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CopilotKit

Category: AI Developer Tools

Open-source enterprise agentic frontend stack for building AI agents with generative UI inside applications CopilotKit was founded in 2023. The company is led by Atai Barkai. Based in Seattle, Washington, United States. Team size: 21-50. Total funding raised: $27M. Latest round: Series A. Key investors include Glilot Capital; NFX; SignalFire; Discovery Ventures; Vermilion Cliffs Ventures; Davidovs Venture Collective (DVC); Abstraction Capital; 97212 Ventures; Deep Acre; J-Ventures Fund; Gurtin Ventures; Fresh.Fund.

Founded
2023
Headquarters
Seattle, Washington, United States
Team size
21-50
Total funding
$27M

Value proposition

CopilotKit provides the frontend infrastructure (SDKs, AG-UI protocol, Enterprise Intelligence Platform) that lets developers build and deploy AI agents that live inside applications with rich, interactive UIs — moving beyond chatbots to agent-native experiences.

Products and solutions

1) CopilotKit Frontend SDKs (React, Angular) — open-source SDK for building agentic UIs; 2) AG-UI Protocol — open standard for agent-user interaction, adopted by Google, AWS, Microsoft, Oracle, LangChain, Mastra, PydanticAI; 3) CopilotKit Enterprise Intelligence Platform — self-hostable enterprise product with persistent threads, analytics, real-time learning; 4) Generative UI capabilities (A2UI, MCP Apps support)

Unique value

Vendor-neutral, horizontal enterprise agentic frontend stack that works with any agent framework, cloud provider, or backend — unlike vertically integrated alternatives. Open-source AG-UI protocol is an industry standard adopted by major cloud providers. Self-hostable for enterprise compliance.

Target customer

Enterprise engineering teams at Fortune 500 companies and developers building agentic applications; companies using Google, AWS, Microsoft, Oracle, LangChain, Mastra stacks

Industries served

Enterprise software, financial services, telecommunications, legal tech, healthcare technology

Technology advantage

Creator of AG-UI (Agent-User Interaction) protocol — an open standard for bidirectional agent-to-UI communication that complements MCP (agent-to-tools) and A2A (agent-to-agent). Deep integrations with Google Cloud, AWS, Microsoft, Oracle, LangChain, Mastra, PydanticAI, TanStack, AG2, Agno. 40K+ GitHub stars, 4M+ weekly installs. Majority of Fortune 500 and Global 50 use the tools in production.

How they differentiate

Horizontal, vendor-neutral approach vs. vertically integrated stacks. Supports any agent framework, cloud provider, or backend. Self-hostable enterprise option. Open protocol (AG-UI) that's become an industry standard. Focus on the frontend/UI layer specifically rather than full-stack lock-in.

Main competitors

Vercel AI SDK; assistant-ui; OpenAI Apps SDK

Key partnerships

Google (A2UI spec collaboration, Google Cloud Next stage session); AWS (dedicated AG-UI endpoint in AgentCore, FAST template); Microsoft (Agent Framework + AG-UI integration); Oracle (AG-UI adopted for Agent Spec); LangChain; Mastra; PydanticAI; TanStack; AG2; Agno

Notable customers

Docusign; Cisco; S&P Global; Deutsche Telekom; Function Health

Major milestones

2023: Founded as Tawkit Inc., joined Techstars Seattle cohort; 2023: Pivoted from tawkitAI (AI podcast platform) to CopilotKit after open-sourcing internal infrastructure; 2025: Seed round ($7M); 2025-2026: AG-UI protocol adopted by Google, AWS, Microsoft, Oracle, LangChain, Mastra, PydanticAI; 2026-05: $20M Series A ($27M total) led by Glilot Capital, NFX, SignalFire; 2026-05: Launched CopilotKit Enterprise Intelligence Platform

Growth metrics

40K+ GitHub stars; 4M+ weekly npm installs; tens of millions of agent-user interactions per week; majority of Fortune 500 and Global 50 using in production

Market positioning

Leading open-source standard for the agentic frontend layer. Positioned as the "AG-UI protocol company" — the neutral interface layer between any agent backend and any user-facing application. Competing against Vercel's more vertically integrated AI SDK and OpenAI's ChatGPT-centric Apps SDK.

Geographic focus

Global (US-headquartered, Seattle-based, with Israeli founder roots and engineering team in Seattle)

About Atai Barkai

Ex-Meta (media infrastructure lead); Ex-Doximity (led flagship iOS app development); B.S./M.S. Physics, University of Pennsylvania

Official website: