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I believe it's because both products appear to be using https://tailwindui.com/

One option to look for is https://volument.com which focuses on insights

I inadvertently clicked on the link. My first thought was "Did Plausible rebrand without telling me?"

Is plausible.io self hostable?

Yes: https://plausible.io/self-hosted-web-analytics

I don't know why you'd pick one over the other, I haven't looked that deeply into either. For all I know Umami is a fork of Plausible. If this is better than the commercial Plausible instances then Plausible can copy those features over with ease and vice versa. That's the power of open source!

Compare this to the self hosting guides on umami where they literally give you a one-click-deploy button. https://umami.is/docs/running-on-heroku

Umami wins hands down

Plausible is AGPL while Umami is MIT licensed.