Mastra AI

Free

a framework for building AI-powered applications and agents with a modern TypeScript stack.

FreeFree tier

Type

Open Source

Visit Website GitHub (40 stars)

About Mastra AI

Mastra is an open-source TypeScript framework designed for building AI-powered applications and agents. It provides a comprehensive set of tools for developing reliable AI products, including model routing to over 40 LLM providers, autonomous agents that reason and use tools, a graph-based workflow engine for explicit control flow, human-in-the-loop capabilities for pausing and resuming execution, and built-in context management with conversation history, data retrieval, and observational memory. Mastra integrates seamlessly with popular frontend and backend frameworks like React, Next.js, and Node, and can be deployed as a standalone server, making it suitable for projects from early prototypes to production-scale applications.

Key Features

Model routing to over 40 LLM providers through a standard interface

Autonomous agents that reason, use tools, and iterate to solve tasks

Graph-based workflow engine with .then(), .branch(), .parallel() syntax

Human-in-the-loop suspension and resume with execution state persistence

Context management with conversation history, data retrieval, and observational memory

Integrations bundling agents and workflows with external services

Support for frontend/backend frameworks (React, Next.js, Node) and standalone deployment

Built-in storage for pausing execution indefinitely

Pros & Cons

Pros

TypeScript-native, leveraging modern JavaScript ecosystem
Supports over 40 LLM providers through a unified interface
Offers both autonomous agents and explicit workflow control
Human-in-the-loop enables safe and interactive AI processes
Comprehensive context management for coherent agent behavior
Open source with active community and frequent updates
Integrates easily with popular frontend and backend frameworks

Cons

Requires TypeScript knowledge, limiting non-JS developers
May have a learning curve for configuring complex workflows
Documentation depth may vary as project is relatively new
Dependency on third-party LLM providers may incur costs

Best For

Building conversational AI agents with autonomous reasoningOrchestrating multi-step AI workflows with branching and parallel executionDeveloping AI-powered applications that require user approval or input mid-processCreating context-aware AI systems with memory and data retrievalPrototyping and scaling AI products from idea to productionIntegrating AI capabilities into existing TypeScript codebases

FAQ

What is Mastra?

Mastra is an open-source TypeScript framework for building AI-powered applications and agents. It provides tools for model routing, autonomous agents, workflows, human-in-the-loop, and context management.

What LLM providers does Mastra support?

Mastra supports model routing to over 40 providers through a standard interface, including OpenAI, Anthropic, Gemini, and more.

Can Mastra be used with React or Next.js?

Yes, Mastra integrates with frontend and backend frameworks like React, Next.js, and Node, and can also be deployed as a standalone server.

Does Mastra support human-in-the-loop workflows?

Yes, Mastra allows suspending an agent or workflow to await user input or approval, and can resume from the same point using stored execution state.

Is Mastra free to use?

Mastra is open source and free to use. However, using third-party LLM providers may have their own costs.