NATSvs
Apache Kafka
Apache Kafka: A durable replayable log with a large ecosystem, at much higher operational cost
NATS
High-performance messaging system for cloud-native applications
As of 29 August 2026, NATS is free to use. A CNCF messaging system built for simplicity and very low latency, with optional persistence through JetStream. Softwr lists it under Databases. NATS is made by Synadia, available on Linux, macOS, Windows, Self-hosted.
Overview
What NATS does
NATS is an open-source messaging system and a CNCF-graduated project, built around a small, fast core. Base NATS is fire-and-forget publish-subscribe with no persistence, which is why it is measured in microseconds rather than milliseconds. JetStream adds streaming, persistence and exactly-once semantics on top when durability is needed. Its operational story is unusually light for a messaging system: a single binary, no external dependencies, and clustering that is genuinely simple to configure. That combination is what draws teams who find Kafka and RabbitMQ heavier than the problem.
What people use it for
- Service-to-service messaging where latency is the binding constraint
- Edge and IoT messaging where a lightweight broker matters
- Replacing a heavier broker when the workload does not need its guarantees
Related searches
The honest half
Where it falls short
Concrete and checkable, so you can decide whether any of them matter to you. This is the half of a review a vendor will not write about NATS.
- Core NATS has no persistence at all, so messages are lost if no subscriber is listening
- JetStream adds the durability but also the operational complexity NATS is chosen to avoid
- A much smaller ecosystem than Kafka or RabbitMQ, with fewer connectors and integrations
- Fewer people know it, so hiring and existing organisational knowledge favour the alternatives
Cross-shopped
What people choose instead of NATS
Each pairing was judged by two reviewers asking whether a buyer would genuinely weigh the two against each other. The ones that failed were deleted rather than published.
- NATSvsRabbitMQ
RabbitMQ: A general-purpose broker with richer routing, heavier than NATS but lighter than Kafka
Pricing
What NATS costs
Taken from the vendor's own pricing page. Prices move, so check before you buy.
NATS
Free
- Full functionality
- No usage limits
- Community support
Capabilities
Features
Very low latency
Fire-and-forget core messaging measured in microseconds
JetStream
Optional persistence, streaming and replay when durability matters
Single binary
No external dependencies and straightforward clustering
Request-reply
Built-in request-reply pattern alongside publish-subscribe
Answered, with sources
Questions people ask
Each answer names the page it came from, so you can check it rather than take our word for it.
Is NATS free?
Yes, open source and CNCF-graduated. Synadia sells a managed service.
Does NATS persist messages?
Core NATS does not — it is fire-and-forget. JetStream adds persistence, streaming and replay when you need them.
NATS or Kafka?
NATS is far lighter and lower latency, and much simpler to run. Kafka is the answer when you need a durable replayable log and a large connector ecosystem.
Keep looking
Where to go from NATS
- NATS alternativesEvery product people weigh against it
- NATS pricingPlans, floors and what the tiers exclude
- NATS badgesWhich rules it meets, and the figure behind each
- All Databases softwareThe full category
- Best Databases softwareThe shortlist, and how it was cut
Best Databases software for
Compare NATS with
- Apache Pulsar
- RabbitMQ
- VerneMQ
- EMQX
- Redpanda
- Timeplus
- Solace PubSub+
- YugabyteDB
- Cockroach Labs
- SurrealDB
- Teradata
- TIBCO Enterprise Message Service
- turbopuffer
- Apache Kafka
- VerneMQ
- Timeplus
- Apache Flink
- Apache Druid
Other Databases software
Cloud-native messaging and streaming with separated storage
Open source10 researched notesErlang MQTT broker whose source is Apache 2.0 but whose official binaries need a paid subscription
Free plan12 researched notesErlang MQTT broker for large IoT fleets, relicensed to BSL with production free use limited to one node
Free, then $234/mo12 researched notesStreaming SQL engine built on ClickHouse internals, shipping as one small binary
Free, then $199/mo12 researched notesMulti-protocol event broker sold as software, cloud service or a hardware appliance
Free plan12 researched notesOpen source distributed SQL database for cloud native apps
Free, then $0.1/hour13 researched notesMulti-model database combining documents, graphs, vectors and time-series
Free plan9 researched notesLong-established enterprise MPP data warehouse, rebranded in 2026 as the Autonomous Knowledge Platform, sold for cloud, on-premises and hybrid.
Pricing on request14 researched notesJMS message broker underpinning bank and telecom estates, now maintained rather than expanded
Pricing on request12 researched notesClosed-source vector and full-text search service built directly on object storage, with cold queries measured in seconds rather than milliseconds.
From $16/mo14 researched notesErlang MQTT broker whose source is Apache 2.0 but whose official binaries need a paid subscription
Free plan12 researched notesStreaming SQL engine built on ClickHouse internals, shipping as one small binary
Free, then $199/mo12 researched notes
Softwr does not host reviews and shows no star rating for NATS, because a rating we did not collect is not ours to publish. What is here is the pricing and platform detail from the vendor’s own pages, limitations we could state concretely, and alternatives a reviewer confirmed people weigh against it. Tell us if any of it is wrong.
More on NATS
NATS alternatives
What people switch to, and what they give up
NATS pricing
Every tier, and where the cost actually lands
Compare NATS
Put it head to head with anything we hold
NATS badge
Its rating, and an embed for your own site
Best Databases software alternatives
Industrial process historian with published per-tag pricing and no client licence fees
Per tag band per year
NetApp-owned managed service for Cassandra, Kafka, OpenSearch, PostgreSQL and Cadence with a bring-your-own-cloud model
quoteErlang MQTT broker for large IoT fleets, relicensed to BSL with production free use limited to one node
Per month by connection and session volume
Attribute-based access control and masking applied inside Snowflake, Databricks and BigQuery
quote
MPP analytical database with a MySQL wire protocol and sub-second aggregation on wide tables
Open source, no licence fee
Streaming database that maintains incremental materialised views in SQL instead of Flink jobs
Per RisingWave Unit hour
Centralised data access governance from the creators of Apache Ranger, now rebranding as Trust3 AI
quote
The Meta-lineage distributed SQL query engine, distinct from the Trino fork
Open source, no licence fee