Find the one line that broke it.

Diffy compares text, XML and images side by side, lets you merge hunk by hunk, and edits both panes live. It was built against USSD-browser VXML exports — 40,000 lines on one line, sometimes UTF-16, often with Urdu in the middle — so a normal config file is a holiday.

One email when it ships. No date announced yet.

Both are the same portable executable. Merging, hunk take/skip and undo unlock with a licence key; nothing else is held back.

Compare

Original against Modified, side by side or unified. Syntax highlighting for XML/VXML, PHP, JS/TS, C#, Python, SQL, CSS and JSON. Line-number gutters with change marks, a minimap, prev/next navigation, per-hunk Take ← / Take → / Skip with undo and redo, editable panes that re-diff as you type, and a status bar carrying encoding, line endings and the change count.

Reader

A multi-tab viewer and editor for one file at a time: outline tree, find and replace, column selection, rendered Markdown and HTML, native PDF viewing, per-tab zoom. Both screens share the light and dark theme and remember your session.

Also a command-line tool

Exit code 0 identical, 1 different, 2 error. Emit a unified patch or a self-contained HTML report. Register it as Git's difftool and git difftool HEAD~1 opens each changed file with the older side on the left.