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Opera Air vs Helium: catalog facts
Opera Air	Helium
Free Free to use.	Free Free and open source, supported by sponsors.
Windows, macOS	Windows, macOS, Linux
Ads and notifications hidden by default Built-in break and focus prompts	Ad, tracker and cookie banner blocking on by default No telemetry or background requests without consent
Proprietary Focus features may feel unnecessary to users who want a plain browser	Younger project than established privacy browsers Built on Chromium, so it follows Google's engine decisions
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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