Build powerful reactive, concurrent, and distributed applications more easily

Akka is a toolkit for building highly concurrent, distributed, and resilient message-driven applications for Java and Scala.

Akka Insights is intelligent monitoring and observability purpose built for Akka.

Why Akka? Try Akka Akka Insights

Akka is the implementation of the Actor Model on the JVM.

  • cluster

    Simpler Concurrent & Distributed Systems

    Actors and Streams let you build systems that scale up, using the resources of a server more efficiently, and out, using multiple servers.

  • resilience

    Resilient by Design

    Building on the principles of The Reactive Manifesto Akka allows you to write systems that self-heal and stay responsive in the face of failures.

  • speed

    High Performance

    Up to 200 million msg/sec on a single machine. Small memory footprint; ~2.5 million actors per GB of heap.

  • cloud

    Elastic & Decentralized

    Distributed systems without single points of failure. Load balancing and adaptive routing across nodes. Event Sourcing and CQRS with Cluster Sharding. Distributed Data for eventual consistency using CRDTs.

  • streams

    Reactive Streaming Data

    Asynchronous non-blocking stream processing with backpressure. Fully async and streaming HTTP server and client provides a great platform for building microservices. Streaming integrations with Alpakka.


Akka Licensing Change

Lightbend changed the license on all Akka modules from Apache 2.0 to the BSL v1.1 (Business Source License) starting with Akka v2.7, which was released in October 2022.

Read the FAQ and visit for more details and to learn what this means for organizations with less than $25M in annual revenue and for those with over $25M in annual revenue.

“We have decided to change Akka’s license to ensure a healthy balance between all parties, shared responsibility, and, by extension, contribute to Akka’s future development,”

—Jonas Bonér, Lightbend’s founder and CEO, and creator of Akka

Sponsored by


Lightbend is the company behind Akka, used by development teams to build the most demanding, globally distributed, cloud native application environments and streaming data pipelines. Global 2000 enterprises turn to Lightbend products like Kalix and Akka to support their most business-critical initiatives.


High-performance microservices and APIs with no operations required

Documentation | Example Projects

Get the full power of Akka reactive microservices frameworks and runtimes


Intelligent monitoring and observability purpose built for Akka.

Learn More | Talk to an Expert

Proven in production

Organizations with extreme requirements rely on Akka and other Lightbend technologies.
Read about some of the successful journeys and case studies.


Latest News

See our news and articles for more good reads