CopilotKit vs LangGraph.js
CopilotKit and LangGraph.js are both agent frameworks. CopilotKit is published by CopilotKit and LangGraph.js by LangChain. On GitHub, CopilotKit has 38,211 stars and LangGraph.js has 3,370. Both were last active in Oct 2026. The table lines up where they differ (publisher, GitHub stars, weekly downloads and category) and has the install commands for both. Everything here comes from the listings' public sources and is refreshed daily. CopilotKit describes itself as: Open-source SDK that connects AI agents to app front ends with chat UI, generative UI, shared state and human approvals; creator of the AG-UI protocol. LangGraph.js: Open-source agent harness from LangChain for building agents with code, with LangSmith for testing and monitoring. Licenses: CopilotKit MIT, LangGraph.js MIT.
Updated Oct 26, 2026 · Built from catalog data; how we rank and grade
CopilotKit
CopilotKit
Open-source SDK that connects AI agents to app front ends with chat UI, generative UI, shared state and human approvals; creator of the AG-UI protocol.
LangGraph.js
LangChain
Open-source agent harness from LangChain for building agents with code, with LangSmith for testing and monitoring.
Who should pick which
- Pick CopilotKit if you want MCP support built in.
- Pick LangGraph.js if you want a stable release (CopilotKit is marked beta).
- CopilotKit has the larger community: 38,211 GitHub stars against 3,370.
From listing data only. We don't pick a winner on security beyond the grades; read how grades work.
Side by side
| Fact | CopilotKit | LangGraph.js |
|---|---|---|
| Type | Harness | Harness |
| Publisher | CopilotKit | LangChain |
| License | MIT | MIT |
| Pricing | Not stated | Not stated |
| Runs | Not stated | Not stated |
| Auth | Not stated | Not stated |
| Hosts supported | Not stated | Not stated |
| Tools | Not listed yet | Not listed yet |
| Security grade | –Security: not graded yet | –Security: not graded yet |
| Freshness grade | AFreshness: A | AFreshness: A |
| GitHub stars | 38,211 | 3,370 |
| Weekly downloads | 286,211 | 2,326,897 |
| Last release | Oct 16, 2026 | Oct 22, 2026 |
| Last activity | Oct 24, 2026 | Oct 22, 2026 |
Facts from each listing's public sources, checked daily. Tool lists arrive with tool scans.
Install
CopilotKit
npm install @copilotkit/react-core
LangGraph.js
npm install @langchain/langgraph
Also consider
- 0.867score
Pi Agent Core
Earendil
Minimal TypeScript agent harness with an agent runtime, multi-provider LLM API, terminal UI and coding agent CLI that users extend themselves.
HarnessAFreshness: A★ 117.6K↓ 5.1M/wk - 0.799score
Letta
Letta
Open-source agent harness for stateful agents whose memory persists and improves with use, with a terminal UI, app server and TypeScript SDK.
HarnessAFreshness: A★ 25.2K↓ 40.7K/wk - 0.787score
trueforge
truefoundry
Open-source agent harness that runs the model loop for you, with MCP tools, skills, sandboxing, approvals and a chat UI.
HarnessAFreshness: A★ 6.4K
Questions
- Is CopilotKit or LangGraph.js more popular?
- CopilotKit has more GitHub stars (38,211 against 3,370). Stars measure attention, not quality, so check freshness and docs too.
- Are CopilotKit and LangGraph.js open source?
- Yes: CopilotKit is MIT and LangGraph.js is MIT.
Related
- AlternativesAlternatives to CopilotKit
- AlternativesAlternatives to LangGraph.js
- Best ofBest agent frameworks for TypeScript
- Best ofBest agent frameworks for building AI agents
- ComparisonCopilotKit vs Pi Agent Core
- ComparisonCopilotKit vs Letta
- ComparisonCopilotKit vs Deep Agents
- ComparisonLangGraph.js vs Pi Agent Core
- ComparisonDeep Agents vs LangGraph.js
Cite this page
CopilotKit vs LangGraph.js. Agent Mart. https://agentmart.dev/compare/copilotkit-vs-langgraph-js (last updated 2026-10-26)