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![JafarNajafov Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::73847343.png) Jafar Najafov [@JafarNajafov](/creator/twitter/JafarNajafov) on x 58.4K followers
Created: 2025-07-21 09:00:51 UTC

X. Vellum

this is what you use when your AI agents actually have to work… in prod.

built-in evals, test-case banks, version control. you can switch between visual and code instantly.

feels like the Datadog of prompt engineering. free trial, but pricing is custom.

![](https://pbs.twimg.com/media/GwXqd29bYAEiwpv.png)

XXX engagements

![Engagements Line Chart](https://lunarcrush.com/gi/w:600/p:tweet::1947220214946676788/c:line.svg)

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[Post Link](https://x.com/JafarNajafov/status/1947220214946676788)