Launched this week
Dup
Find duplicate photos & videos other apps miss
4 followers
Find duplicate photos & videos other apps miss
4 followers
Most duplicate finders only catch exact copies. But real duplicates aren't exact — same photo as HEIC and JPG, same video at 4K and 1080p, same file renamed. Dup compares what your files actually look like. It found 47 duplicate videos that 3 other apps missed on the same folder. Drop a folder. See your duplicates. Delete with one click. 100% private — runs on your Mac, nothing uploaded. Free to use.
Nice work! Curious about Smart Select. How are you determining which file to keep in each duplicate group? Perceptual hashing, metadata comparison, or something else?
I'm building something similar for iOS photos and the "pick the best one" logic is the hardest part to get right. Especially when two files look identical but differ in resolution or compression.
@krisba95 Great question! Smart Select uses a combination of signals to rank files within each duplicate group — things like file size, resolution, and recency — weighted so you keep the "best" version without having to decide manually.
The perceptual hashing is used for detection (finding what's similar), but the "which one to keep"
ranking is a separate layer on top of that. The tricky part you're describing — identical-looking
files at different resolutions or compression — is exactly where naive approaches break down. We
treat higher resolution + larger file size as a strong signal for "original", but there are edge
cases (re-encoded at higher bitrate, etc.) where that heuristic fails and we fall back to recency.
For iOS photos specifically, you also have the HEIC vs JPEG variant problem which adds another
wrinkle. Would love to compare notes — what signals are you finding most reliable?