# UI — card for AI agents

A library of behaviors for agents to build the next generation of user interfaces.

Maker: Vercel Labs · category: Agent frameworks and SDKs · open source (Apache-2.0)

## Price
- Open source under the Apache-2.0 licence; check the website for any paid hosted plans.
- Free tier: yes
- Checked: 2026-11-14

## Facts
- Repository: https://github.com/vercel-labs/ui

## Numbers (AgentGid data)
- GitHub stars: 4,055

## Details (plan limits, live status, safety; from AgentGid's data)
UI by Vercel Labs. Category: Agent frameworks and SDKs. Type: . A library of behaviors for agents to build the next generation of user interfaces. Open source (Apache-2.0) Pricing (checked 2026-11-14): Open source under the Apache-2.0 licence; check the website for any paid hosted plans. Free tier: yes. Data: 4,055.0 GitHub stars.

## Alternatives in the same category
- LangChain: https://agentgid.com/agents/langchain/agent.md
- LangGraph: https://agentgid.com/agents/langgraph/agent.md
- AI SDK: https://agentgid.com/agents/vercel-ai-sdk/agent.md
- Claude Agent SDK: https://agentgid.com/agents/claude-agent-sdk/agent.md
- OpenAI Agents SDK: https://agentgid.com/agents/openai-agents-sdk/agent.md
- Mastra: https://agentgid.com/agents/mastra/agent.md

## Links
- AgentGid page: https://agentgid.com/agents/ui/
- Source: https://ui-sdk.dev
- Source: https://github.com/vercel-labs/ui

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