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