Free online simulators by RAPTI — build circuits, program microcontrollers and PLCs, and practice right in your browser.
CKT Simulator
Real-time analog, digital and mixed-signal circuit simulator with 520 components, oscilloscope, multimeter, Bode plots and SPICE export.
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Arduino Simulator
Build Arduino and ESP32 circuits on a breadboard, write the code and watch your sketch run — no board needed.
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PLC Simulator
A 3D Delta PLC, HMI and VFD trainer: wire the devices, write ladder logic, design HMI screens and run Modbus.
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Raspberry Pi Simulator
A virtual Raspberry Pi 5, Pi 4 and Pico: wire a breadboard and run Python in Thonny, right in your browser.
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