How Website Technology Detection Actually Works

Every developer has wondered at some point: what is this site built with? Maybe you’re doing competitive research, reverse-engineering a stack decision, or just curious how a particularly fast site achieves its performance. Tools like Wappalyzer answer this question instantly. But how do they actually know? The answer is more interesting than you’d expect and involves four distinct layers of analysis working simultaneously. Layer 1: HTML Source Analysis The most obvious place to start is the raw