SHSelfHostIndex

OpnForm vs Tasks.org Server alt nono Calendarserver

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?
OP OpnForm Beautiful open-source form builder VS TA Tasks.org Server alt nono Calendarserver Standards-compliant calendar and scheduling server
FeatureOpnFormTasks.org Server alt nono Calendarserver
CategoryCalendar & ContactsCalendar & Contacts
LicenseAGPL-3.0Apache-2.0
LanguagePHPPython
Setup difficultyMediumHard
Min. RAM512 MB512 MB
Deploymentdockerbare-metal, source
GitHub stars★ 3,545★ 506
First released20262007
Replaces—Google Calendar, Exchange

Why pick each one

Choose OpnForm if…

  • Released under the AGPL-3.0 license
  • First-class Docker support for quick deployment
  • Active community (3.5k GitHub stars)
  • Written in PHP
OpnForm details

Choose Tasks.org Server alt nono Calendarserver if…

  • Released under the Apache-2.0 license
  • Written in Python
  • Lightweight — runs in 512 MB RAM
Tasks.org Server alt nono Calendarserver details

Frequently asked questions

Is OpnForm or Tasks.org Server alt nono Calendarserver better?

OpnForm is the stronger all-round pick: it has both the larger community and the simpler medium setup. Consider Tasks.org Server alt nono Calendarserver if its specific feature set fits your needs better.

Are OpnForm and Tasks.org Server alt nono Calendarserver free and open-source?

Yes. OpnForm is licensed under AGPL-3.0 and Tasks.org Server alt nono Calendarserver under Apache-2.0. Both can be self-hosted at no software cost.

Can I run OpnForm and Tasks.org Server alt nono Calendarserver with Docker?

OpnForm: yes. Tasks.org Server alt nono Calendarserver: check the project docs for container support.

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