21st.dev
PickComponents
1,000+ community-built UI components you can copy into an agent workflow.
Your coding agent can build fast. Give it better taste.
7 resources · 6 categories · last updated September 2026
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Components
1,000+ community-built UI components you can copy into an agent workflow.
Agent memory
Persistent memory for coding agents that survives the session.
UI blocks
Copy-paste UI blocks for AI agent interactions — thinking states, tool calls, and streaming output.
Components
Components for AI products, installed by pasting a prompt into your coding agent.
MCP
Real product UI you can copy directly as an AI prompt or MCP.
DESIGN.md
High-quality DESIGN.md examples agents can read from real product websites.
Prompts
286 layout components with ready-to-use prompts for vibe coding.
Your coding agent can build fast. Give it better taste — UI blocks for agent conversations, component kits for AI products, ready-to-use prompts, DESIGN.md examples, persistent memory, and real product UI you can copy as a prompt or MCP.
This shelf is not another list of IDEs. It is the reference material you hand an agent before it invents another generic landing page: AICSS, Halaska UI, VibePrompt, Refero Styles, agentmemory, 21st.dev, and Kage.
Each listing links to the official site with an original note on what to feed the agent. Use search and category filters to jump from components to prompts to memory.