Skip to content

Okular vs Trillian

Professional comparison and analysis to help you choose the right software solution for your needs.

Okular icon
Okular
Trillian icon
Trillian

Okular vs Trillian: The Verdict

⚡ Summary:

Okular: Okular is a versatile document viewer software for KDE. It supports viewing PDFs, EPUBs, ODT, and other document formats. Okular allows annotating, highlighting, commenting on documents as well as filling forms.

Trillian: Trillian is an instant messaging application that supports multiple protocols in one interface, including AIM, ICQ, MSN, Yahoo Messenger, and more. It allows connecting to multiple chat networks at once from a single app.

Both tools serve their respective audiences. Compare the features, pricing, and user ratings above to determine which best fits your needs.

Last updated: May 2026 · Comparison by Sugggest Editorial Team

Feature Okular Trillian
Sugggest Score — —
Category Office & Productivity Social & Communications
Pricing Free —

Product Overview

Okular
Okular

Description: Okular is a versatile document viewer software for KDE. It supports viewing PDFs, EPUBs, ODT, and other document formats. Okular allows annotating, highlighting, commenting on documents as well as filling forms.

Type: software

Pricing: Free

Trillian
Trillian

Description: Trillian is an instant messaging application that supports multiple protocols in one interface, including AIM, ICQ, MSN, Yahoo Messenger, and more. It allows connecting to multiple chat networks at once from a single app.

Type: software

Key Features Comparison

Okular
Okular Features
  • Supports viewing PDF, PostScript, DjVu, CHM, XPS, ePub and other formats
  • Allows annotating, highlighting and adding comments to PDFs
  • Has different view modes like single page, facing, overview grid
  • Supports tabs for opening multiple documents
  • Has presentation mode for slideshows
  • Can fill interactive PDF forms
  • Allows saving filled forms as PDF or text
  • Has search functionality to find text in documents
  • Can encrypt PDF files
  • Has document information and metadata viewer
  • Supports table of contents navigation
  • Has different reflow modes for reading ePubs
  • Can print documents to system printer
Trillian
Trillian Features
  • Supports multiple chat protocols in one interface
  • Connect to AIM, ICQ, MSN, Yahoo Messenger and more all at once
  • Customizable interface and themes
  • Tabbed conversations
  • Send files and links
  • Encrypted chats
  • Group chats
  • Offline messaging

Pros & Cons Analysis

Okular
Okular

Pros

  • Free and open source
  • Clean and intuitive interface
  • Good performance with large PDFs
  • Lots of annotation and markup tools
  • Supports many document formats
  • Available on Linux, Windows, macOS

Cons

  • Limited format support compared to some alternatives
  • Annotation features may be limited for some users
  • No cloud storage integration
  • Less features than paid alternatives
Trillian
Trillian

Pros

  • Consolidates multiple chat apps into one
  • Cross-platform support
  • Free basic version available
  • Open source codebase

Cons

  • Some protocol support can be buggy
  • Limited features compared to official apps
  • Mobile app lags behind desktop version

Pricing Comparison

Okular
Okular
  • Free
Trillian
Trillian
  • Not listed

Related Comparisons

SumatraPDF
vs Okular vs Trillian

Learn More About Each Product

Okular
Okular
Reviews, pricing & alternatives →
Trillian
Trillian
Reviews, pricing & alternatives →

Ready to Make Your Decision?

Explore more software comparisons and find the perfect solution for your needs

Okular Alternatives
Trillian Alternatives
Browse More Software