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So is it 200M (daily, monthly) active users, all time users? but I assume it's the number of users since the launch of the app.

If you are interested in trying out an alternative, please let me know.

I would, we run 2 128gb enterprise algolia clusters at significant cost, 200 million documents

You should maybe take a look at Coveo

Mind if I reached out to you to chat about your experience in running search at scale? How do I contact you?

Please take a look at https://searchera.io for a demo. My personal email is on my profile.

Running an alternative solution with similar availability, performance and relevance will in most cases be substantially more expensive though. It really depends on your use case.