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Obsidian vs SigmaOS

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

Option A
Obsidian

Obsidian

Productivity

Sharpen your thinking.

Obsidian is a powerful, local-first knowledge base built on plain Markdown files, with backlinks, graph view, and a rich plugin ecosystem.

Founder
Erica Xu
Founded
2020
Team
1-10
Listing
Free (nofollow)
Listed
May 2026
View Obsidian →
Option B
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 →

See more alternatives

Obsidian alternatives →SigmaOS alternatives →