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Otter Browser vs Opera: catalog facts
Otter Browser	Opera
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free to download and use. The software is closed source.
Windows, Linux	Windows, macOS, Linux, Android, iOS
Brings traditional desktop browser controls into a Qt application.	Ad blocking, a no-account proxy VPN, workspaces and sidebar messengers all ship in the browser itself rather than…
Some planned features remain unfinished.	It is closed source and owned by a Chinese consortium, and the built-in VPN is a browser proxy…
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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