I’m canceling my Gemini sub and evaluating DupeGuru and rmlint:

1. https://dupeguru.voltaicideas.net
2. https://rmlint.readthedocs.io/en/master/tutorial.html

Both available for macOS via brew.sh.

Tested DupeGuru a bit and it’s already better than Gemini: it can detect duplicates nested in subfolders.