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SigmaOS vs Tana

Side-by-side comparison of two indie startups from the Startup Spotlight directory.

Option A
SigmaOS

SigmaOS

Productivity

The web is your operating system.

SigmaOS is an indie macOS browser built around workspaces and split-screen — a quieter Arc alternative from a small Berlin team.

Founder
Mahyad Ghassemibouyaghchi
Founded
2020
Team
1-10
Listing
Free (nofollow)
Listed
May 2026
View SigmaOS →
Option B
Tana

Tana

Productivity

A computer for your mind.

Tana is a structured note-taking and knowledge-management tool with a powerful supertag system and AI features.

Founder
Tarjei Vassbotn
Founded
2021
Team
11-50
Listing
Free (nofollow)
Listed
May 2026
View Tana →

See more alternatives

SigmaOS alternatives →Tana alternatives →