One Chrome Extension That Replaces Them All

onHover's Tech Stack Detector identifies the CMS, frontend framework (React, Vue, Next.js, etc.), analytics tools, CDN, hosting provider, SSL certificate, and DNS records for any site. Because it runs inside your existing browser tab, it has full access to the same JavaScript runtime and HTTP headers the page itself sees — giving more accurate results than Wappalyzer's signature matching. No second browser window, no extension conflicts.

onHover's API Tester lets you send GET, POST, PUT, PATCH, and DELETE requests with custom headers, bearer tokens, and JSON bodies directly from a browser tab. Unlike Postman, it runs in the same session context as your tab — so it inherits your authentication cookies automatically and avoids CORS preflight errors on localhost. No desktop app to install, no token copy-paste, no separate window.

onHover's Page Insights panel captures LCP, FCP, CLS, INP, and TTFB as a snapshot from the browser's own Performance APIs — the same signal Lighthouse uses, without sending your URL to Google's servers or waiting for a remote audit. Results appear in seconds on any page, including pages behind authentication or on localhost, which PageSpeed Insights cannot reach.

onHover's SEO Analyzer surfaces meta tags, OG data, Twitter Card tags, canonical URLs, heading hierarchy, internal and external links, and structured data in a single panel — without opening DevTools or copying page source. It covers everything SEOquake and Meta SEO Inspector cover individually, in one consistent interface alongside your other developer tools.

onHover combines a pixel-level color eyedropper (with HEX, RGB, and HSL output and palette history) with a WCAG Contrast Checker that calculates contrast ratios and shows AA/AAA pass-fail ratings for normal and large text. ColorZilla covers color picking; Colour Contrast Analyser covers contrast. onHover does both in the same tool panel.

onHover's Responsive Tester lets you switch between device presets (iPhone, iPad, Android, Desktop) or enter a custom width without opening DevTools or switching to a separate Responsively window. The page re-renders at the target viewport immediately, with rotate and zoom support. Your current browser session, cookies, and state are all preserved — which DevTools device mode often disrupts.