LoupeKit

LoupeKit is a browser extension designed for web developers, designers, and auditors to inspect and analyze web pages. The platform operates as a floating panel within the browser, offering 75 distinct tools and diagnostics to evaluate page design, underlying technology stacks, and performance. The tool features nine specialized surfaces, including stack detection, visual UI inspection, accessibility audits, SEO analysis, and domain details. It operates locally within the browser, requiring no host permissions at install and keeping user data private with zero external tracking. LoupeKit offers free basic diagnostics alongside a premium PRO tier that unlocks advanced tools such as scrapers, load timing, redirects analysis, and cookie editors.