Comparison

NATS vs Solace

On the evidence we track, NATS leads this comparison with a composite score of 75/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

NATS full profile →Solace full profile →

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★NATS75

Solace39

Attribute comparison across 2 tools
Attribute	NATSLeader	Solace
Vioscale score	75 / 100low · 48%	39 / 100low · 7%
Pricing
Free tierpricing.free_tier	✓	-
Modelpricing.model	open_source	-
Price levelpricing.price_level	free	-
Integrations
Countintegrations.count	-	4
Security
Gdprsecurity.gdpr	✓	-
Scorecardsecurity.scorecard	7.2	-
Vulnerabilitiessecurity.vulnerabilities	Count: 29 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fnats-io%2Fnats-server%2Fv2&per_page=100 · Last 12m: 14 · Max severity: CRITICAL	-
Adoption
Dependent reposadoption.dependent_repos	24,884	-
Github starsadoption.github_stars	20,599	-
Package downloads weeklyadoption.package_downloads_weekly	1,291,214	-
Activity
Commits last 30dactivity.commits_last_30d	100	-
Release
Cadence daysrelease.cadence_days	1	-
Historyrelease.history	20 items	-
License
Spdxlicense.spdx	Apache-2.0	-
Language
Primarylanguage.primary	Go	-
Market
Availabilitymarket.availability	Available worldwide	-

Score

Vioscale score

NATS75 / 100low · 48%

Solace39 / 100low · 7%

Pricing

Free tier

NATS✓

Solace–

Model

NATSopen_source

Solace–

Price level

NATSfree

Solace–

Integrations

Count

NATS–

Solace4

Security

Gdpr

NATS✓

Solace–

Scorecard

NATS7.2

Solace–

Vulnerabilities

NATSCount: 29 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fnats-io%2Fnats-server%2Fv2&per_page=100 · Last 12m: 14 · Max severity: CRITICAL

Solace–

Adoption

Dependent repos

NATS24,884

Solace–

Github stars

NATS20,599

Solace–

Package downloads weekly

NATS1,291,214

Solace–

Activity

Commits last 30d

NATS100

Solace–

Release

Cadence days

NATS1

Solace–

History

NATS20 items

Solace–

License

Spdx

NATSApache-2.0

Solace–

Language

Primary

NATSGo

Solace–

Market

Availability

NATSAvailable worldwide

Solace–

Capabilities

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

Capability comparison for Message Queues
Capability	NATS	Solace
Core
Messaging paradigm	Pub/sub	Pub/sub
Correctness
Delivery guarantee	-	At-most-once
Ordering guarantee	-	Per-partition
Durability
Durable replayable log	✓	✗
Message replay / rewind	✓	-
Interop
Wire protocol	-	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

NATSPub/sub

SolacePub/sub

Correctness

Delivery guarantee

NATS-

SolaceAt-most-once

Ordering guarantee

NATS-

SolacePer-partition

Durability

Durable replayable log

NATS✓

Solace✗

Message replay / rewind

NATS✓

Solace-

Interop

Wire protocol

NATS-

SolaceMQTT, REST, JMS, Direct

Kafka-protocol compatible

NATS-

Solace-

Scale

Partitioned horizontal scaling

NATS✓

Solace✓

Geo / cross-region replication

NATS-

Solace-

Consumption

Consumer groups / competing consumers

NATS✓

Solace✓

Dead-letter queue

NATS-

Solace-

Deployment

Managed cloud offering exists

NATS-

Solace✓

Hosting

NATSSelf-hosted only

SolaceCloud + self-hosted

Processing

Built-in stream processing

NATS-

Solace-

What each one is

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

NATS

Leader

NATS enables components of a distributed software system to send messages to each other. It is an open-source project maintained by the Cloud Native Computing Foundation and can be deployed across cloud environments, on-site servers, edge computing devices, and embedded systems.

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.

NATS

Leader

Open source

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	NATS	Solace
LinuxPlatforms	✗	✓
CLIPlatforms	✓	✓
Cloud / SaaSDeployment	✓	✓
Self-hostedDeployment	✓	✓
On-premiseDeployment	✓	✗

Platforms

Linux

NATS✗

Solace✓

CLI

NATS✓

Solace✓

Deployment

Cloud / SaaS

NATS✓

Solace✓

Self-hosted

NATS✓

Solace✓

On-premise

NATS✓

Solace✗

Integrations

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

NATS

Leader

Not documented yet.

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.