Both Redux Thunk and Redux Saga take care of dealing with side effects. In most of the scenarios, Thunk uses Promises to deal with them, whereas Saga uses Generators . Thunk is simple to use and Promises are familiar to many developers, Sagas/Generators are more powerful but we will need to learn them. But both middleware can coexist, so we can start with Thunks and introduce Sagas when/if we need them.