CopilotKit Review 2026

Open-source React framework for adding in-app AI copilots — chat sidebars, autocomplete, and agents that can read state and call your app's actions.

CopilotKit is the leading open-source library for adding embedded AI copilots to React apps. Instead of stitching a chat widget onto your product and calling an LLM directly, CopilotKit gives you React primitives that make the AI aware of app state ("the user is on the invoices page") and able to take actions ("create an invoice for $X") through typed action definitions. That structure means the copilot behaves less like a bolted-on chatbot and more like a real assistant that can complete tasks. The library ships components for chat sidebars, popups, and inline copilot textareas, plus hooks like useCopilotAction and useCopilotReadable that connect app data and behavior to the AI. On the runtime side, CopilotKit works with OpenAI, Anthropic, Groq, and LangGraph-based agents through CoAgents, which lets you run stateful multi-step agents inside a React app and stream progress to the UI. It also has first-class integrations with LangChain, LlamaIndex, and Vercel AI SDK. CopilotKit Cloud is a hosted runtime that handles auth, rate limits, and streaming; pricing starts free (unlimited local dev), with paid tiers at $39/month (Starter), $100/month (Teams) and $500/dev/month (Enterprise) for higher usage and premium features. CopilotKit fits SaaS teams that want to add an assistant that can actually do things inside their product, and full-stack developers who prefer typed React APIs over ad-hoc prompt code.

What CopilotKit does in practice