the catalog · ✨ AI assistants
Mastra
★ 18kTypeScript agent framework from the Gatsby team — workflows, agents, RAG and evals with a local dev playground.
Mastra does the job of Vercel AI Cloud agents and Relevance AI, self-hosted. It is Apache-2.0-licensed, so you can do essentially what you like with it, and it installs in about one command. Vercel AI Cloud agents bills $50 for it. 18k stars on GitHub.
Open-source replacement for Vercel AI Cloud agents, Relevance AI.
- Licence
- Apache-2.0
- Self-hosting
- Easy
- The paid one costs
- $50
- GitHub stars
- 18k
Is it actually a replacement?
We have written a verdict on what it replaces — what you lose, and why people still pay:
How Mastra runs
Where it runs
Mastra runs on your server.
What setup takes
not verified by us yet — check the repo README.
Mastra questions
Is Mastra open source?
Yes — it is released under Apache-2.0.
Can Mastra replace Relevance AI?
Our verdict on Relevance AI is YES. AutoGPT (180k stars), Langflow (153k stars), n8n (130k stars) are mature open-source replacements for Relevance AI — self-host with docker and stop paying.
Can I self-host Mastra?
Yes — we rate it easy to self-host, and it runs on your server.