Head-to-Head: Harlem vs Overmind Analysis


v3.1.8(6 months ago)

This package is actively maintained.Types definitions are bundled with the npm packageNumber of direct dependencies: 1Monthly npm downloads

@harlem/core is a state management library for JavaScript applications. It provides a simple and intuitive API for managing application state and handling state changes. With @harlem/core, you can easily define and update reactive state variables, create computed properties, and subscribe to state changes.

Alternatives: redux, mobx, vuex

Tags: javascriptstate-managementreactivelightweight


v28.0.3(3 months ago)

This package is actively maintained.Types definitions are bundled with the npm packageNumber of direct dependencies: 4Monthly npm downloads

Overmind is a powerful state management library for building scalable applications in JavaScript and TypeScript. Overmind focuses on simplicity, predictability, and ease of testing, while still providing tons of useful features, such as time-travel debugging, hot-module reloading, and middleware support. With Overmind, developers can easily manage complex state trees and simplify their codebase through its centralized state management principle. Its modular structure also makes it easy to compose and reuse functionalities across different applications.

Alternatives: redux, mobx, Vuex

Tags: javascripttypescriptstate-managementtime-travel-debuggingmodular



Both @harlem/core and Overmind have gained popularity in the JavaScript community, but Overmind has a larger user base and a more established presence.

State Management

@harlem/core is a state management library for React applications that follows a lightweight and minimalistic approach. It provides a simple yet powerful API for managing global state. Overmind, on the other hand, is a full-featured state management solution that supports React, Vue, and Angular. It offers a highly extensible and opinionated approach to managing state, with many built-in features and integrations.

Developer Experience

Both libraries provide a good developer experience. @harlem/core offers a straightforward setup and has a smaller learning curve. It focuses on simplicity and providing a clean API for state management. Overmind, on the other hand, has a more complex setup and configuration process due to its extensive feature set. It offers strong typing support and comprehensive documentation.

Community and Ecosystem

Overmind has a larger and more active community compared to @harlem/core. It benefits from a thriving ecosystem with extensive community support, including plugins and extensions. @harlem/core, being a relatively newer library, has a smaller but growing community and a more limited ecosystem.


Both @harlem/core and Overmind provide flexibility in managing state. However, @harlem/core is more lightweight and minimalistic, allowing developers to have more control over how they structure and organize their state. Overmind, with its extensive set of features, provides more out-of-the-box functionality, making it suitable for larger and more complex applications.

Learning Curve

@harlem/core has a smaller learning curve compared to Overmind. Its API is straightforward and easy to understand, making it a good choice for developers who prefer a simpler state management solution. Overmind, with its extensive feature set and configuration options, has a steeper learning curve but offers more flexibility and power in managing state.