SHSelfHostIndex

Thunderbird Appointment vs OpenCalendar Sync

A side-by-side comparison of two self-hosted calendar & contacts options — licensing, setup difficulty, resource needs, and what each one replaces.

Not the right match-up?
TH Thunderbird Appointment Self-hostable scheduling tool for booking meetings VS OP OpenCalendar Sync Self-hosted shared calendar with public event pages
FeatureThunderbird AppointmentOpenCalendar Sync
CategoryCalendar & ContactsCalendar & Contacts
LicenseMPL-2.0MIT
LanguagePythonTypeScript
Setup difficultyMediumMedium
Min. RAM512 MB256 MB
Deploymentdocker, sourcedocker, source
GitHub stars★ 547★ 852
First released20232014
ReplacesCalendly, DoodleCalendly, Google Calendar

Why pick each one

Choose Thunderbird Appointment if…

  • Released under the MPL-2.0 license
  • First-class Docker support for quick deployment
  • Written in Python
  • Lightweight — runs in 512 MB RAM
Thunderbird Appointment details

Choose OpenCalendar Sync if…

  • Released under the MIT license
  • First-class Docker support for quick deployment
  • Written in TypeScript
  • Tiny footprint — runs in 256 MB RAM
OpenCalendar Sync details

Frequently asked questions

Is Thunderbird Appointment or OpenCalendar Sync better?

Neither is universally better. OpenCalendar Sync has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.

Are Thunderbird Appointment and OpenCalendar Sync free and open-source?

Yes. Thunderbird Appointment is licensed under MPL-2.0 and OpenCalendar Sync under MIT. Both can be self-hosted at no software cost.

Can I run Thunderbird Appointment and OpenCalendar Sync with Docker?

Thunderbird Appointment: yes. OpenCalendar Sync: yes.

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