Difftastic is a diff tool that compares files based on their syntax. It supports over 20 programming languages and when it works, it's fantastic.

The best open source alternative to Diffchecker is WinMerge. If that doesn't suit you, our users have ranked more than 50 alternatives to Diffchecker and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Diffchecker are Meld, KDiff3, ForskScope and Compare.
Difftastic is a diff tool that compares files based on their syntax. It supports over 20 programming languages and when it works, it's fantastic.

Visualize folders side-by-side and find immediately which files are different, colors help to understand the diff type. Colors identify older, modified and newer files.




WinMerge JP is a fork of the original WinMerge, but after 2018 the two are nearly identical. WinMerge JP's features including 3-way compare has been merged into the original.


Diff Match Patch is a high-performance library in multiple languages that manipulates plain text.
diffoscope tries to get to the bottom of what makes files or directories different. It will recursively unpack archives of many kinds and transform various binary formats into more human-readable form to compare them.
tkdiff is a graphical diff viewer based on the Tk framework. It is capable of inter-operating with source-control systems like CVS and Subversion to show differences between a local copy and a repository version.


xxdiff is a QT based graphical file and directories comparator and merge tool. It provides comparing two files, three files.


