Here’s my own side project that’s been earning a bit on the side:

I built DedupX, a macOS app for finding duplicate and visually similar files fast - especially useful for photographers and anyone with big local storage collections.

What it does

- Exact duplicate detection using incremental hashing so it doesn’t have to fully load huge files.

- Perceptual image matching finds similar images even if they’re resized or lightly edited (not just byte-for-byte duplicates).

- Native macOS integration with a Finder right-click scan.

Why I built it: My brother kept running out of space because of tons of photos, and every existing tool I tried either missed similar images or was slow and clunky - so I spent a couple of weekends building something that felt fast, accurate, and native.

Business side

- Free trial (no CC required).

- Paid tiers: ~$5.99/yr or ~$16.99 lifetime.

Got positive feedback and 100+ paying users shortly after launch. Been growing steadily ever since.

Link: https://maheepk.net/projects/dedupx/