redux-observable is a middleware library for Redux that allows developers to manage side effects in their applications using RxJS. It enables the handling of asynchronous actions, such as API calls or complex event handling, in a more declarative and functional manner. By leveraging observables, redux-observable provides a powerful way to compose and manage side effects, making it easier to handle complex asynchronous workflows in a Redux-based application.

One of the primary alternatives to redux-observable is redux-saga. Like redux-observable, redux-saga is a middleware library for managing side effects in Redux applications, but it uses generator functions to handle asynchronous flows. This approach allows developers to write asynchronous code that looks synchronous, making it easier to read and maintain. redux-saga is particularly well-suited for applications that require complex side effect management, such as handling multiple concurrent requests or coordinating complex workflows.

Both libraries offer powerful solutions for managing side effects in Redux applications, but they differ in their approaches. redux-observable uses the reactive programming paradigm with RxJS, while redux-saga relies on generator functions. The choice between the two often depends on the developer's familiarity with RxJS or generator functions and the specific needs of the application.

To see how redux-observable compares with redux-saga, check out the comparison: Comparing redux-observable vs redux-saga.