I ran GA and Umami side by side for a month. GA was missing half my visitors.

I didn't switch off Google Analytics because of privacy principles. I switched because the numbers stopped making sense. A post I wrote got popular, and a friend texted me saying it was getting passed around. I opened GA and saw a modest uptick. Nothing dramatic. But comments kept coming in, people kept mentioning it. Something felt off. So I did something I should have done a long time ago: I installed a second analytics tool and ran them both simultaneously. For a month, Umami and Google Analytics ran on the same site, tracking the same pages. At the end I compared them. GA showed about 40% fewer visitors. Not a rounding error. Not a misconfiguration. Just... gone. The gap was biggest on posts that did well on Hacker News or got shared in developer circles. Which makes sense once you think about it — that audience runs uBlock Origin the way most people run antivirus. It's just on. Always. And GA is one of the first things it kills. That was the moment I stopped treating this as a pri