Blog
Stories, guides, and updates from the team behind Dup.
Dup 2.1: Smart Auto-Keep, Cross-Format Matching, and Photo Quality Ratings
Dup now picks which duplicate to keep for you, finds duplicates across HEIC/JPG and MOV/MP4, and rates every photo for quality. Plus faster scanning and improved face detection.
Read more →How to Delete Every Photo of Someone on Mac — Without Scrolling Through Thousands
Use on-device face detection to find and delete every photo & video of a specific person on your Mac. No cloud uploads, no manual scrolling.
Read more →How to Clean Xcode DerivedData and Dev Caches on Mac (2026)
Xcode DerivedData, node_modules, Cargo targets, and pip caches silently eat your SSD. Here's how to find and clean them safely.
Read more →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.
Read more →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.
Read more →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.
Read more →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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