F-Droid

I turned on my old HTC espresso after a decade and I remembered that I loved this app.

It creates an unique profile image for contacts without a profile picture

So now when you open the contact list instead of having a list of capital letters in a circle you have a list of capital letters in a more colorful circle

Unfortunately it's now outdated and discontinued, but it still works on Android 14.

Seems like some asshole took the source code and republished the app as is, without credit, in the Amazon app store to get some financial incentive (around 2014 blackberry paid devs to republish their apps and many assholes decided that it was a good idea to "steal" open source apps)

After this, dev took development private but then got tired of the update treadmill that Google forces on the play store, so the apps were automatically delisted.

Luckily, fdroid doesn't have such artificial limitations on outdated apps that still work as intended.