Pick ChatGPT Atlas if
people who installed Atlas and still need to export bookmarks, or who want the historical product note.
Read the ChatGPT Atlas pageChatGPT Atlas vs SigmaOS
Our take
Pick ChatGPT Atlas if people who installed Atlas and still need to export bookmarks, or who want the historical product note. 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
Best for
ChatGPT Atlas People who installed Atlas and still need to export bookmarks, or who want the historical
SigmaOS A workspace browser you start at a public $
Free plan
ChatGPT Atlas No free plan
SigmaOS $0 · forever. FAQ: “SigmaOS Personal is free for everyone and anyone, forever.” Card: unlimited workspaces, fast ad-blocker, Airis Assistant (limited)
Lowest paid
ChatGPT Atlas Plus $20/mo
SigmaOS Personal Pro $20/mo
Next step up
ChatGPT Atlas Pro 100 / 200 / 500 $100/mo
SigmaOS Personal Max $30/mo
Coding agent
ChatGPT Atlas Agent + Tab inside the editor
SigmaOS
Watch out
ChatGPT Atlas Scheduled stop: 2026-08-09
SigmaOS Unlimited Airis is paid
Last checked
ChatGPT Atlas 2026-10-22 · help.openai.com
SigmaOS 2026-10-23 · sigmaos.com
Which one, then?
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.
Read the SigmaOS page