It works on Linux-based operating systems, FreeBSD, OpenBSD, macOS, Haiku, RISC OS, OS/2, and Windows platforms.

The web browser was designed to have integration with the KDE Plasma and Unity desktop environments.

[9] Otter Browser has a built in feed reader for RSS and Atom,[10] note taking utility, and cookie management accessible from a sidebar.

[3][11] Tab grouping, form auto-complete, extensions support, and a mail client are planned to be implemented in future versions of the browser.

Praise has been brought towards its aim to recreate classic Opera features and modularity.