Cal.com vs Someday

Comparing two open source alternatives to Calendly. Use the comparison below to decide which one fits your needs.

Cal.com

AGPL-3.0

Open-source scheduling infrastructure — a self-hostable alternative to Calendly for booking meetings and appointments.

MIT

Free, self-hostable meeting scheduler built on Google Apps Script — a Cal.com and Calendly alternative for Gmail users.

	Cal.com	Someday
License	AGPL-3.0	MIT
Self-hostable	Yes	Yes
GitHub Stars	48,943	1,065
Forks	15,310	59
Open Issues	1,500	5
Last Commit	Sep 26, 2026	Jul 20, 2026
First Released	Mar 22, 2021	Nov 1, 2024
Categories	Collaboration & Communication Tools	Marketing Automation Time & Task Management Tools
Tags	#project management #scheduler	—

Cal.com48,943

Someday

A fast, self-hostable scheduling platform written in Rust, like Cal.com but without Node.js or a database server.

Open source Calendly alternative that runs on Cloudflare’s free tier with Google Calendar and Outlook sync.