From Umami’s About page:
Umami is a simple, easy to use, self-hosted web analytics solution. The goal is to provide you with a friendlier, privacy-focused alternative to Google Analytics and a free, open-sourced alternative to paid solutions. Umami collects only the metrics you care about and everything fits on a single page.
Here on Initial Charge, I don’t plan on switching from WordPress.com’s stats through Jetpack. But if I was looking elsewhere, Umami looks like a nice option.