SHSelfHostIndex

Thunderbird Appointment vs OpenSlides

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 OpenSlides Presentation and assembly system for managing and projecting agenda,
FeatureThunderbird AppointmentOpenSlides
CategoryCalendar & ContactsCalendar & Contacts
LicenseMPL-2.0MIT
LanguagePythonShell
Setup difficultyMediumMedium
Min. RAM512 MB512 MB
Deploymentdocker, sourcedocker
GitHub stars★ 547★ 629
First released20232026
ReplacesCalendly, Doodle—

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 OpenSlides if…

  • Released under the MIT license
  • First-class Docker support for quick deployment
  • Written in Shell
  • Lightweight — runs in 512 MB RAM
OpenSlides details

Frequently asked questions

Is Thunderbird Appointment or OpenSlides better?

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

Are Thunderbird Appointment and OpenSlides free and open-source?

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

Can I run Thunderbird Appointment and OpenSlides with Docker?

Thunderbird Appointment: yes. OpenSlides: yes.

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