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Free online Arduino simulator

Circzy runs Arduino in your browser. Wire LEDs, sensors, motors and displays, program them with blocks or C++, and watch the circuit work like the real thing.

Start simulating freeQuick start guide
Free online Arduino simulator – Circzy

Supported boards

  • Arduino Uno, Nano and Mega 2560
  • ESP32 DevKit V1, WEMOS D1 Mini ESP32 and D1 R32
  • ESP8266 NodeMCU V3, NodeMCU Amica and WEMOS D1 Mini
  • Raspberry Pi Pico (RP2040)
  • STM32 Blue Pill (STM32F103)

Features

  • 100+ interactive parts
  • Block programming that generates real Arduino code
  • C++ sketch editor with a Library Manager
  • Compiled with the official Arduino toolchains
  • Serial Monitor, virtual WiFi and a virtual phone
  • Projects saved to your account and shareable by link

FAQ

Is the Circzy Arduino simulator free?

Yes. All features are free during the launch period. Sign in with Google to start.

Can I upload the code to a real Arduino?

Yes. Code is compiled with the official Arduino cores, so the same sketch runs on real hardware.

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Online ESP32 simulator with virtual WiFiSimulate ESP32 and ESP8266 boards in your browser with virtual WiFi, a web server and a virtual phone…A Wokwi alternative with blocks and classroomsLooking for a Wokwi alternative? Circzy simulates Arduino, ESP32, ESP8266, Pico and STM32 in the browser…

Ready to try it?

Sign in with Google, pick a board and run your first simulation in two minutes. Free during the launch period.

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