring images and PDF pages onto a board, and keep your work organized in a visual board library. Pin important boards and choose a cards or grid view. CONNECT YOUR SCREENS Find nearby computers or scan a pairing QR code. Once paired, PairInk remembers the computer and can reconnect when both devices are reachable on the same local network. Live syncing requires the Windows companion to be running; connection speed depends on your network and board size. TAKE YOUR WORK WITH YOU Keep boards on your device, export PDFs and save board backups. Board content is stored on your devices; the license service verifies trial and purchase access separately. TRY PAIRINK Start a 7-day trial with up to three active boards. When the trial ends, you can continue viewing and exporting your work. A separate one-time in-app purchase unlocks unlimited boards and editing, including version 1.x updates. The trial does not automatically charge you or turn into a subscription. Pricing is shown in your local App Store currency before purchase. No separate PairInk account is required. Purchases use your Apple Account. Internet access is needed for activation and restoration; Pro access must be refreshed online at least once every 30 days. If your installation identity is lost, contact support with your store receipt for recovery. Windows syncing requires the separately installed PairInk companion and local-network access. Camera access is optional and used only to scan a pairing QR code. Support: jawadsjaber@outlook.com

Screenshots

LightPDF4 screens
PairInk3 screens

Verdict

The call

The clearest difference is update cadence: PairInk at every 6 days against LightPDF's every 2 weeks. PairInk also leads on device support (4 vs 2). On price, ads, in-app purchases and iOS requirement 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. LightPDF sells 9 in-app purchases, starting at $13.99 per 7 days and PairInk sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

LightPDF ships an update every 2 weeks, PairInk every 6 days. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 8 level
LightPDF versus PairInk: the parameters behind the verdict, then further details
ParameterLightPDFPairInk
PriceFreeFree
Rating4.1 (54 ratings) — better—
Positive reviews88.4% of reviews—
Number of ratings54 — better—
Update frequencyEvery 2 weeksEvery 6 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPodiPhone, iPad, iPod, Mac — better
Requires iOS14.0 — better15.0
Further details — not scored
Size113 MB27 MB
Age rating17+4+
DeveloperWangxu Technology Co., LtdJawad Jaber

Bugs and requests

LightPDF

Reported bugs

5 issues
  • App requests more money after payment
  • Paid subscription not unlocking features
  • Trial period charged despite cancellation
  • Scans cut off PDF to 3 pages or under
  • Performance issues

Requested features

3 requests
  • iPad support
  • Edit text in the exact same font
  • More advanced editing features

PairInk

Not enough reviews yet to summarise bugs or requests.

In-app purchases

9 purchases

LightPDF

Subscriptions5
  • LightPDF Weekly Subscription$13.997 Days
  • LightPDF Monthly Subscription2 variants$19.991 Month
  • LightPDF Yearly Subscription$47.991 Year
Show 2 more
  • LightPDF Annual Subscription$49.991 Year
  • LightPDF Yearly Subscription3 Days trial$59.991 Year
One-time4
  • iOS LightPDF - 1 Week$9.99
  • 3-Year Subscription$99.99
  • Mac LightPDF Lifetime Plan$109.99
Show 1 more
  • Buy 3 yrs Get 3 yrs Free$149.99
2 purchases

PairInk

One-time2
  • 7-day TrialFree
  • PairInk Full Unlock$39.00

Questions

Is LightPDF free?
LightPDF is free to download, with in-app purchases available.
Is PairInk free?
PairInk is free to download, with in-app purchases available.
Do LightPDF or PairInk have ads?
Neither LightPDF nor PairInk shows ads.
Which is updated more often, LightPDF or PairInk?
LightPDF ships an update every 2 weeks, and PairInk every 6 days. Most recently, LightPDF was updated on November 7, 2026 and PairInk on October 31, 2026.

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