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