Cisdem Duplicate Finder vs jdupes

Cisdem Duplicate Finder detects duplicate files and visually similar photos on macOS and Windows. It compares file contents rather than filenames, covering images, documents, songs, videos, archives, and duplicate folders. For photos, it can identify burst shots, edited or resized versions, and pictures taken from different angles or in different lighting. The maker says this photo analysis runs entirely on the device without uploading files to a cloud or server. Results can be previewed in three modes, then sorted, searched, and filtered. Users can remove duplicates permanently, move them to Recycle Bin or Trash, or place them in a selected folder. Supported locations and services include external drives and SD cards, iTunes and Apple Music, Mac Photos, OneDrive, Dropbox, Google Drive, and iCloud. The trial can scan, preview, locate, and hide duplicates, but cannot delete all selected duplicates with one click. One-time individual licenses cost $39.99 as a one-time purchase for one Mac or one PC; one-year subscriptions cost $19.99 a year. Business licenses cost $54.99 as a one-time purchase for one computer.

jdupes is a free utility for finding and handling exact duplicate files on Linux, macOS, and Windows. It identifies files that are fully identical rather than matching images, sounds, or other formats by similarity. Matching can use file size, hashes, and byte-for-byte comparison, with optional partial-hash matching. The project says it checks matching data after hashing to reduce the chance of false matches from hash collisions. Found duplicates can be reviewed before deletion, deleted without prompting, linked, summarized, or handled through copy-on-write deduplication. On Linux and Unix, the instructions use command-line directory paths; the project also provides a native Windows port, including support for Unicode. Docker use is documented, and standard output can feed shell scripts. A database can retain scan metadata for repeat runs, though the project labels that feature as under development and notes quirks. The README warns that quick matching skips byte-for-byte checks and can classify non-duplicates as duplicates. It also warns that disabling file-change checks creates a security vulnerability, especially when linking or deleting. jdupes is distributed under the MIT License.