Mastra

Mastra is an open-source TypeScript framework for building production-ready AI agents, agentic workflows, and RAG pipelines. Created by the team behind Gatsby (Sam Bhagwat CEO, Abhi Aiyer CTO, Shane Thomas CPO), it graduated from Y Combinator's Winter 2025 batch with $13M in funding. The framework reached v1.0 in January 2026 and has 26.1k GitHub stars and 300k+ weekly npm downloads as of Q3 2026. Mastra fills a gap in the agent ecosystem: LangChain, CrewAI, and AutoGen began in Python with later JavaScript ports, while Mastra was designed from the ground up for TypeScript. The framework provides core primitives for agent development. Agents are autonomous LLM-driven decision makers. Tools provide typed external integrations via Zod schemas. Workflows enable deterministic multi-step pipelines. Additional built-in capabilities include memory systems, MCP server support, RAG with vector database management, supervisor patterns for multi-agent orchestration, evals, observability, and Mastra Studio (a visual IDE for testing and debugging). The model router connects to models from 40+ providers (OpenAI, Anthropic, Google Gemini, DeepSeek, Groq, Mistral, xAI Grok, Amazon Bedrock, Azure OpenAI, Ollama, OpenRouter, Vercel, Hugging Face, Cohere, Cerebras, and more) through one standard interface with automatic fallbacks and IDE autocomplete. Production users include Replit (Mastra powers Replit Agent's agent builder), Factorial, Counsel Health, Cedar, and SoftBank. Pricing: the core framework is open source under Apache 2.0 and free for any use. Enterprise features (RBAC, SSO, ACL) reside in the ee/ directory and require a commercial license for production use but are freely usable for development and testing. Mastra Cloud is a hosted platform with GitHub-connected deployments, autoscaling, instant rollbacks, and centralized observability. Starter is free at $0/month (100K observability events, 24 CPU hours, 15 days data retention). Teams is $250/month (1M events, 250 CPU hours, 6 months retention, multiple teams, SSO, SOC 2 docs). Enterprise is custom pricing (custom volume and retention, RBAC, audit logs, support and uptime SLAs, dedicated support engineer). Self-hosted deployment is available at no cost. Best fit: TypeScript and JavaScript developers building production AI agents without learning Python, full-stack web teams adding agentic features to Next.js, React, Express, or Hono apps, and platform companies (like Replit) embedding agent infrastructure into their own products. Who Mastra is not for: Python-only shops or teams committed to LangChain and CrewAI Python workflows cannot use Mastra without rewriting in TypeScript. Teams needing turn-key no-code agent builders should consider Botpress, Voiceflow, or Microsoft Copilot Studio instead. Enterprise compliance documentation (SOC 2, ISO 27001) is available on the Teams and Enterprise Mastra Cloud tiers, not the free tier.