Mac用ベスト重複写真ファインダー：本当の比較方法

Any tool can find byte-identical files, that part is trivial. The real test is what happens with images that are visually the same but technically different files: a re-export at a smaller size, a version that went through a messaging app and got recompressed, or the next frame in a burst.

Vision AI: Photo Cleaner uses Apple's on-device vision technology to detect these near-duplicates, not just exact file matches, which is where most of the real disk space actually lives.

Photo libraries differ. A wedding photographer's near-identical bracketed shots need a tighter threshold than a casual phone library full of screenshots and memes. A finder that does not let you adjust how close two photos need to be before they are grouped will either over-group unrelated photos or miss obvious near-duplicates.

A similarity slider, plus a side-by-side comparison view with synchronized zoom, is what makes the difference between trusting the suggestions and re-checking every single group by hand.

The best duplicate finder is not the one that deletes fastest. It is the one that never lets a group disappear entirely: one copy is always kept and marked as the best, file size and date are shown per group, and nothing happens until you confirm.