It's advertised as a scanner but for me Stack was essentially a tag/label system on top of Google Drive, something I think is still sorely needed on Google Drive. Having the same document appear in multiple "stacks" (eg "ID" + "Immigration", "Medical" + "Insurance" + "Bills") regardless of their actual folder was a good organizational tool.

Google Drive already had a fairly capable scanner.

The strange thing is that the business/education editions of Google Drive support labels mostly for compliance reasons (integrates with data retention policies), but it's not available for personal Google accounts.

This was one of my favorite Google products. It worked exactly as advertised, no frills. Since its release, I haven't once needed to pull out my old Brother document scanner.

The maintenance burden for Stack cannot have been significant, and yet I guess I am unsurprised to see Google add another good app to their graveyard.

What do others use for this purpose?

GeniusScan is great: https://play.google.com/store/apps/details?id=com.thegrizzly...

Microsoft has a similar app: https://play.google.com/store/apps/details?id=com.microsoft....

As the post said, Google Drive also has this built in, but it's not very good IMO. Adobe and others also have their own.

I like Genius the most, personally, but there's really a bunch of them on the app store.