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Apache Iggy vs Apache Pulsar

The same facts for both, read from GitHub every night, and the relation a person reviewed.

Apache IggyApache Pulsar
LanguageRustJava
LicenceApache-2.0Apache-2.0
Stars5k15k
Latestserver-0.9.0v5.0.0
Last push2026-10-062026-10-05
Release cadenceabout 99 days between releasesabout 1 day between releases
Active contributors50 commit authors on the default branch in the last 90 days47 commit authors on the default branch in the last 90 days
Flagsnonenone

How they relate

  • Both replace Apache Kafka. Alternatives to Apache Kafka →

    PartialApache IggyPersistent message streaming in Rust over TCP, QUIC and HTTP, with its own protocol and clients.

    Full replacementApache PulsarStreaming and pub/sub with storage separated from the brokers, multi-tenant.