Signals-first reactivity for Dart and Flutter.

Alien Signals packages a reusable reactive system, a high-performance signals preset, and an ergonomic surface API for apps, libraries, and tooling.

Read the guide →

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Layered reactive core

Build on the reusable ReactiveSystem, the higher-level signals preset, or the convenience surface API depending on how much control you need.

Signal primitives with a small surface area

signal(), computed(), and effect() cover the common workflow without turning the package into a large framework.

Useful for both apps and tooling

Alien Signals fits UI state, reactive domain logic, and lower-level library work across Dart and Flutter projects.

A meaningful public project line now

Alongside Spry and Oref, Alien Signals gives Odroe a second active reactive story that is easier to explain and share than older historical packages.

Start here

Read the Guide for the system, preset, and surface layers.
Browse the API docs when you need the exact surface area.
See the examples for runnable code.
If you want the broader Odroe project line, go back to /packages and start from Spry, Alien Signals, and Oref together.