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Developer toolkit - Colour Picker, Font Inspector, Ruler, Screenshot and more! DevKit Pro is a free, all-in-one browser toolkit for developers, SEO specialists, designers and QA testers. Instead of installing five separate extensions, get eight essential tools in one lightweight package. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ WHAT'S INSIDE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ SEO INSPECTOR — Free SEO Checker Run a full on-page SEO audit in one click: title tag, meta description, canonical URL, heading structure (H1–H6), image ALT text, internal and external links, nofollow links, Open Graph tags, schema/structured data, sitemap.xml and robots.txt. See your SEO health score and exactly what to fix. COLOUR PICKER Pick the exact colour of any pixel on any webpage. Copy the result instantly as HEX, RGB, HSL, or ready-to-paste CSS. FONT INSPECTOR (WhatFont-style) Click any text on a page to see its font family, size, weight, line-height, letter-spacing and colour — no more guessing what font a site uses. PAGE RULER Measure any element's width, height, padding and margin in pixels. Compare the gap between two elements with a single click. TECH DETECTOR Instantly see what technology stack a website is built on — CMS, frontend framework, CSS framework, JavaScript libraries, analytics tools, hosting provider, CDN and more. SCREENSHOT TOOL & SCREEN RECORDER Capture the visible area, the full scrolling page, or a custom selection. Edit your screenshot with a built-in tool for arrows, shapes, blur and highlights. Record your screen, a single browser tab, or your webcam. IMAGE COMPRESSOR Shrink image file sizes with no visible loss in quality — before uploading anywhere. FORM FILLER Fill any web form with realistic random test data in one click. Built for testing signup flows, checkout pages and forms without typing "test@test.com" for the hundredth time. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ WHY DEVELOPERS & MARKETERS USE DEVKIT PRO ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ✓ 8 tools in 1 extension — stop juggling five different add-ons ✓ Works on any website — no account, no sign-up, no login required ✓ Clean, fast interface with zero ads ✓ One-click SEO audits you'd otherwise need a paid tool for ✓ Actively maintained and regularly updated ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ WHO IT'S FOR ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Web developers auditing pages for SEO and performance • SEO specialists checking on-page factors without leaving the browser • QA and test engineers filling out forms during testing • Designers picking colours and fonts from live sites • Agencies auditing client websites • Anyone who needs a quick screenshot or screen recording Try it free — no credit card, no account, no catch.