SQiLs is a free, browser-based SQL practice platform for anyone who wants to sharpen their SQL skills - no setup, no installation. What makes it different: - Hundreds of interactive exercises from beginner to advanced - Real-world business logic & KPI analysis challenges — not just textbook queries - Works entirely in the browser - Track your progress as you go - Clean, distraction-free interface with dark mode Start practicing now at sqils.io - completely free.