Compare two things

See what changed between two pieces of text, two JSON documents, two spreadsheets, two images or two dates — each comparison runs in your browser, so neither version is ever uploaded.

Text Diff — Paste two versions of a text and see a line-by-line diff — additions, removals and unchanged lines colour-coded, with a count of what changed. Runs entirely in your browser; nothing is uploaded.
JSON Diff — A line diff on JSON is close to useless: reformatting makes every line look changed while the data is identical. This compares values by path and lists exactly what was added, removed or changed, with an option to treat arrays as unordered.
Compare Spreadsheets — Compare two versions of the same spreadsheet — CSV or Excel — and see which rows were added, removed or changed, and exactly which cell changed in each. Rows are matched on a key column rather than their position, because by the time you need a diff somebody has already sorted or inserted something. Duplicate keys are reported instead of quietly picking one.
Compare Images — Compare two images pixel by pixel and see exactly what changed — differences highlighted, side by side, or under a slider. Images of different sizes are not scaled to fit: only the overlapping region is compared and the pixels left out are counted, because scaling one to match the other reports a difference on every pixel. The tolerance is adjustable and explained, since two screenshots of the same page on different machines disagree on thousands of pixels by a level or two. Both images are read on your device.
Date Diff — Find the exact duration between two dates — years, months, days, plus total days and weeks. Runs entirely in your browser.

Compare two things

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