How do solo iOS makers actually measure usage?

The App Store shows downloads, revenue, crashes. Fine as a pulse check. Not enough if you care what people do inside the app: which paywall they hit, whether they finish a session, whether a feature even got used.

For Briskly I built a small event tracker and a private dashboard for that. It works. I’m just not sure it’s the smartest use of solo time, or if there’s a simpler setup most people use.

If you’re shipping alone (or basically alone): what do you look at week to week? App Store numbers only, a third-party tool, or something you built yourself? What’s the least you need before the metrics actually change what you ship?