React Easy State is described as 'Easy State provides a healthy balance of local and global state management for React in a simple, scalable way' and is an app. There are four alternatives to React Easy State for Self-Hosted solutions and Online / Web-based. The best alternative is Redux.js, which is both free and Open Source. Other great apps like React Easy State are Recoil, Hookstate and MobX.
MobX is a state manager - simple and scalable by transparently applying functional reactive programming (TFRP) :
Anything that can be derived from the application state, should be derived. Automatically.