Google Stack is a document management app created by Area 120. The app currently works on Android phones and tablets in the US.

What Was Google Stack? Google Stack was a document-scanning and -filing app. It digitally photographed and stored receipts, bills, and other papers as PDFs, organizing them into different categories.

Google Photos recently introduced Photo Stacks, a feature that automatically groups similar photos to keep your library organised, here's how to use it.

So, Android users will have to wait just a bit longer for it. Google’s AI is pretty impressive, so it can successfully add similar-looking photos to Stacks. However, it’s not perfect.