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Opera vs Sleipnir: catalog facts
Opera	Sleipnir
Free Free to download and use. The software is closed source.	Free Free to download and use. The software is closed source.
Windows, macOS, Linux, Android, iOS	Windows, macOS
Ad blocking, a no-account proxy VPN, workspaces and sidebar messengers all ship in the browser itself rather than…	Right-button mouse gestures cover most navigation, and the tab thumbnails stay usable even with a hundred tabs open.
It is closed source and owned by a Chinese consortium, and the built-in VPN is a browser proxy…	It is closed source, the documentation is largely Japanese, and the macOS build was paused over a Tahoe…
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	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.