CopilotKit

As an AI developer tool for adding copilots and agents to existing apps, CopilotKit is built around React.

It gives you plug and play components, some pre-built and some customizable, so you can put a chat-style assistant inside a product you already ship instead of building the interface from scratch.

The project is open source, which means you can change the components to fit your app and community contributions are part of how it grows.

CopilotKit works with agent frameworks such as LangGraph and CrewAI, and it includes tools for grounding the AI in real-time user context, so the assistant can respond to what a person is actually doing in your application.

That context piece is the main reason to look at it over a bare chat widget.

You need to be comfortable with React for the integration to go smoothly, and complex agentic workflows may need extra setup beyond the basic components.

The documentation is spread across several pages, so expect to do some navigating before everything clicks.

It works for React teams more than non-developers.