Czkawka is a free file-finding tool for locating duplicates, empty folders, and other unnecessary files.
Alternatives to DoubleKiller
jdupes is a free utility for locating and handling exact duplicate files on Linux, macOS, and Windows.
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Duplicate Files Fixer
Duplicate Files Fixer scans for duplicate photos, videos, music, documents, and other files, then lets you review and delete selected copies.
Free planAndroidmacOSWindows6.8From €35.95 a year - 5
Duplicate Photos Fixer Pro
Duplicate Photos Fixer Pro finds exact duplicate and similar-looking photos so you can review a library, remove unwanted copies, and recover storage.
AndroidiOSmacOSWindows6.7From $39.95 a year - 6

dupeGuru
dupeGuru is a desktop application for locating duplicate files on Windows, macOS, and Linux.
Free planLinuxmacOSWindows6.6Free plan - 7

Cisdem Duplicate Finder
Cisdem Duplicate Finder locates duplicate files and visually similar photos on macOS and Windows.
macOSWindows6.3From $19.99 a year - 8

Easy Duplicate Finder
macOSWindows6.3From $39.95 a year - 9

Duplicate File Detective
Windows6.2$30 one-time - 10
Anti-Twin
Anti-Twin is a free utility for locating duplicate and similar files.
Free planLinuxmacOSWindows6.0Free plan - 11

Duplicate Cleaner
Duplicate Cleaner finds duplicate files on Windows computers and network drives, including documents, photos, music and video.
Free planWindows6.0Free plan - 12
DupScout
Windows6.0$250 one-time - 13
EaseUS DupFiles Cleaner
EaseUS DupFiles Cleaner is a Windows utility for locating and reviewing duplicate files on selected folders and drives.
Free planWindows6.0From $59.95 a year - 14
fclones
fclones is a free, open-source command-line utility for finding identical files and handling unwanted copies.
Free planLinuxmacOSWindows6.0Free plan - 15
fdupes
fdupes is a free, open-source Linux utility that finds duplicate files in directories you specify and can delete selected copies.
Free planLinux6.0Free plan - 16
rdfind
rdfind is a free command-line tool that finds duplicate files by comparing their contents rather than relying on filenames.
Free planLinuxmacOSWindows6.0Free plan - 17

AllDup
AllDup is a Windows program for finding duplicate files and deciding what to do with them.
Free planWindows5.9Free plan - 18
CloneSpy
CloneSpy is a free Windows utility for finding and removing duplicate files to help reclaim hard drive space.
Free planWindows5.9Free plan - 19

Dup Detector
Dup Detector is a free, open-source desktop app for finding duplicate files and reclaiming drive space.
Free planLinuxmacOSWindows5.9Free plan - 20
rmlint
rmlint is a free, GPLv3-licensed utility for finding duplicate files and other filesystem waste, then offering candidates for removal.
Free planLinuxmacOSSelf-hosted5.9Free plan - 21
Tidy Up
macOS5.9$29.99 one-time - 22
Wise Duplicate Finder
Wise Duplicate Finder is a Windows utility for locating and deleting duplicate files in selected folders and disks.
Free planWindows5.9From $11.97 a year - 23
Ashisoft Duplicate File Finder
Ashisoft Duplicate File Finder is a Windows application for locating and cleaning up identical files.
Windows5.8From $39.95 a year - 24
dskDitto
dskDitto finds duplicate files across disks with parallel scanning and offers a terminal interface by default plus an optional, experimental graphical interface.
LinuxmacOS5.8 - 25
Gemini 2
macOS5.8 - 26
Duplicate Files Search & Link
Duplicate Files Search & Link is a free Windows utility that finds duplicate files through byte-by-byte content comparison, regardless of filename.
Free planWindows5.7Free plan - 27
Doppel
Doppel is associated with a repository now renamed File Foundry, whose release notes identify the published app as com.junowoz.filefoundry.
macOS5.6 - 28
DUDE (DUplicates DEtector)
DUDE (DUplicates DEtector) is a free desktop utility for finding duplicate files on Linux and Windows.
LinuxWindows5.5 - 29
dupeGuru
LinuxmacOSWindows4.7 - 30
DuplicateDuster
LinuxmacOSWindows4.7