Our take
Pick Dia if people who will stay on Better Browser Free (no AI) while they open a first Tuesday Brief / Launch handoff window, then Better Answers when they need Ask on any page — not Better Days $100 first unless they need Morning Brief / 6× tasks / recaps. 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
Best for
Dia A work browser you start at a public $
SigmaOS A workspace browser you start at a public $
Free plan
Dia 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
Dia Better Answers $10/mo
SigmaOS Personal Pro $20/mo
Next step up
Dia Usage credits $20
SigmaOS Personal Max $30/mo
Watch out
Dia Better Browser has no AI
SigmaOS Unlimited Airis is paid
Last checked
Dia 2026-10-23 · diabrowser.com/pricing
SigmaOS 2026-10-23 · sigmaos.com
people who will stay on Better Browser Free (no AI) while they open a first Tuesday Brief / Launch handoff window, then Better Answers when they need Ask on any page — not Better Days $100 first unless they need Morning Brief / 6× tasks / recaps.
Read the Dia pagemac 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
