Hookstate is described as 'Easy to Use Concise, pragmatic but flexible API. Very easy to learn. See Getting Started and other code samples to learn it in minutes. Incredibly Fast'. There are three alternatives to Hookstate, not only websites but also apps for Self-Hosted solutions. The best alternative is Redux.js, which is both free and Open Source. Other great sites and apps similar to Hookstate are React Easy State (Free, Open Source) and MobX (Free, Open Source).
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.