Cal.diy
SchedulingScheduling infrastructure for absolutely everyone.
49k MIT Active
Replaces Calendly Scheduling
Open-source alternatives to Calendly
2 self-hostable options you can run on your own server, compared on facts from GitHub (fetched Oct 21, 2026).
Side-by-side comparison
| Tool |  Cal.diy |  Easy!Appointments |
|---|---|---|
| GitHub stars | 49,203 | 4,452 |
| License | MIT | GPL-3.0 |
| Last push | Oct 19, 2026 Active | Oct 19, 2026 Active |
| Forks | 15,399 | 1,581 |
| Open issues + PRs | 1,516 | 178 |
| Main language | TypeScript | PHP |
| Links | Repo · Website | Repo · Website |
Highlighted cells mark the highest star count and the most recent push. Source: GitHub REST API, per-tool links on each tool page. Copyleft licenses (AGPL/GPL) require sharing modifications if you distribute or (AGPL) serve them; check the repo license before deploying.
The options
Easy!Appointments
Scheduling:date: Easy!Appointments - Self Hosted Appointment Scheduler
4.5k GPL-3.0 Active
Replaces Calendly More in Scheduling
Rallly
SchedulingRallly is an open-source scheduling and collaboration tool designed to make organizing events and meetings easier.
5.3k AGPL-3.0 Active
Replaces Doodle