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MQTT vs OpenHAB

MQTT logo

MQTT

Smart Home

Lightweight messaging protocol for IoT devices

From
Free
Rated
-
Full reviewWebsite
OpenHAB logo

OpenHAB

Smart Home

Open source automation software for your home

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: MQTT mQTT is an open-source protocol standard with no commercial pricing; not a commercial product; OpenHAB requires a 64-bit Java 21 JVM to be installed and maintained separately
  • They diverge on capability: MQTT covers Publish-Subscribe, OpenHAB covers Vendor Agnostic.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which MQTT and OpenHAB actually diverge.

Attributes where MQTT and OpenHAB differ
AttributeMQTTOpenHAB
PlatformsAny platform, Embedded devices, Cloud, Edge computingLinux, Windows, MacOS, Docker, Raspberry Pi
Founded19992010

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

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 MQTT

  • Publish-Subscribe
  • Lightweight
  • QoS Levels
  • Retained Messages
  • IoT platforms
  • Home automation
  • Cloud services
  • Edge devices

Only in OpenHAB

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

What people use each for

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

MQTT

  • IoT messagingnot OpenHAB
  • Sensor datanot OpenHAB
  • Real-time updatesnot OpenHAB
  • Device telemetrynot OpenHAB

OpenHAB

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

Where each one falls short

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

MQTT

  • MQTT is an open-source protocol standard with no commercial pricing; not a commercial product

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

MQTT

Free
  • Open ProtocolFree
    • Publish-subscribe
    • Lightweight
    • QoS levels

OpenHAB

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

Which should you pick?

Choose MQTT if

  • You need publish-subscribe.
  • You want to start without paying.
  • You work on Any platform, Embedded devices, Cloud, Edge computing.
  • You also want lightweight.
MQTT 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 MQTT or OpenHAB better?
Neither clearly leads. MQTT 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, MQTT or OpenHAB?
MQTT starts at Free and OpenHAB at Free.
Does MQTT or OpenHAB run on more platforms?
MQTT runs on Any platform, Embedded devices, Cloud, Edge computing. OpenHAB runs on Linux, Windows, MacOS, Docker, Raspberry Pi.
Can I use MQTT for free?
Both have a free tier, so you can try either at no cost before committing.
What is MQTT best used for?
MQTT is most often used for iot messaging, sensor data, real-time updates, device telemetry. Of those, iot messaging and sensor data are not what OpenHAB is typically brought in for.
What can MQTT do that OpenHAB cannot?
MQTT covers Publish-Subscribe, Lightweight, QoS Levels, Retained Messages. OpenHAB covers Vendor Agnostic, Rule Engine, 200+ Bindings, Local Processing.

Answered from the vendors’ own pages

MQTT: Does MQTT have a commercial license cost?

MQTT is an open-source communication protocol and standard. No pricing is published because MQTT itself is not a commercial product for sale.

Source
OpenHAB: How much does openHAB cost?

openHAB is 100% open source and completely free to download, install, and use across all supported platforms.

Source
OpenHAB: Are there any subscription fees for openHAB?

No, openHAB has no subscription fees. The software is free and released under an open source license for unlimited use.

Source
OpenHAB: How can I support openHAB?

While openHAB is free to use, the project accepts voluntary donations through the openHAB Foundation to support development and maintenance.

Source
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