I am a happy user of PhotoPrism. I use it with Podman. I initially hated the fact that it requires containers but then I realized this makes it much easier to w

I am a happy user of PhotoPrism. I use it with Podman. I initially hated the fact that it requires containers but then I realized this makes it much easier to work with multiple libraries simultaneously which was mentioned by OP. The Photos app on the Mac does not allow using multiple libraries simultaneously; I believe it needs to be restarted to switch libraries.