Mastra

AI Agents

Mastra

FreemiumOpen Source

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Open-source TypeScript agent framework: agents, workflows, memory, RAG and evals in one stack, with an interactive playground and Mastra Cloud deployment

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Our Verdict

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The default agent stack for TypeScript teams

For years, JavaScript developers building agents had to glue together ports of Python libraries. Mastra changed that: one TypeScript-native stack with agents, workflows, memory, RAG and evals that feels like it was designed — because it was — by people who understand JS tooling. It is younger than LangGraph and its APIs still move fast, but if your product lives in Next.js or Node, starting anywhere else now needs justification.

Best for

•TypeScript/JavaScript product teams building AI features
•Next.js and Node.js apps needing agents plus RAG
•Developers who want a playground-driven iteration loop

Consider alternatives if

•Your team is Python-first (→ LangGraph, Pydantic AI)
•You prefer visual no-code building (→ Flowise, Dify)

Try Mastra

Supported Platforms

Web AppWindowsmacOSLinuxAPI

Available platforms include Web App, Windows, macOS, Linux, and API.

Key Features

Agents, workflows, memory, RAG and evals in one TypeScript stack

Suspend/resume workflows with branching and human input steps

Interactive local playground to chat with agents while developing

Model routing to 40+ providers via the AI SDK

Mastra Cloud for hosted deployment, plus deploy anywhere Node.js runs

Built by the founding team of Gatsby, with MCP support

Pricing

free

Open-source framework is free: build and self-host agents anywhere Node.js runs, paying only your LLM providers

paid

Mastra Cloud hosted deployment with tiered plans; team and enterprise pricing published on the official site

Use Cases

TypeScript product teams adding agents to Next.js and Node apps

Full-stack AI features combining workflows, memory and RAG

Rapid agent prototyping with the local playground

Deploying agent services alongside existing JS infrastructure

Pros

Best-in-class developer experience for TypeScript AI

One coherent stack instead of stitching together five libraries

Local playground makes iteration genuinely fast

Strong momentum: YC-backed with a fast-growing community

Cons

Younger than Python rivals — fewer battle scars in production

TypeScript only; Python teams must look elsewhere

APIs still evolve quickly between releases

Third-party integration catalog smaller than LangChain's

Latest Update

2026: Mastra consolidates its position as the leading TypeScript agent framework, expanding workspaces, streaming and Mastra Cloud while the JS AI ecosystem rallies around it