Free, open-source alternatives to SmartThings
Samsung's smart home platform. 6 apps you can run yourself instead of SmartThings, sorted by how well they replace it. Each one is open source, so your data stays with you.
openHAB
Vendor and technology agnostic open source software for home automation.
Domoticz
Home Automation System that lets you monitor and configure various devices like: Lights, Switches, various sensors/meters like Temperature, Rain, Wind, UV, Electra, Gas, Water and much more.
ioBroker
Integration platform for the Internet of Things, focused on building automation, smart metering, ambient assisted living, process automation, visualization and data logging.
Gladys
Privacy-first home assistant.
FHEM
Automate common tasks in the household like switching lamps and heating. It can also be used to log events like temperature or power consumption. You can control it via web or smartphone frontends, telnet or TCP/IP directly.
Side by side
Why replace SmartThings?
SmartThings works, but your data lives in someone else's account, the price can change at any time, and features can disappear. An open-source app you run yourself is yours: you choose where it runs, who can see the data, and when to update.
Questions
What is the best free alternative to SmartThings?
Home Assistant is the closest open-source replacement for SmartThings in our list. openHAB and Domoticz are worth a look too, depending on what you need.
Can I self-host an alternative to SmartThings?
Yes. All 6 apps on this page are open source and can run on your own server, usually with Docker, or on a managed host that installs them for you.