SystemCraft is an interactive system design practice platform. Most prep tools give you theory. SystemCraft gives you a canvas. Read deep-dive docs for 100+ real-world systems — then open the practice canvas and design it yourself with a drag-and-drop architecture builder. ✦ 100+ systems with deep documentation ✦ Interactive drag-and-drop canvas ✦ Structured learning roadmap ✦ Progress tracking ✦ AI-assisted generation Free to use. No fluff.