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Networking · head to head

Consul vs Eclipse Mosquitto

Consul logo

Consul

Networking

Service discovery, networking, and security

From
Free
Rated
-
Full reviewWebsite
Eclipse Mosquitto logo

Eclipse Mosquitto

Networking

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

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Consul namespaces, admin partitions and other multi tenancy controls are Consul Enterprise only; 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.
  • They diverge on capability: Consul covers Service discovery, Eclipse Mosquitto covers MQTT 5.0 support.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Consul and Eclipse Mosquitto actually diverge.

Attributes where Consul and Eclipse Mosquitto differ
AttributeConsulEclipse Mosquitto
Pricing modelopen-sourceOpen source, no licence fee
PlatformsLinux, Windows, Mac, CloudLinux, Windows, macOS, Docker
Founded2014Unknown

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Networking).

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 Consul

  • Service discovery
  • Health checking
  • Key/value store
  • Multi-datacenter
  • DNS interface
  • Service mesh
  • Load balancing
  • Configuration management

Only in Eclipse Mosquitto

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

What people use each for

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

Consul

  • Service discovery and health checking across dynamic infrastructurenot Eclipse Mosquitto
  • Running a service mesh with mutual TLS between servicesnot Eclipse Mosquitto
  • Distributed key value configuration storage for applicationsnot Eclipse Mosquitto

Eclipse Mosquitto

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

Where each one falls short

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

Consul

  • Namespaces, admin partitions and other multi tenancy controls are Consul Enterprise only
  • Audit logging, OIDC authentication and FIPS 140-2 builds require Consul Enterprise, so compliance driven deployments cannot use the free edition
  • Automated backups, redundancy zones, read replicas and automated server upgrades are Enterprise only
  • Long Term Support releases are Enterprise only, so community users must upgrade to stay supported
  • Service mesh and advanced traffic management sit in the Premium Enterprise tier above Standard Enterprise
  • HashiCorp does not publish a Consul rate on its pricing page, which lists per resource prices for Terraform instead

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.

Pricing, plan by plan

Consul

Free
  • Open SourceFree
    • Service discovery
    • Health checking
    • KV store

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

Which should you pick?

Choose Consul if

  • You need service discovery.
  • You want to start without paying.
  • You work on Linux, Windows, Mac, Cloud.
  • You also want health checking.
Consul review

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

Questions people ask

Is Consul or Eclipse Mosquitto better?
Neither clearly leads. Consul starts at Free and Eclipse Mosquitto at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Consul or Eclipse Mosquitto?
Consul starts at Free and Eclipse Mosquitto at Free.
Does Consul or Eclipse Mosquitto run on more platforms?
Consul runs on Linux, Windows, Mac, Cloud. Eclipse Mosquitto runs on Linux, Windows, macOS, Docker.
Can I use Consul for free?
Both have a free tier, so you can try either at no cost before committing.
What is Consul best used for?
Consul is most often used for service discovery and health checking across dynamic infrastructure, running a service mesh with mutual tls between services, distributed key value configuration storage for applications. Of those, service discovery and health checking across dynamic infrastructure and running a service mesh with mutual tls between services are not what Eclipse Mosquitto is typically brought in for.
What can Consul do that Eclipse Mosquitto cannot?
Consul covers Service discovery, Health checking, Key/value store, Multi-datacenter. Eclipse Mosquitto covers MQTT 5.0 support, Very small footprint, Bridging, WebSockets listener.

Answered from the vendors’ own pages

Consul: How much does Consul cost?

Consul does not publish specific pricing. The open source Community edition is free. HashiCorp also offers a Consul Enterprise edition, but pricing details are not disclosed publicly and must be obtained by contacting HashiCorp sales.

Source
Eclipse Mosquitto: Can Mosquitto be clustered?

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

Consul: Is Consul open source?

Consul includes a free, open source Community edition. HashiCorp also offers a proprietary Enterprise edition for organizations requiring advanced features, but no public pricing is available for the Enterprise version.

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.

Eclipse Mosquitto: How many clients can it handle?

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

Eclipse Mosquitto: Does it support MQTT 5?

Yes, along with 3.1.1 and 3.1.

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