DoubleKiller vs dskDitto

DoubleKiller is a Windows utility that finds duplicate files in directories, on complete drives or on computers in Network Neighborhood. It can compare files using any combination of name, size, modification date and content. Scans can exclude files by name, type, attributes or size, and the results list lets users choose files to delete or move to another directory. Results can also be exported to a text file. The program is a standalone executable that can be extracted and run without installation; its maker says it does not change the system without prior permission. The free version is for private use and allows unlimited folder and file counts, but individual files are limited to 2 GB and commercial use is not permitted. DoubleKiller Pro adds a multilingual interface, advanced comparison options, saved and reloadable result lists, and command-line automation. The download page lists version 1.6.2.82 dated 2007-07-07, and the maker says development is paused. The listed paid starting price is $19.95 one-time.

dskDitto is a duplicate-file detector for Linux and macOS with a terminal interface by default and an optional experimental Raylib graphical interface. It scans local filesystem paths and directories using parallel processing, with optional virtual filesystem directories. Matching can use SHA-256, BLAKE3, exact filenames, or fuzzy content similarity; fuzzy mode starts at a 75% similarity threshold and disables automatic removal and link actions. Scan filters cover file size, directory depth, hidden files, symlinks, virtual filesystems, and filesystem boundaries. You can preview files, exclude folders, and use automatic selection. Results export to CSV, JSON, or plain text. With the explicit remove option, extra copies can be deleted or replaced by symlinks or reflinks. Reflinks require supported copy-on-write filesystems such as APFS, Btrfs, or XFS with reflink enabled. Source installation requires Go 1.22 or later; GUI builds also require Raylib and CGo. The project is free and released under the Apache license.