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Directory Opus vs Fileside: catalog facts
Directory Opus	Fileside
Paid A paid licence is required after the trial.	Paid Paid licence with a free trial.
Windows	Windows, macOS
Deeply configurable layouts, toolbars and scripted commands Built-in FTP, archive handling and a very strong batch rename	Tiled multi-pane layouts saved per project Keyboard palette for jumping between folders
Paid licence with no free tier The number of options is overwhelming at first	Paid after the trial No Linux version
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.