GateLab is a free logic gate simulator for school: build circuits with AND, OR, NOT, NAND, NOR, XOR and XNOR gates, flip-flops, chips, Arduino, ESP32 and Raspberry Pi Pico boards and a real x86 CPU. Truth tables, waveforms, Verilog export, Learn challenges that check themselves, and live sessions for a whole class. JavaScript is needed to use it. Lessons: how to learn logic gates · For teachers