ContrastLab is a free, browser-based toolkit I built on Blogger to help designers, developers, bloggers, and content creators check the three most common readability problems: 𝐜𝐨𝐥𝐨𝐫 𝐜𝐨𝐧𝐭𝐫𝐚𝐬𝐭, 𝐟𝐨𝐧𝐭 𝐩𝐚𝐢𝐫𝐢𝐧𝐠, and 𝐭𝐞𝐱𝐭 𝐝𝐢𝐟𝐟𝐢𝐜𝐮𝐥𝐭𝐲. The site hosts three interactive tools a Color Contrast Checker, a Font Pairing Generator, and a Text Readability Checker all built from scratch with vanilla HTML, CSS, and JavaScript, and all running entirely in the browser with no signup, no downloads, and no server-side processing.