Regression diff

Compare two captures

Drop a before and after capture — Harpoon diffs them by canonical URL and flags exactly what crossed the waterline.

How the diff works

Before

Before HAR

or click to browse

DevTools → Network → Save all as HAR

After

After HAR

or click to browse

DevTools → Network → Save all as HAR

Compare captures

Add a before and after capture to run the diff.

Just one capture? Use Analyze mode to score a single HAR.