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23 Best 21st.dev Alternatives & Competitors
The top alternatives to 21st.dev in the Agent Frameworks space, compared on features, pricing, and what they're best at.
Updated April 29, 2026
Why look beyond 21st.dev?
21st.dev is the largest React component registry for the agentic internet — an open-source, community-driven marketplace of shadcn/ui-based React + Tailwind components, blocks, and hooks. It functions like 'npm for design engineers,' letting developers browse and install reusable interface elements directly into their projects.
Common reasons users explore alternatives
- Quality varies across community-contributed components
- Pricing for the agent SDK side is still unclear
- shadcn/ui-only — limited if your stack uses a different UI kit
- Newer than incumbent component libraries (MUI, Chakra)
Top alternatives to 21st.dev
LangChain
LangChain Expression Language (LCEL)
AutoGPT
Visual workflow builder with composable agent 'blocks'
LangGraph
Graph-based agent workflows with nodes, edges, and conditional routing
Strands
OpenAI Agents SDK
Llama Stack
GripTape
CrewAI
Multi-agent role-based collaboration
Google ADK
AutoGen
Multi-agent conversation framework
Vercel AI SDK
TypeScript-first AI SDK
Dify
Visual workflow builder for AI apps
DSPy
Semantic Kernel
Enterprise AI orchestration by Microsoft
Instructor
Pydantic AI
Type-safe agent inputs, outputs, and tool calls via Python type hints
Hermes Agent
Persistent memory across sessions in ~/.hermes/memories/
Agno
23+ LLM providers (OpenAI, Anthropic, Gemini, etc.) and 100+ tool integrations
Atomic Agents
Built on Instructor for structured outputs
Smolagents
Terminal Use
Agent hosting & deployment
Mastra
TypeScript agent framework
Run Agent Frameworks in production with Respan
One platform for routing, observability, tracing, and evals across every LLM provider.