What is Dup used for?

Dup is a Mac app that finds duplicate and visually similar photos and videos across folders, iCloud and external drives, even when formats or file names differ. It is a good fit for freeing disk space on a crowded Mac and cleaning up copies of videos in different resolutions.

How much does Dup cost?

Paid plans for Dup start at $29.99 per year, and there is no free plan. A free trial is available.

No. Dup is proprietary (closed-source) software. In the Photos & Images category, open-source options include Immich, PhotoPrism and Ente.

What are some alternatives to Dup?

Dup competes with Dusty, Cleaner and Cleaner AI.

Dup: features, pricing and alternatives

About Dup

Dup is a proprietary utility for finding duplicate and near-duplicate photos and videos. Instead of matching only identical files, it compares what the images and clips look like, so a high-resolution original and a compressed copy, or a HEIC photo and its JPG export, can be grouped together. The App Store listing says it is for Mac, although the product tagline describes iPhone photo libraries.

It can scan iCloud Drive, a Photos library, Google Drive, any folder and external or USB storage, then show each duplicate group with sizes and paths and a side-by-side comparison. A Smart Auto-Keep option suggests which copy to retain by weighing quality, resolution and date, video matching works across codecs, resolutions and containers, and a Forgotten Files feature surfaces large files that have not been opened for months.

Dup is a commercial app distributed through the Mac App Store as a free download with in-app purchases. The listing says deleting up to 250 MB of duplicates is available without the Pro upgrade, and that processing stays private on the Mac.

Key features

Visual matching of similar photos and videos
Scans iCloud Drive, Photos Library and Google Drive
Side-by-side comparison of duplicate groups
Smart Auto-Keep suggests which copy to retain
Matches across formats such as HEIC and JPG
Finds large files not opened in months

Good fit for

→Freeing disk space on a crowded Mac
→Cleaning up copies of videos in different resolutions

Tags: duplicate-finder; photos; storage-cleanup; macos; videos; utilities; disk-space

Dup: questions and answers

What is Dup used for?: Dup is a Mac app that finds duplicate and visually similar photos and videos across folders, iCloud and external drives, even when formats or file names differ. It is a good fit for freeing disk space on a crowded Mac and cleaning up copies of videos in different resolutions.
How much does Dup cost?: Paid plans for Dup start at $29.99 per year, and there is no free plan. A free trial is available.
Is Dup open source?: No. Dup is proprietary (closed-source) software. In the Photos & Images category, open-source options include Immich, PhotoPrism and Ente.
What are some alternatives to Dup?: Dup competes with Dusty, Cleaner and Cleaner AI.