Comparison

Apache Kafka vs Solace

On the evidence we track, Apache Kafka leads this comparison with a composite score of 58/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Apache Kafka full profile →Solace full profile →

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★Apache Kafka58

Solace48

Attribute comparison across 2 tools
Attribute	Apache KafkaLeader	Solace
Vioscale score	58 / 100medium · 51%	48 / 100low · 7%
Pricing
Free tierpricing.free_tier	✓	-
Modelpricing.model	open_source	-
Price levelpricing.price_level	free	-
Integrations
Countintegrations.count	4	4
Security
Scorecardsecurity.scorecard	6.1	-
Vulnerabilitiessecurity.vulnerabilities	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fapache%2Fkafka&per_page=100 · Last 12m: 0	-
Adoption
Dependent reposadoption.dependent_repos	1	-
Github starsadoption.github_stars	33,629	-
Package downloads weeklyadoption.package_downloads_weekly	5,508,093	-
Activity
Commits last 30dactivity.commits_last_30d	100	-
License
Spdxlicense.spdx	Apache-2.0	-
Language
Primarylanguage.primary	Java	-
Market
Availabilitymarket.availability	Available worldwide	-

Score

Vioscale score

Apache Kafka58 / 100medium · 51%

Solace48 / 100low · 7%

Pricing

Free tier

Apache Kafka✓

Solace–

Model

Apache Kafkaopen_source

Solace–

Price level

Apache Kafkafree

Solace–

Integrations

Count

Apache Kafka4

Solace4

Security

Scorecard

Apache Kafka6.1

Solace–

Vulnerabilities

Apache KafkaCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fapache%2Fkafka&per_page=100 · Last 12m: 0

Solace–

Adoption

Dependent repos

Apache Kafka1

Solace–

Github stars

Apache Kafka33,629

Solace–

Package downloads weekly

Apache Kafka5,508,093

Solace–

Activity

Commits last 30d

Apache Kafka100

Solace–

License

Spdx

Apache KafkaApache-2.0

Solace–

Language

Primary

Apache KafkaJava

Solace–

Market

Availability

Apache KafkaAvailable worldwide

Solace–

Capabilities

Feature-by-feature on the axes that matter for message queues. “-” means undocumented, not absent.

Capability comparison for Message Queues
Capability	Apache Kafka	Solace
Core
Messaging paradigm	Pub/sub	Pub/sub
Correctness
Delivery guarantee	Exactly-once	At-most-once
Ordering guarantee	Per-partition	Per-partition
Durability
Durable replayable log	✓	✗
Message replay / rewind	✓	-
Interop
Wire protocol	Binary over TCP (SSL/SASL for authentication/encryption)	MQTT, REST, JMS, Direct
Kafka-protocol compatible	✓	-
Scale
Partitioned horizontal scaling	✓	✓
Geo / cross-region replication	✓	-
Consumption
Consumer groups / competing consumers	✓	✓
Dead-letter queue	-	-
Deployment
Managed cloud offering exists	✗	✓
Hosting	Self-hosted only	Cloud + self-hosted
Processing
Built-in stream processing	✓	-

Core

Messaging paradigm

Apache KafkaPub/sub

SolacePub/sub

Correctness

Delivery guarantee

Apache KafkaExactly-once

SolaceAt-most-once

Ordering guarantee

Apache KafkaPer-partition

SolacePer-partition

Durability

Durable replayable log

Apache Kafka✓

Solace✗

Message replay / rewind

Apache Kafka✓

Solace-

Interop

Wire protocol

Apache KafkaBinary over TCP (SSL/SASL for authentication/encryption)

SolaceMQTT, REST, JMS, Direct

Kafka-protocol compatible

Apache Kafka✓

Solace-

Scale

Partitioned horizontal scaling

Apache Kafka✓

Solace✓

Geo / cross-region replication

Apache Kafka✓

Solace-

Consumption

Consumer groups / competing consumers

Apache Kafka✓

Solace✓

Dead-letter queue

Apache Kafka-

Solace-

Deployment

Managed cloud offering exists

Apache Kafka✗

Solace✓

Hosting

Apache KafkaSelf-hosted only

SolaceCloud + self-hosted

Processing

Built-in stream processing

Apache Kafka✓

Solace-

What each one is

The product in its own terms, so the numbers below have context.

Apache Kafka

Leader

Apache Kafka is a free system for capturing, storing, and processing data streams in real time. It enables organizations to reliably move large volumes of data between applications and systems, with support for transformations, aggregations, and stateful processing.

Independently observed

Solace

A messaging service that enables developers to create event-driven applications and microservices using multiple programming languages and open protocols (MQTT, REST, JMS, proprietary Direct) across cloud and self-hosted deployment options.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Apache Kafka

Leader

Open sourceFree tier

as of 2026-08-14verify ↗

Solace

Pricing not documented yet.

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platform and deployment support comparison
Supports	Apache Kafka	Solace
LinuxPlatforms	✓	✓
CLIPlatforms	✓	✓
Cloud / SaaSDeployment	✗	✓
Self-hostedDeployment	✓	✓

Platforms

Linux

Apache Kafka✓

Solace✓

CLI

Apache Kafka✓

Solace✓

Deployment

Cloud / SaaS

Apache Kafka✗

Solace✓

Self-hosted

Apache Kafka✓

Solace✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

Apache Kafka

Leader

4 total

Postgres
JMS
Elasticsearch
AWS S3

Independently observed

Solace

4 total

AWS
Kafka
Spark
IBM WebSphere

Independently observed

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.