Cal.com Blog company blog

Cal.com is going closed source

by Bailey Pumfleet cal.com published 2026-04-14

Cal.com goes closed source after 5 years. Here’s why rising AI-driven security risks and vulnerability discovery are forcing us to protect customer data.

Points

391

HN comments

317

Submissions

1

Cited by

0 commenters

Tech Industry & BusinessOpen Source2026

Related posts from the same era

Slack has raised our charges by $195k per year

Mahad Kalam20253,406 points1,470 comments details

Statement from Dario Amodei on our discussions with the Department of War

Anthropic20262,920 points1,579 commentscited by 14 details

Claude Fable 5

Anthropic20262,626 points2,159 commentscited by 10 details

Motorola announces a partnership with GrapheneOS

Motorola News20262,358 points884 commentscited by 10 details

Claude Opus 4.6

Anthropic20262,346 points1,031 commentscited by 9 details

.name Termination

Neil Fraser20262,230 points547 commentscited by 4 details