Agent frameworks · ranked 02
Mastra
TypeScript framework for agents, workflows, and evals.
Best for TypeScript agents you keep in your repo
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.
Best use cases
- Agents inside a TypeScript product
- Workflows with tools and evals
- A step up from a single AI SDK route handler
Pros
- + TypeScript-native, which matches most indie web stacks
- + Open source
- + Agents, workflows, and evals are the product, not an afterthought
Cons
- − Another framework to learn if the AI SDK already covers the feature
- − Hosted pieces, if you use them: check site
Pricing
The framework is open source. Any hosted offering: check site.
Alternatives
Agent frameworks
8.5
Vercel AI SDK
TypeScript toolkit for streaming, tool calls, and chat UI.
Best for Streaming AI features in a TypeScript web app
Agent frameworks
7.3
LangGraph
Graph-shaped agents with state, from the LangChain team.
Best for Agents that are workflows, not a single loop
Agent frameworks
7.6
Pydantic AI
Python agent framework from the Pydantic team, typed end to end.
Best for Typed Python agents