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Head-to-head · Message Broker Software

Solace PubSub+ Event Broker vs Apache Kafka

  • Updated Nov 2026
  • Both researched from official sources
  • 1 check side by side
Higher score Solace PubSub+ Event Broker #2 in Message Broker Software 9.2/10 Free plan · 30-day trial Free planFree trial✓ 0 of 1 features Visit Solace
Apache Kafka #4 in Message Broker Software 9.0/10 Open source ✓ 0 of 1 features Visit Apache Kafka

Solace PubSub+ Event Broker leads on 0 checks, Apache Kafka on 0, and 1 is even. Who comes out ahead on the 1 yes/no, price and count check where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreSolace PubSub+ Event Broker · 9.2/10
  • Free planonly Solace PubSub+ Event Broker
  • Free trialonly Solace PubSub+ Event Broker

Solace PubSub+ Event Broker scores higher on our rubric for message broker software: 9.2 against 9.0 out of 10; our editors rank them #2 and #4.

Solace PubSub+ Event Broker is the better fit for hybrid event mesh deployments. Apache Kafka is the better fit for event streaming and stream processing.

  • Solace PubSub+ Event Broker fits best

    Hybrid event mesh deployments

  • Apache Kafka fits best

    Event streaming and stream processing

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Side by side

Feature Solace PubSub+ Event Broker 9.2/10 Visit ↗ Apache Kafka 9.0/10 Visit ↗
At a glance
Editor score 9.2 9.0
Ranking #2 in Message Broker Software #4 in Message Broker Software
Best for Hybrid event mesh deployments Event streaming and stream processing
Pricing model Free plan + paid Free
Starting price Free plan · 30-day trial Open source
Free plan ✓ (best) Not checked yet
Free trial 30 days —
Deployment Cloud, Self-hosted Self-hosted
Support Email, Phone, Tickets, Community · 24/7 Community, Docs
Integrations 6 integrations 6 integrations
Built for Mid-market, Enterprise Mid-market, Enterprise
Features Solace PubSub+ Event Broker 0/1 · Apache Kafka 0/1
Dead-letter queues Not checked yet Not checked yet
Specs
Deployment model Hybrid Not checked yet
Delivery guarantees Not checked yet Not checked yet
Ordering guarantees Not checked yet Not checked yet
Maximum message size Not checked yet Not checked yet
Supported protocols Not checked yet Not checked yet
Our review
Pros
  • Supports pub/sub, queues, request/reply, FIFO and dynamic routing
  • Connects through MQTT, AMQP, JMS, REST, WebSockets and Kafka
  • Combines persistent delivery, direct messaging, replay, HA and disaster recovery
  • Replicated event storage with configurable retention and log compaction
  • Stream processing supports joins, aggregations, filters, and transformations
  • Kafka Connect links systems including Postgres, Elasticsearch, and AWS S3
Cons
  • Proprietary rather than open source
  • Stream processing is not part of the broker
  • Schema Registry is a separate component
  • Self-hosted deployment places cluster operations on the deploying organization
  • Its broad API surface can require more architecture than a narrow broker
  • Kafka Connect integrations depend on source and sink connector setup
Our verdict

Solace PubSub+ Event Broker routes real-time events between applications, services and devices. It is designed for enterprise event-driven architectures, operational event distribution, hybrid-cloud integration and IoT messaging. Teams can…

Read the review →

Apache Kafka is an open-source distributed event streaming platform for data pipelines, streaming analytics, data integration systems, and mission-critical applications. It organizes events into topics and supports publishing, consuming,…

Read the review →
  1. Solace PubSub+ Event BrokerMessage Broker Software 9.2Free plan · 30-day trial
  2. Apache KafkaMessage Broker Software 9.0Open source

Strengths and trade-offs

  • Solace PubSub+ Event Broker — where it wins

    • Supports pub/sub, queues, request/reply, FIFO and dynamic routing
    • Connects through MQTT, AMQP, JMS, REST, WebSockets and Kafka
    • Combines persistent delivery, direct messaging, replay, HA and disaster recovery

    Where it doesn't

    • Proprietary rather than open source
    • Stream processing is not part of the broker
    • Schema Registry is a separate component

  • Apache Kafka — where it wins

    • Replicated event storage with configurable retention and log compaction
    • Stream processing supports joins, aggregations, filters, and transformations
    • Kafka Connect links systems including Postgres, Elasticsearch, and AWS S3

    Where it doesn't

    • Self-hosted deployment places cluster operations on the deploying organization
    • Its broad API surface can require more architecture than a narrow broker
    • Kafka Connect integrations depend on source and sink connector setup
  • Solace PubSub+ Event Broker9.2/10 · Free plan · 30-day trial

    A broad hybrid event broker for teams connecting applications, services and devices.

    Visit SolaceFull verdict →
  • Apache Kafka9.0/10 · Open source

    A broad open-source foundation for event streaming, integration, and stream processing.

    Visit Apache KafkaFull verdict →

More comparisons

All message broker software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026

Last updated · How we research and update