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IoT & Smart Home · head to head

ESPHome vs OpenHAB

ESPHome logo

ESPHome

IoT & Smart Home

Custom firmware for ESP8266/ESP32 smart home devices

From
Free
Rated
-
Full reviewWebsite
OpenHAB logo

OpenHAB

IoT & Smart Home

Open source automation software for your home

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: ESPHome eSPHome runs only on supported microcontrollers; the project recommends ESP32, ESP32-S3, ESP32-C3 and ESP32-C6 and advises against ESP8266 for new projects; OpenHAB requires a 64-bit Java 21 JVM to be installed and maintained separately
  • They diverge on capability: ESPHome covers YAML Configuration, OpenHAB covers Vendor Agnostic.

Where they differ

Only the attributes on which ESPHome and OpenHAB actually diverge.

Attributes where ESPHome and OpenHAB differ
AttributeESPHomeOpenHAB
PlatformsESP8266, ESP32, Docker, Raspberry PiLinux, Windows, MacOS, Docker, Raspberry Pi
CategoryIoT & Smart HomeUnknown
Founded20182010

Identical on both: starting price (Free), pricing model (open-source), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in ESPHome

  • YAML Configuration
  • OTA Updates
  • Home Assistant Native
  • Custom Components
  • Home Assistant
  • API
  • Native integration
  • ESP8266 support

Only in OpenHAB

  • Vendor Agnostic
  • Rule Engine
  • 200+ Bindings
  • Local Processing
  • Z-Wave
  • Zigbee
  • REST API
  • Linux support

Both cover

  • MQTT
  • Docker support
  • Raspberry Pi support

What people use each for

The jobs each tool is most often brought in to do.

ESPHome

  • Building custom smart home sensors and switches on ESP32 hardwarenot OpenHAB
  • Replacing vendor cloud firmware on ESP based devices with locally controlled firmwarenot OpenHAB
  • Integrating DIY devices into Home Assistant over a native API or MQTTnot OpenHAB

OpenHAB

  • Self-hosted vendor neutral home automation hubnot ESPHome
  • Bridging smart home devices from different manufacturers under one set of rulesnot ESPHome

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

ESPHome

  • ESPHome runs only on supported microcontrollers; the project recommends ESP32, ESP32-S3, ESP32-C3 and ESP32-C6 and advises against ESP8266 for new projects
  • Support for ESP32-H2, RP2040 and other newer chips is documented as less mature
  • Large displays and some sensors do not work well on ESP8266 because of its limited RAM, which is roughly a fifth of an ESP32

OpenHAB

  • Requires a 64-bit Java 21 JVM to be installed and maintained separately
  • Oracle Java is explicitly not recommended by the project because of potential licensing restrictions
  • The recommended hardware is a dedicated Raspberry Pi 4 or newer rather than shared hardware
  • Some version upgrades require additional manual steps run through a separate upgrade tool

Pricing, plan by plan

ESPHome

Free
  • CommunityFree
    • Full firmware
    • Home Assistant integration
    • Custom sensors

OpenHAB

Free
  • Community EditionFree
    • Unlimited devices
    • 200+ bindings
    • Local control

Which should you pick?

Choose ESPHome if

  • You need yaml configuration.
  • You want to start without paying.
  • You work on ESP8266, ESP32, Docker, Raspberry Pi.
  • You also want ota updates.
ESPHome review

Choose OpenHAB if

  • You need vendor agnostic.
  • You want to start without paying.
  • You work on Linux, Windows, MacOS, Docker, Raspberry Pi.
  • You also want rule engine.
OpenHAB review

Questions people ask

Is ESPHome or OpenHAB better?
Neither clearly leads. ESPHome starts at Free and OpenHAB at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ESPHome or OpenHAB?
ESPHome starts at Free and OpenHAB at Free.
Does ESPHome or OpenHAB run on more platforms?
ESPHome runs on ESP8266, ESP32, Docker, Raspberry Pi. OpenHAB runs on Linux, Windows, MacOS, Docker, Raspberry Pi.
Can I use ESPHome for free?
Both have a free tier, so you can try either at no cost before committing.
What is ESPHome best used for?
ESPHome is most often used for building custom smart home sensors and switches on esp32 hardware, replacing vendor cloud firmware on esp based devices with locally controlled firmware, integrating diy devices into home assistant over a native api or mqtt. Of those, building custom smart home sensors and switches on esp32 hardware and replacing vendor cloud firmware on esp based devices with locally controlled firmware are not what OpenHAB is typically brought in for.
What can ESPHome do that OpenHAB cannot?
ESPHome covers YAML Configuration, OTA Updates, Home Assistant Native, Custom Components. OpenHAB covers Vendor Agnostic, Rule Engine, 200+ Bindings, Local Processing. Both handle MQTT, Docker support, Raspberry Pi support.
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