Cal.com is an open source alternative to Calendly. Open scheduling infrastructure: booking links, team routing, and round-robin. Use hosted Cal.com or self-host the open source community edition, Cal.diy. MIT licensed, 47.4k GitHub stars, hosted version available, self-host with Docker, no terminal required to start, and last released 2026-03-01.
Open scheduling infrastructure: booking links, team routing, and round-robin. Use hosted Cal.com or self-host the open source community edition, Cal.diy.
In the product
Should you switch?
Individuals and teams who want scheduling infrastructure they fully control: shareable booking links, team round-robin, and event types, with the option to use the managed cal.com platform or self-host the community edition.
You need enterprise features (teams, organizations, SSO/SAML, workflows, insights) out of the box without a Cal.com paid plan: the community edition (Cal.diy) removes all enterprise and commercial code by design.
The repository is MIT-licensed but Cal.com is open-core: teams, organizations, SSO, and enterprise workflows live in the closed commercial tier, not in the community edition. Self-hosting Cal.diy requires Docker, PostgreSQL, and manual generation of secret keys (NEXTAUTH_SECRET, CALENDSO_ENCRYPTION_KEY); the README explicitly warns this is intended for personal, non-production use and requires advanced server administration knowledge.
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Community proof
Some quotes here endorse the approach rather than report first-hand use, or report a problem. We label those.
"Look at apps like Cal.com compared to Calendly and you'll see it's light years ahead and you can self-host with 1 click."
"I'm personally using Cal.com, it's free and I'm very happy."
Maintenance health
Can you do it today?
docker compose up -dGitHub
One-click deploy on Railway: https://cal.com/blog/partnership-with-railway-self-hosting-calcom
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