Mastra in 2026: What It Is, When to Use It, and How It Compares

Mastra: mastra.ai | GitHub | Docs My project: Hermes IDE | GitHub Me: gabrielanhaia The team that built Gatsby.js pivoted to AI agents. They raised $13M from Y Combinator, and their framework already has 22k+ GitHub stars with over 300k weekly npm downloads. If you write TypeScript and you're building anything with LLMs, you should probably know what Mastra is. I've been working on Hermes IDE (GitHub), an AI-powered development tool, and evaluating frameworks is something I end up doing more often than I'd like. Most of them waste your time in the first 15 minutes. Mastra didn't. That's what got my attention. I spent a few days reading the docs, running the code, and stacking it against what else is out there. This is what I'd tell a teammate who asked me "should we use Mastra?" What Is Mastra, Actually? Mastra is an open-source TypeScript framework for building AI agents, workflows, and RAG pipelines. Apache 2.0 license. Built by Kepler Software (Sam Bhagwat, Abhi Aiyer, Shane Thomas,