Mastra

Emerging

Open-source TypeScript AI agent framework from ex-Gatsby team. 22K+ GitHub stars, 300K weekly npm downloads; used by Replit, Marsh McLennan, and SoftBank.

Updated April 2026

Company Overview

Mastra is an open-source TypeScript framework for building AI agents and applications, created by the team behind Gatsby.js. With $13M from Y Combinator, 22K+ GitHub stars, and 300K weekly npm downloads, it is used in production by Replit, Marsh McLennan, and SoftBank.

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Emerging Innovator

Mastra is an emerging player bringing innovative solutions to the developer tools market.

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