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Networking · head to head

Eclipse Mosquitto vs Zigbee Alliance

Eclipse Mosquitto logo

Eclipse Mosquitto

Networking

Small, EPL-licensed MQTT broker that runs on hardware other brokers cannot

From
Free
Rated
-
Full reviewWebsite
Zigbee Alliance logo

Zigbee Alliance

Smart Home

Low-power wireless standard for IoT and smart home

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Eclipse Mosquitto there is no clustering: Mosquitto is a single process, so high availability means building your own failover and accepting session loss on switchover.; Zigbee Alliance the Internet Archive's capture of the Connectivity Standards Alliance's Zigbee page on 4 January 2024 confirmed Zigbee is a protocol standard rather than a purchased product, with the Alliance's revenue coming from member dues and per-device certification fees rather than a software price list.
  • They diverge on capability: Eclipse Mosquitto covers MQTT 5.0 support, Zigbee Alliance covers Low Power.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Eclipse Mosquitto and Zigbee Alliance actually diverge.

Attributes where Eclipse Mosquitto and Zigbee Alliance differ
AttributeEclipse MosquittoZigbee Alliance
Pricing modelOpen source, no licence feeopen-source
PlatformsLinux, Windows, macOS, DockerZigbee devices, Mesh networks, Smart home hubs, IoT platforms
CategoryNetworkingSmart Home
FoundedUnknown2002

Identical on both: starting price (Free), 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 Eclipse Mosquitto

  • MQTT 5.0 support
  • Very small footprint
  • Bridging
  • WebSockets listener
  • Command line clients
  • Dynamic security plugin

Only in Zigbee Alliance

  • Low Power
  • Mesh Networking
  • Self-Healing
  • Scalable
  • Smart home devices
  • Hubs
  • Controllers
  • Integration platforms

What people use each for

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

Eclipse Mosquitto

  • A home or building automation stack where the broker must run on the same small computer as everything elsenot Zigbee Alliance
  • An industrial gateway that buffers local telemetry and bridges selected topics to a cloud brokernot Zigbee Alliance
  • Local development and testing of MQTT clients without provisioning a cloud IoT servicenot Zigbee Alliance
  • An air-gapped deployment where a broker with no licence server and no phone-home behaviour is a requirementnot Zigbee Alliance

Zigbee Alliance

  • Smart lightingnot Eclipse Mosquitto
  • Sensor networksnot Eclipse Mosquitto
  • Home automationnot Eclipse Mosquitto
  • Industrial monitoringnot Eclipse Mosquitto

Where each one falls short

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

Eclipse Mosquitto

  • There is no clustering: Mosquitto is a single process, so high availability means building your own failover and accepting session loss on switchover.
  • Persistence is a local file rather than a replicated store, so a disk failure or an unclean shutdown can lose retained messages and queued QoS traffic.
  • Practical capacity is a few thousand concurrent clients on typical hardware, so a growing device fleet eventually forces a migration to a clustered broker.
  • The Eclipse Public Licence is weak copyleft rather than permissive, which some legal teams treat as a blocker when embedding the broker in a shipped commercial product.
  • There is no commercial support to buy from the project, so production incidents rely on community mailing lists or on paying a third party who happens to know the codebase.

Zigbee Alliance

  • The Internet Archive's capture of the Connectivity Standards Alliance's Zigbee page on 4 January 2024 confirmed Zigbee is a protocol standard rather than a purchased product, with the Alliance's revenue coming from member dues and per-device certification fees rather than a software price list.

Pricing, plan by plan

Eclipse Mosquitto

Free
  • Eclipse MosquittoFree
    • Eclipse Public License 2.0 with Eclipse Distribution Licence
    • MQTT 5.0, 3.1.1 and 3.1
    • No client or message limits beyond your hardware

Zigbee Alliance

Free
  • Open SpecificationFree
    • Low power mesh
    • Self-healing
    • Interoperable

Which should you pick?

Choose Eclipse Mosquitto if

  • You need mqtt 5.0 support.
  • You want to start without paying.
  • You work on Linux, Windows, macOS, Docker.
  • You also want very small footprint.
Eclipse Mosquitto review

Choose Zigbee Alliance if

  • You need low power.
  • You want to start without paying.
  • You work on Zigbee devices, Mesh networks, Smart home hubs, IoT platforms.
  • You also want mesh networking.
Zigbee Alliance review

Questions people ask

Is Eclipse Mosquitto or Zigbee Alliance better?
Neither clearly leads. Eclipse Mosquitto starts at Free and Zigbee Alliance at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Eclipse Mosquitto or Zigbee Alliance?
Eclipse Mosquitto starts at Free and Zigbee Alliance at Free.
Does Eclipse Mosquitto or Zigbee Alliance run on more platforms?
Eclipse Mosquitto runs on Linux, Windows, macOS, Docker. Zigbee Alliance runs on Zigbee devices, Mesh networks, Smart home hubs, IoT platforms.
Can I use Eclipse Mosquitto for free?
Both have a free tier, so you can try either at no cost before committing.
What is Eclipse Mosquitto best used for?
Eclipse Mosquitto is most often used for a home or building automation stack where the broker must run on the same small computer as everything else, an industrial gateway that buffers local telemetry and bridges selected topics to a cloud broker, local development and testing of mqtt clients without provisioning a cloud iot service, an air-gapped deployment where a broker with no licence server and no phone-home behaviour is a requirement. Of those, a home or building automation stack where the broker must run on the same small computer as everything else and an industrial gateway that buffers local telemetry and bridges selected topics to a cloud broker are not what Zigbee Alliance is typically brought in for.
What can Eclipse Mosquitto do that Zigbee Alliance cannot?
Eclipse Mosquitto covers MQTT 5.0 support, Very small footprint, Bridging, WebSockets listener. Zigbee Alliance covers Low Power, Mesh Networking, Self-Healing, Scalable.

Answered from the vendors’ own pages

Eclipse Mosquitto: Can Mosquitto be clustered?

No. It is a single process. High availability requires an external failover arrangement you build yourself.

Zigbee Alliance: Does the Connectivity Standards Alliance charge membership fees?

Membership information is not publicly disclosed on the main website. Prospective members must contact the organization directly or access the member login portal at community.csa-iot.org.

Source
Eclipse Mosquitto: What licence is it?

Eclipse Public License 2.0 alongside the Eclipse Distribution License, a weak copyleft rather than a permissive licence.

Zigbee Alliance: What are the costs for CSA certification or standards development?

Pricing for certification and standards development services is not posted online. Contact the CSA directly through their contact page for specific pricing.

Source
Eclipse Mosquitto: How many clients can it handle?

A few thousand concurrent connections on ordinary hardware; beyond that, use a clustered broker.

Zigbee Alliance: Is there a free tier or trial for CSA services?

The homepage does not disclose trial or free tier information. Contact the organization to learn about available options.

Source
Eclipse Mosquitto: Does it support MQTT 5?

Yes, along with 3.1.1 and 3.1.

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