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Simulator

Raspberry Pi Pico W simulator, running in this tab

Mokxi is a free Raspberry Pi Pico W simulator that runs in your browser, with nothing to install and no account needed. The Pico W is a Raspberry Pi Pico with a wireless chip beside it. Mokxi runs the RP2040 exactly as it runs a Pico, does not model that chip at all, and simulates the WiFi instead, saying so on every page that mentions it. Wire the circuit, write the sketch, press Run.

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Raspberry Pi Pico W: blinklive0.000 s 0.00x
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Real firmware, running right now on our own core. Click it to open the circuit in the editor.
What is modeled

The numbers, not the marketing

Taken from the board's own contract document and put in plain words.

The same chip
An RP2040 on our own Cortex-M0+ core at 125 MHz, with SIO GPIO, the microsecond timer, UART0 and eight PWM slices. A program built for a Pico runs here unchanged.
WiFi, simulated, and it says so
The board joins a network, fetches a page and serves one, with the Arduino calls a tutorial gives you. The CYW43439 is not modeled and there is no 802.11 and no real internet under it: four made-up addresses under .mokxi and nothing that leaves this tab. Bluetooth is not simulated at all, and a sketch that reaches for it will not compile.
The LED is not on GP25
A Pico W’s lamp hangs off the wireless chip, and digitalWrite(LED_BUILTIN, HIGH) gets there: the runtime sends it down the same path the Arduino core uses on the real board. Writing 25 lights nothing here, and nothing on a real Pico W.
Go further

The full board page

Every peripheral area, every example and the wiring notes, in one place.

Raspberry Pi Pico W simulatorBlink, a button and the serial monitor, running.

Questions

Is it free?

Yes, all of it, with no card and no account needed to try it.

Can it connect to WiFi?

To a simulated one, yes, and it says so. Your sketch uses the real Arduino calls and the board joins, fetches and serves. There is no radio, no CYW43439 and no real internet under it. If real wireless is the point of your project, this is not the tool for it.

Why will digitalWrite(25, HIGH) not light anything?

Because on a Pico W GP25 is not the LED: it is the chip select for the CYW43439. The LED is on that chip’s own GPIO 0, and LED_BUILTIN goes there. A real Pico W behaves the same way.

Is it different from the Pico simulator?

Only in those respects: the LED is on the wireless chip rather than GP25, and there is a simulated network the Pico does not have. Same core, same pins, same compiler. The images are not interchangeable, because a Pico W one writes to a block a Pico leaves unmapped. Pick this one when it is the board on your desk.

Try your own firmware on the Pico W

What you build here runs on the board on your desk, unchanged. Nothing to install and no account needed.

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