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AI Agents🔴Developer
M

Mastra

TypeScript-native framework for building AI agents, workflows, and RAG pipelines — from the team behind Gatsby.js.

Starting atFree
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💡

In Plain English

Mastra is a TypeScript framework for shipping AI agents, deterministic workflows, RAG, and memory inside any Node, Next.js, Cloudflare, or Vercel app — with a local playground that traces every run.

OverviewFeaturesPricingUse CasesIntegrationsLimitationsFAQAlternatives

Overview

Mastra is the TypeScript answer to CrewAI and LangChain: a batteries-included framework for shipping agents, deterministic workflows, evaluations, and RAG inside a Node, Next.js, Cloudflare, or Vercel app. Built by the team behind Gatsby.js, Mastra gives JavaScript engineers typed agent definitions, durable workflows with retries and HITL steps, memory backed by Postgres or LibSQL, and first-class RAG utilities. Mastra is MCP-native both ways — your agents can call any MCP server and your workflows can be exposed as MCP servers.

🎨

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Editorial Review

Mastra is best for TypeScript teams that want open-source agent infrastructure with hosted observability, evals, memory, workflows, and deployment without giving up code-level control.

Key Features

Local dev playground: `mastra dev` opens a browser UI that shows every agent execution, workflow trace, RAG retrieval, and eval result in real time as you save TypeScript files — the best dev loop in the agent framework space.+
Deterministic workflows: a separate primitive from agents, modeled as a typed DAG with retries, conditionals, parallel branches, and explicit HITL pauses — ideal for production processes where unpredictability is a bug, not a feature.+
RAG primitives: built-in chunking strategies (recursive, markdown-aware, code-aware), pluggable embedding providers, vector store adapters for Postgres pgvector and LibSQL, and re-ranking hooks.+
Bi-directional MCP: agents can pull tools from any MCP server, and your Mastra app can be exposed as an MCP server so Claude Desktop or Cursor can drive your custom business logic.+
Zod everywhere: tool inputs, agent outputs, and workflow steps are all schema-validated, giving you compile-time guarantees rare in agent frameworks.+
Y Combinator-backed (S24) by Gatsby founders, with active hiring and weekly releases.+

Pricing Plans

Open Source

$0

  • ✓Full framework
  • ✓Local playground

Mastra Cloud

Preview

  • ✓Hosted runtime
  • ✓Team features
See Full Pricing →Free vs Paid →Is it worth it? →

Ready to get started with Mastra?

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Best Use Cases

🎯

Adding agents to existing Next.js or Node apps

⚡

Durable workflows with human-in-the-loop approval

🔧

Production RAG over private knowledge bases

🚀

Exposing internal workflows to MCP clients like Cursor

Integration Ecosystem

2 integrations

Mastra works with these platforms and services:

💬 Communication
Email
🔗 Other
api
View full Integration Matrix →

Limitations & What It Can't Do

We believe in transparent reviews. Here's what Mastra doesn't handle well:

  • ⚠Not a no-code builder; implementation requires TypeScript and backend engineering skill
  • ⚠Published pricing should be rechecked before procurement because usage meters can change
  • ⚠MCP support is described through Mastra primitives and materials, but exact client/server coverage should be verified for the target architecture
  • ⚠Hosted production use requires monitoring overage meters, especially event volume, CPU hours, retrieval storage, and persistent server needs

Pros & Cons

✓ Pros

  • ✓Best-in-class developer experience — the local playground is genuinely delightful
  • ✓Type safety end-to-end via Zod schemas, rare in agent frameworks
  • ✓MCP-native in both directions out of the box
  • ✓Runs on Cloudflare Workers and Vercel Edge — not Node-only
  • ✓Free and open source (MIT) with active backing from a credible founding team
  • ✓Avoids the Python context switch for TypeScript-heavy teams

✗ Cons

  • ✗Younger ecosystem than CrewAI or LangChain — fewer community integrations
  • ✗Mastra Cloud is still in preview with no public pricing yet
  • ✗Smaller pool of example crews/templates compared to Python frameworks
  • ✗Some advanced RAG features (multi-modal, hybrid search) still in beta

Frequently Asked Questions

Why choose Mastra over LangChain.js?+

Mastra is TypeScript-native with better type safety and developer experience — LangChain.js is a port from Python. Mastra's graph-based workflow engine, Zod-typed tools, and MCP authoring are more integrated. LangChain has a larger ecosystem of pre-built integrations.

Can I deploy Mastra agents to serverless platforms?+

Yes. Mastra agents deploy to Vercel, Cloudflare Workers, AWS Lambda, and any Node.js hosting environment. The cloud platform adds GitHub-based automatic deployments with rollbacks and autoscaling.

Does Mastra support MCP?+

Yes. Mastra includes full MCP server authoring, letting you expose agents, tools, and structured resources as MCP servers that work with Claude Desktop and other MCP clients.

What vector databases does Mastra support?+

Mastra integrates with Pinecone, pgvector, and other vector stores for RAG applications. The framework uses a pluggable architecture, so additional providers can be added.

Is Mastra free?+

The core framework is free and open-source under Apache 2.0. Mastra Platform (cloud hosting, observability, team features) will have separate pricing launching Q1 2026. Custom support and on-prem deployments are available via sales.
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Alternatives to Mastra

CrewAI

AI Agents

Open-source Python framework for orchestrating role-playing, autonomous AI agents that collaborate as a 'crew' to complete complex tasks.

LangGraph

AI agent framework

LangGraph is LangChain's open-source framework for building stateful, durable, multi-agent workflows in Python and JavaScript with graph-based control flow.

OpenAI Agents SDK

AI Agent Builders

OpenAI Agents SDK is an open-source Python framework for building agentic apps with handoffs, guardrails, sessions, tracing, MCP tools, sandbox agents, and realtime voice agents.

LlamaIndex

AI agent framework

LlamaIndex is an open-source Python and TypeScript framework for building RAG, document workflows, and AI agents — with LlamaCloud for managed parsing, extraction, and indexing.

Pydantic AI

AI agent framework

Pydantic AI is a Python GenAI agent framework from the Pydantic ecosystem, designed for typed, validated agent development alongside Pydantic and Logfire.

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User Reviews

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Quick Info

Category

AI Agents

Website

mastra.ai
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