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Indeed, it was bought then shut down. As someone also working in the scheduling space, they seemed like a competitor but it turns out their service wasn't as good as they hyped.

I wonder why Elon didn't use his x.com domain though, it's still sitting there.

https://www.bizzabo.com/blog/xai-sunset

From the page:

Relation to X Corp We are a separate company from X Corp, but will work closely with X (Twitter), Tesla, and other companies to make progress towards our mission.

Yeah but the x.com domain still doesn't have any info on it as one would expect from a marketing page.

Good memory, x.ai indeed was a calendar bot in place of a virtual assistant before chatbots were a thing.

Yup. https://news.ycombinator.com/from?site=x.ai