Ractor – a Rust-based actor framework with clusters and supervisors
SOME HIGHLIGHTS. * We have a full supervision tree so actors can monitor other actors for exits and unhandled panic!s (at least the ones that can be caught) * The actor lifecycle is handled for you in a simple single-threaded, message handler primitive * You have a mutable state with each message handling call, so you have an easy way to create stateful actors and update that state as messages are processed * Actors talk to other actors by message passing, but there are remote-procedure-calls (RPCs) so actors can "ask a question" to another actor and wait on the reply. * A lot of the…
In plain words
Ractor is a Rust-based framework for building actor systems with built-in supervision trees, message passing, and remote procedure calls. It is designed for developers building concurrent and distributed applications. The framework handles actor lifecycles automatically, maintains mutable state within actors, enables inter-actor communication through messages and RPCs, and provides factory primitives for distributed processing pools. It includes early support for clustering and manages concurrency concerns like graceful and forceful termination.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
SOME HIGHLIGHTS. * We have a full supervision tree so actors can monitor other actors for exits and unhandled panic!s (at least the ones that can be caught) * The actor lifecycle is handled for you in a simple single-threaded, message handler primitive * You have a mutable state with each message handling call, so you have an easy way to create stateful actors and update that state as messages are processed * Actors talk to other actors by message passing, but there are remote-procedure-calls (RPCs) so actors can "ask a question" to another actor and wait on the reply. * A lot of the concurrency primitives are handled by the framework, such as cancellation/termination of actors (both graceful and forceful) * A Factory primitive in order to formulate distributed processing pools with multiple job routing options * Early but stable support for a distributed epmd-like cluster environment, where you can talk to actors over a network link. It's an additional crate (ractor_cluster) that builds on ractor to facilitate the inter-connection between nodes and support remote casts and calls to actors on a remote node. We're openly seeking feedback, so please feel free to utilize the library and let us know if there's anything you find missing or doesn't work as expected!
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