FHEM vs Home Assistant
A side-by-side comparison of two self-hosted home automation options — licensing, setup difficulty, resource needs, and what each one replaces.
FHEM
Perl-based server for home automation tasks
VS
Home Assistant
Open-source home automation that puts privacy first
| Feature | FHEM | Home Assistant |
|---|---|---|
| Deploy effort | Under-an-hour setup | ≈5-minute setup |
| Health score | 62 · Good | 100 · Excellent |
| Category | Home Automation | Home Automation |
| License | GPL-2.0 | Apache-2.0 |
| Language | Perl | Python |
| Setup difficulty | Hard | Medium |
| Min. RAM | 256 MB | 1,024 MB |
| Deployment | docker, bare-metal | docker, bare-metal, one-click |
| GitHub stars | ★ 22 | ★ 91,123 |
| First released | 2005 | 2013 |
| Replaces | SmartThings | SmartThings, Google Home |
What are FHEM and Home Assistant?
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
Home Assistant is an open-source home automation platform that integrates thousands of smart devices and runs automations locally. It targets anyone wanting private, vendor-neutral smart home control. It is deployed as an OS image, Docker, or supervised install.
- Integrates thousands of devices
- Local-first automations
- Add-on ecosystem
- Powerful dashboards
FHEM vs Home Assistant: key differences
FHEM is written in Perl, while Home Assistant is built with Python. Licensing differs — GPL-2.0 for FHEM versus Apache-2.0 for Home Assistant. FHEM is the lighter option, starting around 256 MB of RAM against 1,024 MB for Home Assistant. FHEM is the more established project (first released 2005), while Home Assistant arrived in 2013. Home Assistant has the considerably larger community, at 91,123 GitHub stars versus 22.
Why pick each one
Choose FHEM if…
- Extremely mature
- Runs on modest hardware
Watch out for
- Dated, technical interface
- Configuration is arcane
Choose Home Assistant if…
- Huge device support
- Local control and privacy
- Very active community
Watch out for
- Learning curve for automations
- Occasional breaking updates
Frequently asked questions
Is FHEM or Home Assistant better?
Home Assistant is the stronger all-round pick: it has both the larger community and the simpler medium setup. Consider FHEM if its specific feature set fits your needs better.
Are FHEM and Home Assistant free and open-source?
Yes. FHEM is licensed under GPL-2.0 and Home Assistant under Apache-2.0. Both can be self-hosted at no software cost.
Can I run FHEM and Home Assistant with Docker?
FHEM: yes. Home Assistant: yes.
Which is lighter on resources, FHEM or Home Assistant?
FHEM has the smaller minimum footprint at 256 MB of RAM, compared to about 1,024 MB for Home Assistant. Real-world usage depends on library size, user count, and enabled features.