4 self-hosted options
Open-source alternatives to Calendly
The best open-source alternative to Calendly is Cal.diy (MIT, 49,377 GitHub stars, Docker image). Rallly stands out for the most recent release (v4.16.2, October 2026), and Easy!Appointments stands out for the longest track record (since 2014).
About Calendly: A scheduling tool that lets people book meetings from your availability.
Updated · data from GitHub, refreshed daily
Top picks
- Rank 1:
Cal.diy
calcom/cal.diy
Online appointment scheduling system.
Active · last commit Oct 26, 2026
Booking & SchedulingTypeScriptDockerStands out for the most GitHub stars.
- Rank 2:
Rallly
lukevella/rallly
Create polls to vote on dates and times (alternative to Doodle).
Active · last commit Oct 25, 2026
Booking & SchedulingTypeScriptDockerStands out for the most recent release (v4.16.2, October 2026).
- Rank 3:
Easy!Appointments
alextselegidis/easyappointments
Allows your customers to book appointments with you via the web.
Active · last commit Oct 19, 2026
Booking & SchedulingPHPStands out for the longest track record (since 2014).
At a glance
Calendly alternatives compared
Open-source apps come first, then source-available ones and apps whose license appsgit could not verify; within each group, projects with at least 12 commits in the last 12 months come before less active or archived ones, then by GitHub stars.
| App | Stands out for | License | GitHub stars | Commits (12 mo) | Last commit | Docker image |
|---|---|---|---|---|---|---|
| Cal.diy | the most GitHub stars | MIT | 49,377 | 1,982 | Oct 26, 2026 | Yes |
| Rallly | the most recent release (v4.16.2, October 2026) | AGPL-3.0 | 5,322 | 1,714 | Oct 25, 2026 | Yes |
| Easy!Appointments | the longest track record (since 2014) | GPL-3.0 | 4,460 | 484 | Oct 19, 2026 | No |
| LibreBooking | a published Docker image | GPL-3.0 | 837 | 709 | Oct 25, 2026 | Yes |
Full list
All 4 Calendly alternatives
Open any app for live stats, license details and a deploy option.
- 1
Cal.diy
Online appointment scheduling system.
Booking & SchedulingDockerStands out for the most GitHub stars. Cal.diy has 49,377 GitHub stars, uses the MIT license, ships a Docker image and had 1,982 commits in the last year.
- 2
Rallly
Create polls to vote on dates and times (alternative to Doodle).
Booking & SchedulingDockerStands out for the most recent release (v4.16.2, October 2026). Rallly has 5,322 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 1,714 commits in the last year.
- 3
Easy!Appointments
Allows your customers to book appointments with you via the web.
Booking & SchedulingStands out for the longest track record (since 2014). Easy!Appointments has 4,460 GitHub stars, uses the GPL-3.0 license and had 484 commits in the last year.
- 4
LibreBooking
Resource scheduling solution offering a flexible, mobile-friendly, and extensible interface for organizations to manage resource reservations.
Booking & SchedulingDockerStands out for a published Docker image. LibreBooking has 837 GitHub stars, uses the GPL-3.0 license, ships a Docker image and had 709 commits in the last year.
Is there a free alternative to Calendly?
Yes. All 4 apps on this page are open source and free to self-host, so you can replace Calendly without per-user fees. You pay only for the server.
Can I self-host an alternative to Calendly with Docker?
Yes. 3 of the 4 apps here publish a Docker image, including Cal.diy, Rallly and LibreBooking, so you can run them on a home server or VPS with Docker Compose.
Which Calendly alternative is the most actively developed?
Cal.diy (MIT), with 1,982 commits in the last 12 months. Activity is a good sign that bugs and security issues get fixed.
How is this list ranked?
Open-source apps come first, then source-available ones and apps whose license appsgit could not verify; within each group, projects with at least 12 commits in the last 12 months come before less active or archived ones, then by GitHub stars.