Again, based on @FixedFun 's original designs so creds to them for the idea.
Thoughts about these ones? For the one on the right, I tried a different angle to hopefully give more bird and less bald man.
As an iOS app icon?
As an icon on the website definitely yes, and since it’s open source, maybe somebody will disagree with you.
I don’t know anything about iOS development. I know it’s possible to add pills to an icon if you have notifications, but I have no idea if iOS gives you the ability to change what the icon looks like. Because we’d be talking about a PWA, the tools may also be a little different.
As for browsers, I actually misremembered how favicons worked. After refreshing my memory, This is actually much less effort than I originally expected. Assuming an instance wanted to implement this, they could just change the link that defines the icon based on the currently logged in user’s number of notifications.