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Notion Calendar vs SigmaOS

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

Option A
Notion Calendar

Notion Calendar

Productivity

Time blocking for the time-strapped.

Notion Calendar (formerly Cron) is a beautiful keyboard-first calendar with multi-account, scheduling links, and Notion integration.

Founder
Raphael Schaad
Founded
2018
Team
11-50
Listing
Free (nofollow)
Listed
May 2026
View Notion Calendar →
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

Notion Calendar alternatives →SigmaOS alternatives →