Falstad.com

Interactive physics is the standout idea behind Falstad.com: its browser-based circuit simulator lets people build electronic circuits and see their behavior, while related visualizations explore other technical subjects. That hands-on format makes abstract concepts easier to connect with observable results, which is valuable for students, hobbyists, and people learning electronics. By our assessment, the site’s main strength is that experiments can be explored directly rather than only read about. Its simulations are best treated as learning tools, not as a substitute for professional design software or real-world testing. The experience also depends on a screen and some patience with the controls, especially when a circuit becomes complex.