M 
Mastra
A TypeScript agent framework with workflows, memory and evals built in.
NOT REALLY
why this verdict
Keep it — OpenAI has not replaced it
OpenAI's version overlaps, but does not finish the dev tools job, so this one is still worth keeping open.
- A named launch, not a vibe named, unlinked
- Python agent frameworks dominate the ecosystem. OpenAI, April 1, 2025 — no announcement link recorded yet.
- How much of the job it covers not the job editorial call
- Parts of it. The job still needs the tool to get finished.
- Is there a free way to do it? yes
- 2 of 2 listed replacements have a usable free tier: Vercel AI SDK and LangGraph.
- What the call is worth nothing to cancel
- No paid entry tier tracked, so there is no subscription to cancel.
Reason composed from the fields above missing: announcement linked recorded: free replacement listed recorded: two or more escape hatches
- Threatened by
- OpenAI
- Since
- April 1, 2025
- List price
- free
- Per year
- —
The backstory
Mastra came from the Gatsby team and filled an obvious gap: almost every agent framework was Python, while almost every product engineer shipping AI features was writing TypeScript. Typed workflows, durable steps and built-in evals make it feel like a framework rather than a notebook.
Escape hatches
V 
Vercel AI SDK Lighter, less opinionated.
ai-sdk.dev open_in_new L 
LangGraph More mature, Python-first.
langchain.com open_in_new2 of 2 replacements have a usable free tier.
