Rulerito

Stop guessing your window size. Rulerito sits quietly in the corner, tells you the exact pixels, and lets you resize it.

Rulerito: Rule your viewport. Testing responsiveness shouldn't be a hassle. Rulerito is a lightweight, developer-friendly tool that lives quietly in the bottom-right corner of your browser. Why use Rulerito? Instead of constantly opening DevTools or guessing dimensions, Rulerito gives you instant visual feedback and precise control right where you need it. Key Features: Live Dimensions: See your current viewport width and height in real-time. Pixel-Perfect Resizing: Manually input dimensions to resize your window instantly. Custom Presets: Save your most-used resolutions (Mobile, Tablet, Desktop) and switch between them with one click. Non-intrusive UI: Designed to look like a precise tool—dark mode, clean typography, and "always in your corner" without blocking your view. Perfect for: Frontend Developers QA Testers UI/UX Designers Privacy Promise: Rulerito operates locally on your machine. We do not track your browsing history or collect personal data. Your presets are stored locally in your browser. Get Rulerito today and make your responsive workflow a breeze.