Agent Frameworks (Developers)free

Mastra

Open-source TypeScript framework (Apache 2.0) for agents, workflows and RAG

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What Mastra does

  • Open-source TypeScript framework (Apache 2.0) for agents, workflows and RAG
  • Drops directly into existing React/Next.js apps or runs standalone
  • Built-in workflow engine with suspend/resume and human-in-the-loop steps

Mastra — straight answers

What is Mastra?

Mastra is listed under Agent Frameworks (Developers), in the AI Agents & Automation category on Flocci AI Tools. Open-source TypeScript framework (Apache 2.0) for agents, workflows and RAG. It is free, with no paid plan attached, and it lives at mastra.ai.

Is Mastra free?

Mastra is listed as fully free — there is no paid tier attached to it in the catalog. That makes it one of the 115 entries on Flocci AI Tools with no upgrade path built in.

What can Mastra do?

Mastra does 3 things the catalog singles out: Open-source typescript framework (apache 2.0) for agents, workflows and rag; drops directly into existing react/next.js apps or runs standalone; built-in workflow engine with suspend/resume and human-in-the-loop steps.

What is the best free alternative to Mastra?

Agno is the closest free alternative: it sits in the same Agent Frameworks (Developers) sub-category and is free. AWS Strands Agents, DSPy and Google Agent Development Kit (ADK) also start free. The full list is on the alternatives page.

See the full list →

Mastra alternatives

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LangGraph

Agent Frameworks (Developers)
free
  • Build stateful, multi-agent apps as graphs
  • Human-in-the-loop and durable execution
  • Works with any LLM
  • Open-source with a hosted platform
Visit

CrewAI

Agent Frameworks (Developers)
freemium
  • Role-based multi-agent 'crews'
  • Simple Python API for collaboration
  • Tasks, tools and flows
  • Open-source core
Visit

OpenAI Agents SDK

Agent Frameworks (Developers)
free
  • Lightweight agent orchestration from OpenAI
  • Agent handoffs, guardrails and tracing
  • Tool and function calling built in
  • Open-source, pay only for model usage
Visit

Microsoft AutoGen

Agent Frameworks (Developers)
free
  • Multi-agent conversation framework
  • Event-driven, async agent design
  • Studio UI for prototyping
  • Fully open-source
Visit

LlamaIndex

Agent Frameworks (Developers)
freemium
  • Leading framework for RAG and data agents
  • Connect LLMs to your documents & APIs
  • Agentic document workflows
  • Open-source with a hosted cloud
Visit

Google Agent Development Kit (ADK)

Agent Frameworks (Developers)
free
  • Open-source Python/Java framework from Google for building multi-agent systems
  • Native integration with Vertex AI Agent Engine and Gemini models
  • Model-agnostic — works with non-Google LLMs via LiteLLM
Visit

Head-to-head comparisons

Mastra vs LangGraphMastra vs CrewAIMastra vs OpenAI Agents SDKMastra vs Microsoft AutoGenMastra vs LlamaIndexMastra vs Google Agent Development Kit (ADK)