Our take
Pick SigmaOS if mac users who will stay on Personal Free forever at $0 (unlimited workspaces, ad-blocker, limited Airis) while they open a first IcelandOffsite workspace, then Personal Pro at $20/month when they need unlimited Advanced Airis — not Personal Max $30 unless they need more LLM models and unlimited Look it up / Interactive Summaries. Students and educators print 50% off Pro. Pick Zen Browser if people
Best for
SigmaOS A workspace browser you start at a public $
Zen Browser A Firefox window you start at a public $
Free plan
SigmaOS $0 · forever. FAQ: “SigmaOS Personal is free for everyone and anyone, forever.” Card: unlimited workspaces, fast ad-blocker, Airis Assistant (limited)
Zen Browser $0 · ). Download / build from the site and GitHub. No printed Pro / Team / Cloud $ on the marketing pages we fetched
Lowest paid
SigmaOS Personal Pro $20/mo
Zen Browser Not published by the vendor
Next step up
SigmaOS Personal Max $30/mo
Zen Browser
Watch out
SigmaOS Unlimited Airis is paid
Zen Browser Support is a tip, not a second browser
Last checked
SigmaOS 2026-10-23 · sigmaos.com
Zen Browser 2026-10-23 · zen-browser.app
mac users who will stay on Personal Free forever at $0 (unlimited workspaces, ad-blocker, limited Airis) while they open a first IcelandOffsite workspace, then Personal Pro at $20/month when they need unlimited Advanced Airis — not Personal Max $30 unless they need more LLM models and unlimited Look it up / Interactive Summaries. Students and educators print 50% off Pro.
Read the SigmaOS pagepeople who will stay on Free at $0 while they open a first Personal workspace + ChatGPT / YouTube tabs, then optionally tip on Donate — not SigmaOS Pro $20 first unless they want that Mac Airis sidecar, and not Orion+ unless they want Kagi’s WebKit support SKU.
Read the Zen Browser page
