Comparison

iSilo vs Astrill VPN Client

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

Head to head
About

iSilo

Read various document formats including iSilo, Palm Doc, and plain text. Access a vast library of content, organize your files, and customize viewing options for a personalized reading experience. Transfer documents easily via USB, Wi-Fi, or web download.

Highlights
  • Supports iSilo, Palm Doc, and plain text formats
  • Extensive document library and creation tools
  • Organize documents with categories and favorites
  • Customizable viewing options (font, colors, themes)
  • Autoscroll, full-screen, and orientation support
  • Text search, copy, and annotation
  • Multiple document transfer methods (USB, Wi-Fi, Web)
Features
Read full description

Document reader for viewing document files in iSilo, Palm Doc, and plain text format. Bonus: Get the complete edition of the CIA World Factbook for free, with layout optimized for viewing on your iPhone, iPod touch, or iPad using iSilo. In addition to full information for all the countries of the world, the complete edition contains appendixes, reference maps, field cross-reference links, rank order pages, country profiles for all fields, enlarged flag pages with descriptions, enlarged country maps, and more. Tens of thousands of documents, eBooks, reference works, non-fiction, fiction available for ready download through the iSilo library. Create your own documents too. Document list provides recently viewed list of documents, ability to categorize documents into single or multiple categories, marking of favorite folders for easy access, and file explorer access to entire document directory with document file management operations, such as copying/moving/deleting/renaming document files and creating/deleting/renaming folders. Document viewing options provide for font size and typeface selection, along with customizable color themes with selectable background and text colors. Autoscroll with adjustable speed, view documents in full screen, complete support for both portrait and landscape orientations and rotation. Jump history for easily navigating back and forth when following hyperlinks and jumping to different locations in the document. Documents open to last viewed location. Bookmarks. Document text search. Select a range of text to copy or annotate it with a comment and choice of color highlighting. Easily transfer documents to your device via USB, via Wi-Fi by connecting to iSilo's built-in file server from your computer, or via download from the Web. Configure the screen to perform actions when tapped. Assignable actions include scrolling, full screen mode, font sizing, among many others. The latest version adds the ability to view additional file types. Additional image file types include .jpg, .png, .gif, .tif, among others. Additional document file types include .pdf, .htm, Word (.doc, .docx), Excel (.xls, .xlsx), and PowerPoint (.ppt, .pptx). See the manual for more details on the additional file type support.

About

Astrill VPN Client

Secure your mobile device's internet connection with military-grade encryption. Access servers in over 60 countries and enjoy features like "Always On" and "Smart Mode" for optimized performance and privacy.

Highlights
  • One-click VPN connection
  • Servers in 110+ cities, 60+ countries
  • Military-grade encryption
  • Always On VPN mode
  • Smart Mode to exclude local sites
  • Unlimited data transfer
Features
Read full description

What is Astrill ? ***************************************** Astrill iOS VPN Client connects your mobile device with just one click to our secure VPN network. Pick a server in more than 110 cities in over 60 countries. All traffic from your device is protected with military grade encryption against eavesdropping and hackers. Astrill iOS VPN client supports "Always On" VPN mode - whenever you use Internet on your device, it will automatically connect to VPN in a second! When device is not in use, VPN will be disconnected, thus not waste your battery. Astrill iOS VPN client supports "Smart Mode" - you can exclude local web sites from VPN to speed up access. IMPORTANT: Accounts purchased from the App Store will work only on your iPhone or iPad devices. If you need to use VPN on your PC, Mac or other devices, please purchase full account from our web site instead. Why do I need Astrill VPN ? ***************************************** Whenever you use Internet at public places - airports, hotels, cafes, libraries, schools... you are at risk - your personal data can be easily stolen and misused by hackers. Astrill VPN protects you whenever you are online and makes it impossible for anyone to get a hold of your personal information transmitted over the Internet. If you are a frequent or occasional traveler, VPN protection is a must. Is Astrill VPN fast ? ***************************************** Astrill runs its own global network of VPN servers in over 60 countries around the world. We use bare-metal hardware (not shared VPS servers like most of our competitors), to make sure your VPN is always fast, servers are not overloaded and your security never compromised. With a single VPN account you get access to all our servers and you can switch servers with a single click unlimited number of times. We do not have limitation on amount of data transferred - you can download or stream online content as much as you wish through our VPN. Why should I choose Astrill ? ***************************************** Astrill has been in business since 2009 and our team of security experts is constantly working on developing innovative technologies to make the Internet more secure place. Our technology uses AES 256-bit and ChaCha20 encryption which makes it one of the most secure. We do not utilize outdated and insecure PPTP or L2TP protocols like most of our competitors. Fast speed, high security, plenty of servers and easy to use software for all popular devices is what makes Astrill number one choice for Internet protection by thousands of customers in more than 180 countries around the world. You can apply for Astrill free trial account and see yourself Astrill in action. Does Astrill work on my desktop/laptop computer too ? ************************************************************** Yes, sure! We have plug-and-play technology for Windows, Macintosh, Linux, smart phones as well as DD-WRT/Tomato/AsusWRT-Merlin WiFi routers. We support variety of VPN technologies including: OpenVPN, Wireguard, StealthVPN, OpenWeb, PPTP, L2TP/IPSec, IPSec, IKEv2, SSTP and AnyConnect. Our service works on virtually any device supporting these standard VPN protocols. You can run Astrill on your WiFi router and connect all devices in your home or office to our secure VPN, for example all your phones, Windows, Mac and Linux computers, Apple TV, Smart TVs, etc... For more information about the features we offer, please check our web site. We also have a video section which demonstrates some features. What if I run into problems ? ***************************************** If you run into any issues when using our VPN service, our kind and high qualified customers service is at your disposal 24h/7/365 via live chat, email and phone.

Screenshots

iSilo4 screens
Astrill VPN Client4 screens

Verdict

The call

The clearest difference is price: Astrill VPN Client at Free against iSilo's $9.99. Astrill VPN Client also leads on ratings volume (608 vs 50). iSilo's advantage is in-app purchases (none vs 2) and review sentiment (51% vs 24%). On rating, ads, device support 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

Astrill VPN Client is free to download; iSilo costs $9.99 up front. Astrill VPN Client sells 2 one-off in-app purchases. iSilo asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 3.8 for iSilo against 3.7 for Astrill VPN Client. That said, the two scores are not equally well evidenced: Astrill VPN Client has 608 ratings behind it against 50, so its average is the more settled of the two. Written reviews are what separate them: 51% of iSilo's written reviews are positive against 24% of Astrill VPN Client's.

UpkeepUpdate frequency

iSilo ships an update every 3 weeks, Astrill VPN Client every 4 months. Both last shipped on September 28, 2026.

Scorecard7 real differences · 4 level
iSilo versus Astrill VPN Client: the parameters behind the verdict, then further details
ParameteriSiloAstrill VPN Client
Price$9.99Free — better
Rating3.8 (50 ratings) — better3.7 (608 ratings)
Positive reviews50.6% of reviews — better23.9% of reviews
Number of ratings50608 — better
Update frequencyEvery 3 weeks — betterEvery 4 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
Best chart rank#115 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better9.0
Further details — not scored
Size13 MB17 MB
Age rating4+4+
DeveloperDC & Co.Veloxee Corp.

Customer experience

iSilo

All ratings50 ratings
Positive68.0%
Neutral10.0%
Negative22.0%
Written reviews269 reviews
Positive50.6%
Neutral16.7%
Negative32.7%

Astrill VPN Client

All ratings608 ratings
Positive68.1%
Neutral5.8%
Negative26.2%
Written reviews1,480 reviews
Positive23.9%
Neutral9.7%
Negative66.5%

User reviews

iSilo

From 50 App Store ratings

What we love

  • 💻 Works well with Christian books
  • 📚 Excellent for reading documents with embedded hyperlinks
  • ⚡ Fast and smooth on many devices
  • 🙌 Hands down a life-saving app
  • 🏆 Basic but wonderful functionality

Room to improve

  • 🐛 Crashes upon opening
  • 🐛 Unable to download new material since 2017
  • 🐛 Crashes when trying to open code-protected file
  • 🐛 Scrolling issues and performance problems
  • 🤖 Outdated and abandoned by developers

Astrill VPN Client

From 608 App Store ratings

What we love

  • 🚀 Fast and reliable connection
  • 🔒 Stable and secure VPN
  • 👍 Works well in China
  • 💡 Comprehensive server options

Room to improve

  • 🐛 Buggy and unreliable mobile app
  • 🔋 Drains battery quickly on mobile
  • 👎 Inconsistent and unstable connectivity
  • 💰 Overpriced for the quality

Bugs and requests

iSilo

Reported bugs

5 issues
  • Crashes when trying to open certain file formats
  • Displaying issues with Palm format (PDB) files
  • Inability to download files from Dropbox
  • Text going off-screen after recent updates
  • Bookmarks and annotations not syncing across devices

Requested features

5 requests
  • Add dark mode feature
  • Improve text highlighting and annotation capabilities
  • Implement cloud sync and cross-device support
  • Modernize the user interface
  • Add support for iOS Files app

Astrill VPN Client

Reported bugs

3 issues
  • Frequent disconnections and inability to turn off VPN
  • Login screen freezes and crashes
  • Incompatibility issues with newer iOS versions

Requested features

3 requests
  • Improved mobile app with better stability and user experience
  • More transparent communication about service disruptions
  • Loyalty discounts for long-term subscribers

In-app purchases

None

iSilo

No in-app purchases

2 purchases

Astrill VPN Client

One-time2
  • 1 month$29.99
  • 1 year$179.99

Questions

Is iSilo free?
iSilo costs $9.99, with no in-app purchases.
Is Astrill VPN Client free?
Astrill VPN Client is free to download, with in-app purchases available.
Which has better reviews, iSilo or Astrill VPN Client?
iSilo is rated higher. iSilo averages 3.8 out of 5 from 50 ratings, while Astrill VPN Client averages 3.7 from 608 ratings.
Do iSilo or Astrill VPN Client have ads?
Neither iSilo nor Astrill VPN Client shows ads.
Which is updated more often, iSilo or Astrill VPN Client?
iSilo ships an update every 3 weeks, and Astrill VPN Client every 4 months. Most recently, iSilo was updated on September 28, 2026 and Astrill VPN Client on September 28, 2026.

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