// the find
una/diffee
Instant visual diffing in the browser
A single-page browser tool that does side-by-side visual diffing of two URLs by loading them in iframes. Aimed at frontend developers and designers who want a quick sanity check between two versions of a page without pulling out a screenshot diffing tool.
- Zero backend — runs entirely in the browser, so there's nothing to deploy or auth against
- Works with localhost URLs, which is the actual use case most people reach for something like this
- Tiny scope means you can read the whole thing in ten minutes and fork it without ceremony
- Last commit was 2018 — iframe-based cross-origin diffing is broken for most modern sites due to X-Frame-Options and CSP headers, which means the core feature simply won't work on the vast majority of URLs today
- The README is a copy-paste from a Gulp starter template and describes setting up Sass/Gulp rather than explaining how the tool actually works
- 216 stars but 8 years of abandonment with no issues addressed — adopting this means owning it completely
- No actual diffing logic visible in the repo structure; it appears to just load two URLs side by side, which is a scroll-sync viewer, not a diff tool