Both exist to close the gap between design and implementation
PerfectPixel and Uiprobe are both trying to solve the same underlying problem: the live page drifts from the design, and catching that drift manually is tedious and unreliable. If you're already using PerfectPixel, you already understand the pain. You're in the right place.
Manual overlay vs. automated detection
PerfectPixel works by overlaying a screenshot on top of your page and letting you eyeball the difference. You export an image from Figma, upload it to the extension, adjust the opacity, and squint. It works. But the judgment call is still yours. Uiprobe runs the comparison automatically and tells you what's off, where it is, and by exactly how much. You don't need to upload anything or interpret an overlay. The findings come to you.
Each finding includes exact deltas so you know precisely what's off and by how much.
Screenshot upload vs. Figma-native
Because PerfectPixel overlays images, your starting point is always a screenshot. Something you export from Figma, save to disk, and upload to the extension. That's a few steps before you've even started comparing. Uiprobe connects directly to Figma. You paste the frame URL, and that's it. No export step, no file management, and no version mismatch between the screenshot you uploaded last week and the design that changed on Monday.
Eyeballing vs. exact values
With an overlay, you can see that something's off. Quantifying it is still on you. Uiprobe shows you the expected value from Figma and the actual value on the live page, side by side, for every finding. The font weight that's 400 instead of 500. The gap that's 24px instead of 16px. You know exactly what to fix without opening DevTools to figure it out.
The method is what separates them
One-off check vs. version history
PerfectPixel is a point-in-time tool. You load the overlay, check the page, and move on. Uiprobe saves every comparison. Re-run it after a fix and you get a new version alongside the previous one. You can see what changed, what improved, and what's still open without starting from scratch each time.
At a glance
| Uiprobe | PerfectPixel | |
|---|---|---|
| Figma integration | Direct, paste frame URL | Upload screenshot manually |
| Detection method | Automated, findings surfaced for you | Manual overlay, you judge |
| Exact delta values | Expected vs. actual per finding | Not provided |
| Version history | Every run saved | No history |
| Works on localhost / staging | Via Chrome Extension | Any page in Chrome |
| Setup required | Sign in with Figma, paste frame URL | Export image from Figma, upload to extension |
| Free tier | 10 probes/month, free forever | Free, ad-supported |
