Fitts

Fitts is a desktop AI agent that tests your website or Android app the way a real person would, finds the usability problems, and fixes them in your code. Open your project folder and Fitts starts your dev server, interviews you about who the app is for, then explores every page: - It clicks, types and navigates across five viewports, from phone to desktop. - It asks before anything risky, like paying or deleting. - It runs nine measured checks plus axe, including contrast, target size, focus, labels, leaked placeholders, loading feedback, wasted network requests, broken links and content that jumps. - Five reviewer personas (novice, power user, accessibility, visual design, and trust) judge each page against Nielsen’s ten usability heuristics and five more lenses: accessibility, performance, look and feel, ergonomics and content. Every finding comes with evidence, a severity, the exact element outlined, steps to reproduce and a suggested fix. You approve fixes, and Muse Code writes each patch on its own branch. Fitts then reruns its own checks, so the fixer never grades its own work. A fix only counts when the problem is actually gone. Fitts can also redesign a site, offering style boards before it changes any code. You can talk to Fitts by chat or voice while it works.