Instead of Calendly
Booking pages that read your calendar.
Swap it
Cal.com is the uncommon case of an open-source product that is ahead of the commercial one on features, and it is one of the busiest projects in this file.
You lose: Nothing much. Some integrations are paid tiers.
Start here
Cal.com
Needs Postgres and a domain. Worth it.
github.com/calcom/cal.diycal.diy
A database, object storage or mail config, plus backups.
Also worth a look
- Easy!Appointments
Simple booking for a single business. Dated UI.
github.com/alextselegidis/easyappointmentseasyappointments.org
Facts checked 8 November 2026. Licences, activity and archive status come from each project's own repository; the verdict and the cost lines are the desk's.