01
Vercel AI SDK
Also known as AI SDK
Pick this if Streaming AI features in a TypeScript web app
TypeScript toolkit for streaming, tool calls, and chat UI.
Free
8.5
VisitAlternatives · Agent frameworks
Best Mastra alternatives
Rankings as of
Mastra is an open-source TypeScript framework for agents, tools, workflows, and evals. It is aimed at web developers who want those pieces in their own repo rather than a Python stack. Use it when a Next.js or Node app is growing an agent and the Vercel AI SDK is no longer the whole design.
Mastra scores 8.0 in Agent frameworks (The harness around a model). The 6 alternatives below are the other tools in that job, ordered by their StackPick score. How we score.
Initial editorial estimate. Not a measured benchmark. Affiliate links may be used to monetize, but they never affect scores or rankings, and rankings are never sponsored.
Some links may earn us a commission. It never changes scores or order.
The tool
Best for TypeScript agents you keep in your repo
Ranked alternatives
02
CrewAI
Pick this if Role-based multi-agent prototypes in Python
Multi-agent crews: roles, tasks, and a Python API.
Free7.7
Visit03
Pydantic AI
Pick this if Typed Python agents
Python agent framework from the Pydantic team, typed end to end.
Free7.6
Visit04
LangGraph
Pick this if Agents that are workflows, not a single loop
Graph-shaped agents with state, from the LangChain team.
Free7.3
Visit05
LlamaIndex
Also known as GPT Index
Pick this if Retrieval over your own documents
A data framework for connecting documents and models.
Free7.0
Visit06
LangChain
Pick this if A general LLM app framework with a huge ecosystem
The original LLM application framework, plus a hosted LangSmith side.
Free6.7
Visit