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Stories, guides, and updates from the team behind Dup.

How I Built a Duplicate Finder That Sees What Your Files Look Like

Most duplicate finders compare filenames and sizes. I built one that compares what files actually look like — and it found 47 GB of duplicates other apps missed.

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How to Find and Remove Duplicate Photos & Videos on Mac (2026)

Step-by-step guide to finding and removing duplicate photos and videos on Mac. Covers iCloud, HEIC, and tools that find similar files — not just exact copies.

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I Found 47 Duplicate Videos Other Apps Missed — Here's Why

I ran the same folder through 3 duplicate finders. Two found 3 duplicates. Dup found 47. Here's why the results were so different.

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Exact vs. Similar: How Duplicate Video Detection Actually Works (2026)

Most duplicate finders compare raw file data. Here's why that misses the majority of video duplicates, and what perceptual hashing does differently.

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