Comparison

iSilo vs OptimalWork

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
Currently charting
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

OptimalWork

This app helps you overcome procrastination, anxiety, and distraction by applying a new psychology of growth to your daily work. Achieve new heights of productivity, focus, and skill by approaching challenges as opportunities for profound development.

Highlights
  • Psychology of growth approach
  • Overcome procrastination
  • Reduce anxiety and distraction
  • Enhance productivity and focus
  • Skill development
  • Daily work application
Features
Read full description

The OptimalWork App is based on a revolutionary new psychology of growth. We'll teach you how to approach every challenge you face as a moment of profound growth. Not only that, you can apply everything in your daily work to overcome procrastination, anxiety, and distraction and achieve new heights of productivity, focus, and skill. Terms of Use - https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

iSilo4 screens
OptimalWork4 screens

Verdict

The call

The clearest difference is review sentiment: OptimalWork at 100% against iSilo's 51%. OptimalWork also leads on price (Free vs $9.99) and rating (4.8 vs 3.8). iSilo's advantage is in-app purchases (none vs 8) and chart position (#93 vs unranked). On ratings volume, 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

OptimalWork is free to download; iSilo costs $9.99 up front. OptimalWork sells 8 in-app purchases, starting at $18.95 per month. iSilo asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

OptimalWork holds the better App Store score, 4.8 against 3.8. Both are backed by a comparable volume of ratings — 50 and 19 respectively. Written reviews point the same way: 51% of iSilo's written reviews are positive against 100% of OptimalWork's.

UpkeepUpdate frequency

iSilo ships an update every 3 weeks, OptimalWork fortnightly. The most recent releases landed on September 28, 2026 and September 21, 2026 respectively.

Scorecard7 real differences · 4 level
iSilo versus OptimalWork: the parameters behind the verdict, then further details
ParameteriSiloOptimalWork
Price$9.99Free — better
Rating3.8 (50 ratings)4.8 (19 ratings) — better
Positive reviews50.6% of reviews100.0% of reviews — better
Number of ratings50 — better19
Update frequencyEvery 3 weeksFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
Best chart rank#93 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS8.0 — better15.0
Further details — not scored
Size13 MB82 MB
Age rating4+4+
DeveloperDC & Co.OptimalWork

Customer experience

iSilo

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

OptimalWork

All ratings19 ratings
Positive94.7%
Neutral0.0%
Negative5.3%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

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

OptimalWork

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

iSilo

No in-app purchases

8 purchases

OptimalWork

Subscriptions8
  • Basic - Student Monthly$18.951 Month
  • Basic - Monthly$24.951 Month
  • Premium - Student Monthly$35.951 Month
Show 5 more
  • Premium - Monthly$49.951 Month
  • Basic - Student Yearly$149.991 Year
  • Basic - Yearly$199.991 Year
  • Premium - Student Yearly$274.991 Year
  • Premium - Yearly$359.991 Year

Questions

Is iSilo free?
iSilo costs $9.99, with no in-app purchases.
Is OptimalWork free?
OptimalWork is free to download, with in-app purchases available.
Which has better reviews, iSilo or OptimalWork?
OptimalWork is rated higher. iSilo averages 3.8 out of 5 from 50 ratings, while OptimalWork averages 4.8 from 19 ratings.
Do iSilo or OptimalWork have ads?
Neither iSilo nor OptimalWork shows ads.
Which is updated more often, iSilo or OptimalWork?
iSilo ships an update every 3 weeks, and OptimalWork fortnightly. Most recently, iSilo was updated on September 28, 2026 and OptimalWork on September 21, 2026.

Other comparisons