01
Mastra
Pick this if TypeScript agents you keep in your repo
TypeScript framework for agents, workflows, and evals.
Free
8.0
VisitAlternatives · Agent frameworks
Best Vercel AI SDK alternatives
Rankings as of
The Vercel AI SDK is an open-source TypeScript toolkit for building AI apps: streaming responses, tool calling, structured output, and UI hooks for React and other frameworks. It is provider-agnostic. It is the default harness in this directory for an indie web app that needs an assistant or a small agent.
Vercel AI SDK scores 8.5 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
8.5
VisitBest for Streaming AI features in a TypeScript web app
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