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Databases · head to head

VerneMQ vs Vespa

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
Vespa logo

Vespa

Databases

Distributed AI search platform for retrieval, ranking, and inference

From
Free
Rated
-
Full reviewWebsite

The short version

  • 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.; Vespa pricing not publicly listed, requires contacting sales
  • They diverge on capability: VerneMQ covers Erlang/OTP clustering, Vespa covers Vector search.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which VerneMQ and Vespa actually diverge.

Attributes where VerneMQ and Vespa differ
AttributeVerneMQVespa
Pricing modelquotecontact-sales
PlatformsLinux, Docker, macOS, KubernetesCloud, Self-hosted
FoundedUnknown2023

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

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 Vespa

  • Vector search
  • Text and structured search
  • Machine-learned ranking
  • Real-time serving
  • SQL interface
  • Automatic scaling
  • Open-source

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 Vespa
  • A team building from source to stay strictly under Apache 2.0 terms with no vendor licence entanglementnot Vespa
  • A deployment needing custom authentication logic implemented as a plugin in Lua or over a webhooknot Vespa
  • An organisation that wants a broker maintained by a small European company rather than by a vendor that keeps changing licencesnot Vespa

Vespa

  • Build RAG systems with semantic search over documentsnot VerneMQ
  • Power e-commerce search with ML rankingnot VerneMQ
  • Create recommendation engines for personalizationnot VerneMQ
  • Implement real-time search for news or feedsnot VerneMQ
  • Deploy private semantic search over sensitive datanot 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.

Vespa

  • Pricing not publicly listed, requires contacting sales
  • Steeper learning curve compared to simpler search tools
  • Operational complexity for self-hosted deployments
  • Smaller ecosystem compared to cloud-native alternatives

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

Vespa

Free

No published plan breakdown. See the Vespa 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 Vespa if

  • You need vector search.
  • You want to start without paying.
  • You work on Cloud, Self-hosted.
  • You also want text and structured search.
Vespa review

Questions people ask

Is VerneMQ or Vespa better?
Neither clearly leads. VerneMQ starts at Free and Vespa at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, VerneMQ or Vespa?
VerneMQ starts at Free and Vespa at Free.
Does VerneMQ or Vespa run on more platforms?
VerneMQ runs on Linux, Docker, macOS, Kubernetes. Vespa runs on Cloud, Self-hosted.
Can I use VerneMQ for free?
Both have a free tier, so you can try either at no cost before committing.
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 Vespa is typically brought in for.
What can VerneMQ do that Vespa cannot?
VerneMQ covers Erlang/OTP clustering, MQTT 5.0 support, Plugin system, Backpressure handling. Vespa covers Vector search, Text and structured search, Machine-learned ranking, Real-time serving.

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.

Vespa: Is Vespa open-source?

Yes, Vespa is open-source under the Apache 2.0 license. The code is available on GitHub, and you can self-host or use the managed cloud service.

Source
VerneMQ: Is the project still maintained?

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

Vespa: What latency can Vespa achieve?

Vespa is designed for sub-100 millisecond latencies with thousands of queries per second, suitable for real-time search and recommendation applications.

Source
VerneMQ: Does it have a managed cloud?

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

Vespa: Does Vespa support vector search?

Yes, Vespa provides native vector search capabilities alongside text, structured data, and tensor operations for building comprehensive search and AI applications.

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.

Vespa: What is the pricing model for Vespa Cloud?

Vespa Cloud pricing is not publicly listed and requires contacting their sales team to discuss your specific use case and scale requirements.

Source
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