Diffchecker compares text, code, and data, either in a browser or with its desktop app.
Alternatives to GNU Diffutils
Code Compare is a file and folder comparison and merge tool available as a standalone app and a Visual Studio extension.
GNU Emacs is a free, extensible text editor built around an interpreter for Emacs Lisp.
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UltraCompare
LinuxmacOSWindows7.1From $8.33 a month - 5

Diffract
Diffract is a desktop tool for comparing code, folders, documents and binary files side by side on Linux, macOS and Windows.
Free planLinuxmacOSWindows6.8$34, paid once - 6
Beyond Compare
Beyond Compare is desktop software for comparing and synchronizing files and folders.
LinuxmacOSWindows6.4$35, paid once - 7
Beyond Compare
Beyond Compare helps users inspect differences and merge changes across folders, text files, images, and tables.
LinuxmacOSWindows6.4$35, paid once - 8

DeltaWalker
DeltaWalker is a desktop application for comparing, synchronizing, merging, automating, and analyzing files and folders on Windows, macOS, and Linux.
LinuxmacOSWindows6.4$39.99, paid once - 9

Altova DiffDog
Altova DiffDog is a Windows desktop tool for comparing and merging files, directories, and database schemas or content.
Windows6.3$189, paid once - 10

Araxis Merge
Araxis Merge is a Windows and macOS application for comparing and merging files, plus synchronizing directory trees.
macOSWindows6.3$129, paid once - 11
DiffMerge
DiffMerge is a desktop utility for comparing and merging files, as well as comparing and synchronizing folders.
LinuxmacOSWindows6.3$30, paid once - 12
Guiffy
Guiffy is a visual tool for comparing and merging source files and comparing folders, available for Linux, macOS, and Windows.
LinuxmacOSWindows6.3$24, paid once - 13
Kaleidoscope
macOS6.3From $0.67 a month - 14

DirEqual
DirEqual compares folders and files, then lets users synchronize folder contents on macOS or Windows.
macOSWindows6.2From $1.25 a month - 15

KDiff3
KDiff3 compares and merges files and folders on Linux, macOS, and Windows.
Free planLinuxmacOSWindows6.2Free plan - 16
Meld
Meld is a free visual diff and merge tool for comparing files, folders, and version-controlled projects.
Free planLinuxWindows6.2Free plan - 17
ExamDiff Pro
Windows6.1$37.99, paid once - 18
ExamXML
Windows6.1$39, paid once - 19
FolderMatch
Windows6.1$18, paid once - 20
Mergely
Mergely is a browser-based diff and merge editor, as well as a JavaScript library for comparing and merging text.
Free planWebAPISelf-hosted6.1Free plan - 21
AmSo Compare
AmSo Compare is a macOS application for comparing, editing, merging, and synchronizing folders and files.
macOS6.0From $1.08 a month - 22

Compare and Merge
Compare and Merge is a Windows application for comparing text files and folders, locating character-level changes, and merging selected differences.
Windows6.0$39.95, paid once - 236.0$29, paid once
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Diffinity
Diffinity is a free Windows utility for comparing and merging text files, with folder comparison for reviewing differences across directories.
Free planWindows5.9Free plan - 25
NextDiff
NextDiff is a Windows utility for comparing two files, text documents, source code files, or folders.
Free planWindows5.9Free plan - 26
Kompare
Kompare is a free Linux graphical application for viewing and merging differences between source files.
Free planLinux5.8Free plan - 27

WinMerge
WinMerge is a free, open-source Windows tool for comparing and merging files and folders.
Free planWindows5.8Free plan - 28
cwdiff
cwdiff is a command-line wrapper for wdiff that compares directories and displays differences in color.
Free planLinux5.7Free plan - 29
SmartSynchronize
SmartSynchronize is a file and directory comparison tool for comparing changes, merging edits, and synchronizing folder structures.
LinuxmacOSWindows5.4 - 30

P4Merge
LinuxmacOSWindows4.9
