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SigmaOS vs Crest: catalog facts
SigmaOS	Crest
Freemium A free tier is available. Heavier use moves to a paid subscription.	Free Free and open source under the MPL-2.0 licence.
macOS	macOS, iOS
Tabs live in named workspaces with separate logins, and each one can be marked done or locked, which…	Spaces isolate cookies, history, tabs and credentials per context Chromium and WebKit engines on Mac with per-site rules
It is closed source, macOS-only, and the free tier is limited enough that regular use pushes you to…	Early access software with no independent security audit Mac build is for Apple silicon only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MPL-2.0
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 October 2, 2026

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