The CopilotKit Stack

From frontend platform to model provider — every layer, every choice

Frontend Platform

Where your UI runs

Web

React

Angular

Svelte

Vue

TanStack

Native

React Native

SwiftUI

Android

Messaging

Slack

Teams

WhatsApp

Chat UI

Pre-built → customized → headless

OPINIONATED

FULL CONTROL

CopilotChat

CopilotSidebar

CopilotPopup

CSS Variables

Slots

Custom Sub-Components

Headless (useAgent)

Generative UI

Controlled → declarative → open

MORE CONTROL

MORE FREEDOM

Controlled

Tool-Based

Agentic

Interrupt-Based

Declarative (BYOC)

A2UI

Hashbrown

JSON Render

OpenGenUI

Tambo

Open

Fully Agent-Generated

MCP Apps

Interaction Patterns

How users and agents collaborate

Human in the Loop

Frontend Tools

Tool Rendering

Readables

Agent Context

Suggestions

Voice

Multi-modal

State Sync

Shared state between UI and agent

State Reading

State Writing

State Streaming

I/O Schemas

State Rendering

CopilotKit

Runtime · SDK · React Bindings

AG-UI Protocol

Agent ↔ UI interop standard

Agent Frameworks

Libraries you write agent code with

Agent ↔ Agent

A2A

Open Agent Spec

Agents communicate
with each other

LangGraph

Mastra

CrewAI

PydanticAI

AG2

Agno

LlamaIndex

Langroid

AWS Strands

Spring AI

MAF

Agent ↔ Tools

MCP

Agents discover &
call external tools

Agent Platforms

Where you deploy and run your agents

LangSmith / LangGraph Cloud

AWS Agent Core

Google Vertex AI

Azure AI Foundry

Cloudflare Workers

Vercel

Render / Railway / Fly

LLM Providers

The models powering your agents

OpenAI

Anthropic

Google

AWS Bedrock

Azure OpenAI

Groq

Ollama

Any OpenAI-compatible