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Databases · head to head

Apache Pulsar vs SST

Apache Pulsar logo

Apache Pulsar

Databases

Cloud-native messaging and streaming with separated storage

From
Free
Rated
-
Full reviewWebsite
SST logo

SST

Cloud

Build full-stack apps on your own infrastructure

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Apache Pulsar more components than Kafka: brokers, BookKeeper and ZooKeeper each need operating; SST primarily optimized for AWS with Cloudflare support
  • They diverge on capability: Apache Pulsar covers Separated storage, SST covers Single config file.
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Apache Pulsar and SST actually diverge.

Attributes where Apache Pulsar and SST differ
AttributeApache PulsarSST
Pricing modelOpen source, no licence feeUnknown
PlatformsLinux, Docker, Kubernetes, Self-hostedAWS, Cloudflare, Node.js
CategoryDatabasesCloud

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

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 Apache Pulsar

  • Separated storage
  • Queuing and streaming
  • Built-in multi-tenancy
  • Geo-replication

Only in SST

  • Single config file
  • Resource linking
  • Local development
  • Multi-cloud support
  • Multiple deployment stages
  • VPC tunneling

What people use each for

The jobs each tool is most often brought in to do.

Apache Pulsar

  • Platforms needing both work queues and replayable streams without running two systemsnot SST
  • Multi-tenant messaging where isolation between teams is a requirementnot SST
  • Deployments where storage and traffic grow at genuinely different ratesnot SST

SST

  • Deploying Next.js frontends with serverless backendsnot Apache Pulsar
  • Managing databases and storage alongside application codenot Apache Pulsar
  • Creating staging environments for feature testingnot Apache Pulsar

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Apache Pulsar

  • More components than Kafka: brokers, BookKeeper and ZooKeeper each need operating
  • Correspondingly harder to run well, and the expertise is rarer than Kafka expertise
  • A much smaller ecosystem of connectors, tooling and hiring pool than Kafka
  • The architectural advantages only pay off at a scale most deployments never reach

SST

  • Primarily optimized for AWS with Cloudflare support
  • Learning curve for developers unfamiliar with infrastructure concepts
  • Limited documentation for some advanced use cases

Pricing, plan by plan

Apache Pulsar

Free
  • Apache PulsarFree
    • Full functionality
    • No usage limits
    • Community support

SST

Free

No published plan breakdown. See the SST review.

Which should you pick?

Choose Apache Pulsar if

  • You need separated storage.
  • You want to start without paying.
  • You work on Linux, Docker, Kubernetes, Self-hosted.
  • You also want queuing and streaming.
Apache Pulsar review

Choose SST if

  • You need single config file.
  • You want to start without paying.
  • You work on AWS, Cloudflare, Node.js.
  • You also want resource linking.
SST review

Questions people ask

Is Apache Pulsar or SST better?
Neither clearly leads. Apache Pulsar starts at Free and SST at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Apache Pulsar or SST?
Apache Pulsar starts at Free and SST at Free.
Does Apache Pulsar or SST run on more platforms?
Apache Pulsar runs on Linux, Docker, Kubernetes, Self-hosted. SST runs on AWS, Cloudflare, Node.js.
Can I use Apache Pulsar for free?
Both have a free tier, so you can try either at no cost before committing.
What is Apache Pulsar best used for?
Apache Pulsar is most often used for platforms needing both work queues and replayable streams without running two systems, multi-tenant messaging where isolation between teams is a requirement, deployments where storage and traffic grow at genuinely different rates. Of those, platforms needing both work queues and replayable streams without running two systems and multi-tenant messaging where isolation between teams is a requirement are not what SST is typically brought in for.
What can Apache Pulsar do that SST cannot?
Apache Pulsar covers Separated storage, Queuing and streaming, Built-in multi-tenancy, Geo-replication. SST covers Single config file, Resource linking, Local development, Multi-cloud support.

Answered from the vendors’ own pages

Apache Pulsar: Is Apache Pulsar free?

Yes, open source under the Apache Software Foundation.

SST: Is SST free?

Yes, SST is open source and free. You only pay for cloud resources from AWS and other providers.

Source
Apache Pulsar: Pulsar or Kafka?

Pulsar separates storage from compute and covers queuing and streaming in one system. Kafka has a far larger ecosystem and hiring pool. Most teams should have a specific reason before choosing Pulsar.

SST: What cloud providers does SST support?

SST supports over 150 providers through built-in AWS and Cloudflare components, plus Pulumi and Terraform providers.

Source
Apache Pulsar: Why does separated storage matter?

Brokers hold no data, so adding or replacing one requires no rebalancing, and storage can grow without adding serving capacity.

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