Comparison

Polaris PDF Viewer vs PDF Vault

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

Head to head
About

Polaris PDF Viewer

View and manage PDF documents on your mobile device with a stable and optimized viewer. Offers features like text-to-speech, annotation tools, and cloud integration for efficient document handling.

Highlights
  • Mobile-optimized PDF viewer
  • Text-to-speech function
  • Annotation and drawing tools
  • Cloud service integration
  • Night mode and screen dimming
  • Print PDF documents
Features
Read full description

Polaris Office, selected by 90 million users across the world, provides mobile optimized PDF document viewer at the requests of numerous users. ■ Supporting Languages ■ • Supporting 18 global languages including English, French, Arabic, Japanese, Russian, German, Italian, Spanish, etc ■ Main functions ■ Mobile optimized PDF document viewer : Supporting must-have functions to easily view the PDF documents in Mobile. • Landscape mode / Portrait mode / Multi window mode • View per page • Supporting text to speech function (Reading all / Reading from here) • Able to dim the screen and choose background (Providing Night mode and Paper texture) • Annotation List / Drawing Pencil • Able to print PDF documents with multiple options • Supporting text copy function in document Smart managing : Supporting the functions for managing various PDF documents more efficiently. • Able to check all the documents in My device storage & other cloud service (Supporting iCloud, Google Drive, Dropbox) • Able to manage main PDF documents separately through bookmark settings. • Support various sorting methods. (Name order / Date order / Size order etc) • Able to search document you need through search function. ■ Note ■ • Homepage : Polarisoffice.com • Facebook : facebook.com/polarisoffice • Youtube : youtube.com/user/infrawareinc • Inquiry : support@polarisoffice.com • Terms and Conditions and Privacy Policy : www.polarisoffice.com/privacy

About

PDF Vault

This ultra-lightweight application offers a comprehensive suite of PDF tools, including text-to-speech functionality, digital signing, document scanning, organization, and instant translation. It's designed for efficiency and ease of use, saving device space while enhancing productivity for work, study, or personal tasks.

Highlights
  • Text-to-speech for PDFs
  • Digital document signing
  • Scan paper documents to PDF
  • Organize and manage PDF files
  • Instant document translation
  • Ultra-lightweight and fast
Features
Read full description

Your private PDF workspace, built for people who take their documents seriously. Ask your PDFs questions, understand complex documents, translate, scan, sign, listen, and manage your files in one lightweight app. PDF Vault combines powerful PDF tools with a privacy-first approach: your documents stay on your device. ASK YOUR PDF ANYTHING Have a long report, contract, research paper, manual, or other document? Just ask. Ask PDF lets you ask questions about the content of your document and get answers based on the information inside it. Find important details, understand complex sections, summarize information, and explore your documents without searching through page after page. Your documents stay private and are processed on your device. PRIVATE BY DESIGN Your documents are personal. PDF Vault is designed with privacy at its core. Your PDF data never leaves your device. No document uploads are required for the core PDF experience. Your files remain under your control while you work with them. ALL THE PDF TOOLS YOU NEED Listen to PDFs Turn your documents into spoken audio with built-in text-to-speech. Listen while working, commuting, studying, or simply when you prefer to hear rather than read. Translate PDFs Translate documents and understand content in other languages without leaving your PDF workspace. Scan documents Turn paper documents into digital PDFs using your device camera. Built-in OCR helps make scanned documents searchable and usable. Sign PDFs Sign documents quickly and conveniently. Add your signature and complete documents without printing them. Read and organize Open, read, manage, and organize your PDF files in a clean, focused workspace designed to stay out of your way. LIGHTWEIGHT AND FOCUSED PDF Vault is built to give you the tools you actually need without turning your device into a document-management maze. Whether you are working with contracts, invoices, academic papers, reports, forms, manuals, or personal documents, PDF Vault keeps everything you need close at hand. FOR WORK, STUDY, AND EVERYDAY DOCUMENTS Use PDF Vault at work to understand reports and contracts. Use it at university to explore research papers and study materials. Use it at home to manage forms, manuals, receipts, and other important documents. ONE PRIVATE WORKSPACE FOR YOUR PDFs Read. Ask. Translate. Scan. Sign. Listen. Organize. PDF Vault brings essential PDF tools together while keeping privacy at the center of the experience. PDF Vault Unlimited gives you unlimited access to all PDF Vault features while directly supporting our mission to provide the best privacy-first PDF tool where your data never leaves your device. Terms of Service: https://macmonsters.com/pdf-reader-terms-of-service.html

Screenshots

Polaris PDF Viewer4 screens
PDF Vault2 screens

Verdict

The call

The clearest difference is review sentiment: PDF Vault at 50% against Polaris PDF Viewer's 0%. PDF Vault also leads on rating (5.0 vs 4.4). Polaris PDF Viewer's advantage is in-app purchases (none vs 2) and ratings volume (49 vs 3). On price, update cadence, ads and device support 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 Vault sells 2 in-app purchases, starting at $4.99 per month. Polaris PDF Viewer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

PDF Vault holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Polaris PDF Viewer has 49 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 0% of Polaris PDF Viewer's written reviews are positive against 50% of PDF Vault's.

UpkeepUpdate frequency

Polaris PDF Viewer ships an update every 5 weeks, PDF Vault every 3 weeks. Both last shipped on October 24, 2026.

Scorecard6 real differences · 4 level
Polaris PDF Viewer versus PDF Vault: the parameters behind the verdict, then further details
ParameterPolaris PDF ViewerPDF Vault
PriceFreeFree
Rating4.4 (49 ratings)5.0 (3 ratings) — better
Positive reviews0.0% of reviews50.0% of reviews — better
Number of ratings49 — better3
Update frequencyEvery 5 weeksEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS10.0 — better18.1
Further details — not scored
Size94 MB4 MB
Age rating4+4+
DeveloperPolaris Office Corp.Dmytro Skorokhod

Customer experience

Polaris PDF Viewer

All ratings47 ratings
Positive87.2%
Neutral2.1%
Negative10.6%
Written reviews3 reviews
Positive0.0%
Neutral33.3%
Negative66.7%

PDF Vault

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews6 reviews
Positive50.0%
Neutral16.7%
Negative33.3%

In-app purchases

None

Polaris PDF Viewer

No in-app purchases

2 purchases

PDF Vault

Subscriptions2
  • Mox PDF Tool Unlimited Monthly7 Days trial$4.991 Month
  • Mox PDF Tool Unlimited Annually7 Days trial$19.991 Year

Questions

Is Polaris PDF Viewer free?
Polaris PDF Viewer is free to download, with no in-app purchases.
Is PDF Vault free?
PDF Vault is free to download, with in-app purchases available.
Which has better reviews, Polaris PDF Viewer or PDF Vault?
PDF Vault is rated higher. Polaris PDF Viewer averages 4.4 out of 5 from 49 ratings, while PDF Vault averages 5.0 from 3 ratings.
Do Polaris PDF Viewer or PDF Vault have ads?
Neither Polaris PDF Viewer nor PDF Vault shows ads.
Which is updated more often, Polaris PDF Viewer or PDF Vault?
Polaris PDF Viewer ships an update every 5 weeks, and PDF Vault every 3 weeks. Most recently, Polaris PDF Viewer was updated on October 24, 2026 and PDF Vault on October 24, 2026.

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