

I don’t know of a service that tracks all major repositories to calculate a single popularity index. They are not really comparable to each other anyway.
Depending on what type of application you search for, I think “Flathub” could be one major source. It’s a pretty popular “platform” and not dependent on a certain distribution. There are “Trending” and “Popular” categories too. It’s excellent to find some new software (or to remind an older one exist) in my opinion. You don’t even need to install the Flatpak and can do it from Archlinux repositories (or the AUR if you prefer).
In other words, the specs are vibe coded and then this vibe coded spec is used to vibe code a program. How exciting.