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SigmaOS vs Pretzel

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
Pretzel

Pretzel

Productivity

A modern, end-to-end-encrypted email client.

Pretzel is a privacy-first email and calendar client for power users — built by a small indie team.

Founded
2023
Team
1-10
Listing
Free (nofollow)
Listed
May 2026
View Pretzel →

See more alternatives

SigmaOS alternatives →Pretzel alternatives →