Top pick · highest health
Rallly
Create polls to vote on dates and times (alternative to Doodle).
DockerNodejs
Booking and Scheduling
Open source alternatives to Calendly
We track 6 open-source Calendly alternatives, of which 6 currently score 70 or above on Repoly's GitHub health scale and 3 ship a Docker image. Rallly leads on health at 95/100 with 753 commits in the last 90 days; across all 6 projects you are choosing between AGPL-3.0, GPL-3.0, MIT.
updated Oct 2026 6 alternatives best health 95 ★ 62k combined 1,432 commits / 90d 3 with Docker
Top picks to replace Calendly
Showing 6 of 6 tools
All 6 Calendly alternatives, ranked by health
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LibreBooking
Resource scheduling solution offering a flexible, mobile-friendly, and extensible interface for organizations to manage resource reservations.
DockerPHP -
Seatsurfing
Webbased app to book seats, desks and rooms for offices.
Docker -
Easy!Appointments
Allows your customers to book appointments with you via the web.
PHP -
Alf.io
Ticket reservation system.
Java -
Cal.diy
Online appointment scheduling system.
Nodejs
Calendly alternatives compared
Rallly edges LibreBooking 95 to 92, and most of the difference is stars: 5.3k stars against 840 stars. Cal.diy has the largest following at 50k stars, yet ranks #6 of 6, held back mostly by Docker support (no Docker image).
The most recent release is Seatsurfing v1.139.0, published today. None of the measured options scores under 40. By stack, Nodejs (2), PHP (2) and Java (1) are the most common. Cal.diy is permissively licensed; Rallly, LibreBooking, Seatsurfing and 2 more are copyleft.
| Tool | Health | Stars | Licence | Last commit | Docker |
|---|---|---|---|---|---|
| Rallly Steady at 95 since 11 Sep | 95 | 5.3k | AGPL-3.0 | today | Yes |
| LibreBooking Steady at 92 since 11 Sep | 92 | 840 | GPL-3.0 | 2 days ago | Yes |
| Seatsurfing Steady at 90 since 11 Sep | 90 | 316 | GPL-3.0 | today | Yes |
| Easy!Appointments Up 28 points since 11 Sep | 85 | 4.5k | GPL-3.0 | 4 days ago | No |
| Alf.io Up 27 points since 11 Sep | 83 | 1.6k | GPL-3.0 | yesterday | No |
| Cal.diy | 81 | 50k | MIT | yesterday | No |
Calendly alternatives: common questions
What is the most maintained open source alternative to Calendly?
Rallly scores highest at 95/100, with 753 commits in the last 90 days, 5.3k stars on GitHub and its latest release (v4.16.3) published 4 days ago. It is also the most active by raw commit count.
Which Calendly alternatives use a permissive licence?
1 of 6 are permissively licensed (MIT, Apache, BSD or similar): Cal.diy (MIT). 5 use copyleft licences such as GPL or AGPL, which require you to publish changes if you distribute a modified version.
Which Calendly alternatives run in Docker?
3 of 6 publish a Docker image or Compose file: Rallly, LibreBooking, Seatsurfing. Docker support contributes 10 of the 100 available health points, because it is the clearest signal that self-hosting is a supported path rather than an afterthought.
Is Rallly or LibreBooking the better Calendly alternative?
On measured health Rallly leads, 95 to 92. Rallly has 753 commits in 90 days, 5.3k stars and v4.16.3 from 4 days ago; LibreBooking has 134 commits in 90 days, 840 stars and v7.1.0 from 17 days ago. Rallly is ahead or level on every term Repoly measures.
Are the Calendly alternatives still maintained?
6 of the 6 measured options score 70 or above. Every measured option had commits in the last 90 days. None scores under 40.
What languages are the Calendly alternatives written in?
Nodejs: Rallly and Cal.diy. PHP: LibreBooking and Easy!Appointments. Java: Alf.io. The stack matters if you plan to extend or patch the tool yourself.
