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FHEM vs Home Assistant Operating System

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

Not the right match-up?
FHEM Perl-based server for home automation tasks VS HO Home Assistant Operating System Embedded operating system optimized for Home Assistant
FeatureFHEMHome Assistant Operating System
Deploy effortUnder-an-hour setup≈5-minute setup
Health score62 · Good91 · Excellent
CategoryHome AutomationHome Automation
LicenseGPL-2.0Apache-2.0
LanguagePerlPython
Setup difficultyHardEasy
Min. RAM256 MB1,024 MB
Deploymentdocker, bare-metalone-click, bare-metal
GitHub stars★ 22★ 7,492
First released20052019
ReplacesSmartThingsSmartThings, Hubitat

What are FHEM and Home Assistant Operating System?

FHEM

FHEM is a long-standing, GPL-licensed server for home automation used to control lights, heating, alarms, and many other devices. It supports a vast range of protocols through community modules.

  • Vast protocol support
  • Community module library
  • Lightweight Perl server
  • Long-term reliability

Home Assistant Operating System

Home Assistant Operating System is a minimal embedded OS designed to run the Home Assistant smart home platform with add-on support. It manages updates and add-ons through the Supervisor.

  • Purpose-built OS for HA
  • Add-on store via Supervisor
  • Automatic updates
  • Runs on Pi and x86

Read the full Home Assistant Operating System guide →

FHEM vs Home Assistant Operating System: key differences

FHEM is written in Perl, while Home Assistant Operating System is built with Python. Licensing differs — GPL-2.0 for FHEM versus Apache-2.0 for Home Assistant Operating System. FHEM is the lighter option, starting around 256 MB of RAM against 1,024 MB for Home Assistant Operating System. FHEM is the more established project (first released 2005), while Home Assistant Operating System arrived in 2019. Home Assistant Operating System has the considerably larger community, at 7,492 GitHub stars versus 22. FHEM lists first-class Docker deployment; Home Assistant Operating System does not.

Why pick each one

Choose FHEM if…

  • Extremely mature
  • Runs on modest hardware

Watch out for

  • Dated, technical interface
  • Configuration is arcane
FHEM details

Choose Home Assistant Operating System if…

  • Easiest full-featured HA install
  • Managed add-ons

Watch out for

  • Takes over the whole device
  • Less general-purpose
Home Assistant Operating System details

Frequently asked questions

Is FHEM or Home Assistant Operating System better?

Home Assistant Operating System is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider FHEM if its specific feature set fits your needs better.

Are FHEM and Home Assistant Operating System free and open-source?

Yes. FHEM is licensed under GPL-2.0 and Home Assistant Operating System under Apache-2.0. Both can be self-hosted at no software cost.

Can I run FHEM and Home Assistant Operating System with Docker?

FHEM: yes. Home Assistant Operating System: check the project docs for container support.

Which is lighter on resources, FHEM or Home Assistant Operating System?

FHEM has the smaller minimum footprint at 256 MB of RAM, compared to about 1,024 MB for Home Assistant Operating System. Real-world usage depends on library size, user count, and enabled features.

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