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Databases · head to head

VerneMQ vs Wattwatchers EMS

VerneMQ logo

VerneMQ

Databases

Erlang MQTT broker whose source is Apache 2.0 but whose official binaries need a paid subscription

From
Free
Rated
-
Full reviewWebsite
Wattwatchers EMS logo

Wattwatchers EMS

Energy

Smart building energy management system

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only VerneMQ has a free tier, so it costs nothing to try first.
  • Each has a real cost: VerneMQ the official binaries and Docker images are not Apache 2.0 but sit under a EULA requiring a yearly commercial subscription, a distinction easy to miss and awkward to discover during a licence audit.; Wattwatchers EMS requires hardware installation at each monitoring point, increasing total cost of ownership
  • They diverge on capability: VerneMQ covers Erlang/OTP clustering, Wattwatchers EMS covers Real-time monitoring.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which VerneMQ and Wattwatchers EMS actually diverge.

Attributes where VerneMQ and Wattwatchers EMS differ
AttributeVerneMQWattwatchers EMS
Starting priceFreeOn request
Pricing modelquoteUnknown
Free tierYesNo
PlatformsLinux, Docker, macOS, KubernetesWeb, iOS, Android, Cloud
CategoryDatabasesEnergy
FoundedUnknown2007

Identical on both: 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 VerneMQ

  • Erlang/OTP clustering
  • MQTT 5.0 support
  • Plugin system
  • Backpressure handling
  • Bridge support
  • Metrics export
  • MQTT over WebSockets
  • Pluggable auth backends

Only in Wattwatchers EMS

  • Real-time monitoring
  • Energy analytics
  • Smart recommendations
  • Alert system
  • Mobile app
  • Home Assistant
  • Google Home
  • SSL encryption

What people use each for

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

VerneMQ

  • An industrial operator that wants an MQTT broker with predictable memory behaviour and no data integration features it will not usenot Wattwatchers EMS
  • A team building from source to stay strictly under Apache 2.0 terms with no vendor licence entanglementnot Wattwatchers EMS
  • A deployment needing custom authentication logic implemented as a plugin in Lua or over a webhooknot Wattwatchers EMS
  • An organisation that wants a broker maintained by a small European company rather than by a vendor that keeps changing licencesnot Wattwatchers EMS

Wattwatchers EMS

  • Energy optimizationnot VerneMQ
  • Cost reductionnot VerneMQ

Where each one falls short

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

VerneMQ

  • The official binaries and Docker images are not Apache 2.0 but sit under a EULA requiring a yearly commercial subscription, a distinction easy to miss and awkward to discover during a licence audit.
  • Octavo Labs is a very small company, so support depth, response times and the bus factor on the codebase are materially thinner than at HiveMQ or EMQ.
  • There is no data integration or rule engine layer, so routing messages into a database means writing and operating your own consumer service.
  • Operating an Erlang cluster requires runtime knowledge that most teams do not have and will use for nothing else in their stack.
  • There is no vendor-managed cloud offering, so every deployment is self-operated with the infrastructure and on-call cost that implies.

Wattwatchers EMS

  • Requires hardware installation at each monitoring point, increasing total cost of ownership
  • Built for small to medium portfolios; scaling to large portfolios may present usability challenges
  • Limited to energy monitoring; not a comprehensive building management system

Pricing, plan by plan

VerneMQ

Free
  • Source buildFree
    • Apache 2.0 licensed source from GitHub
    • Full clustering and plugin capability
    • You compile and package it yourself
  • Binary packages and Docker images$undefined/year
    • Covered by the VerneMQ EULA, not Apache 2.0
    • Yearly usage subscription expected for commercial use
    • Official builds and Docker images
  • Commercial support$undefined/year
    • Evaluation, customisation and operations assistance
    • Custom development
    • Long-term maintenance agreements

Wattwatchers EMS

On request

No published plan breakdown. See the Wattwatchers EMS review.

Which should you pick?

Choose VerneMQ if

  • You need erlang/otp clustering.
  • You want to start without paying.
  • You work on Linux, Docker, macOS, Kubernetes.
  • You also want mqtt 5.0 support.
VerneMQ review

Choose Wattwatchers EMS if

  • You need real-time monitoring.
  • You work on Web, iOS, Android, Cloud.
  • You also want energy analytics.
Wattwatchers EMS review

Questions people ask

Is VerneMQ or Wattwatchers EMS better?
Neither clearly leads. VerneMQ starts at Free and Wattwatchers EMS at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, VerneMQ or Wattwatchers EMS?
VerneMQ has a free tier; the other does not. Paid plans start at Free for VerneMQ and On request for Wattwatchers EMS.
Does VerneMQ or Wattwatchers EMS run on more platforms?
VerneMQ runs on Linux, Docker, macOS, Kubernetes. Wattwatchers EMS runs on Web, iOS, Android, Cloud.
Can I use VerneMQ for free?
Yes. VerneMQ has a free tier, so you can try it without paying. Wattwatchers EMS starts at On request.
What is VerneMQ best used for?
VerneMQ is most often used for an industrial operator that wants an mqtt broker with predictable memory behaviour and no data integration features it will not use, a team building from source to stay strictly under apache 2.0 terms with no vendor licence entanglement, a deployment needing custom authentication logic implemented as a plugin in lua or over a webhook, an organisation that wants a broker maintained by a small european company rather than by a vendor that keeps changing licences. Of those, an industrial operator that wants an mqtt broker with predictable memory behaviour and no data integration features it will not use and a team building from source to stay strictly under apache 2.0 terms with no vendor licence entanglement are not what Wattwatchers EMS is typically brought in for.
What can VerneMQ do that Wattwatchers EMS cannot?
VerneMQ covers Erlang/OTP clustering, MQTT 5.0 support, Plugin system, Backpressure handling. Wattwatchers EMS covers Real-time monitoring, Energy analytics, Smart recommendations, Alert system.

Answered from the vendors’ own pages

VerneMQ: Is VerneMQ free?

The source is Apache 2.0 and free. The official binary packages and Docker images are covered by a separate EULA that expects a yearly fee for commercial use.

Wattwatchers EMS: What data does Wattwatchers monitor?

Wattwatchers measures consumption at the device or circuit level in real-time, identifies equipment inefficiencies, and streams data through cloud dashboards for detailed energy consumption pattern analysis.

Source
VerneMQ: Is the project still maintained?

Yes. Octavo Labs AG in Zurich continues to publish 2.x releases, most recently in 2026.

Wattwatchers EMS: What web-based tools does Wattwatchers provide?

Wattwatchers provides Fleet Management for fleet overview and device health, an Onboarding tool for smartphone-based device configuration, and a Dashboard for customers to view sites and data.

Source
VerneMQ: Does it have a managed cloud?

No. Every deployment is self-hosted, with commercial support available from Octavo Labs.

Wattwatchers EMS: What is the mydata.energy app?

mydata.energy is Wattwatchers' mobile application available on iPhone and Android that provides real-time energy management and monitoring for homes and small businesses.

Source
VerneMQ: How does it compare to EMQX?

Narrower in features and without a rule engine, but with a simpler licence story for source builds after EMQX moved to BSL.

Wattwatchers EMS: How does ADEPT help with energy management?

ADEPT is Wattwatchers' agile development platform for distributed energy that enables fleet analytics, real-time performance analysis, and zero-code prototyping of custom analytics rules.

Source
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