Free ESP32 Simulator Online — Run Real Firmware in Your Browser
Run it in your browser. Then build it for real.
A free circuit simulator that runs real ESP32 firmware in your browser — compile, watch the serial monitor, poke the pins. No install, no signup, nothing to solder while you learn. When the project works in the simulator, the kit makes it work on your desk.
Start with a guided example
Each example pairs a readable wiring-and-code guide on this site with the same circuit pre-loaded in the simulator. Read the guide, then press Run.
ESP32 Blink LED
The “hello world” of hardware — plus the two gotchas the tutorials skip: strapping pins and LED resistors.
ESP32 + DHT22 Sensor
Wire a temperature & humidity sensor, read it over one-wire, and print real values to the serial monitor.
ESP32 Wi-Fi Scanner
Scan nearby networks and print SSIDs with signal strength — the sanity check before any Wi-Fi project.
How it works
Pick a circuit
Start from 175+ examples or a blank breadboard in the editor. Every part wires up with a click — no jumper spaghetti.
Run real firmware
Write or paste Arduino C++ and hit Start. The emulator compiles it and runs the actual chip behavior — serial output, Wi-Fi, I2C, timing quirks included.
Build it for real
When it works on screen, grab the kit: same parts, pre-flashed firmware, tested on our bench. What you simulated is what ships.
Boards you can simulate
Simulator questions
Is the simulator really free?
Yes. Every example and the full editor are free to use in the browser, no account required. Signing in only adds extras like saved projects and AI Builder quotas.
Can I run my own code, not just the examples?
Yes. Open the editor, paste any Arduino C++ sketch, wire the parts it needs, and compile-and-run. The serial monitor shows exactly what a real board would print.
Does the simulator talk to real hardware?
No — that is the point. It is a safe place to learn and to validate a circuit before buying parts. When you want the physical version, our kits and parts shop carry exactly the boards and sensors the examples use.
Who builds the simulation engine?
The simulator runs on an open-source emulation engine that we self-host and maintain. Your projects stay on our infrastructure — no third-party accounts, no tracking pixels from outside services.