Build a working circuit before your parts arrive.

Yes. The simulator, boards, parts, code compiler, serial monitor and sharing all work on the Free plan. No card is required. Paid plans add collaboration, more cloud history and classroom tools.

No. Mokxi runs in the browser. Open it on a computer, tablet or phone and your circuit runs there.

Classroom adds rosters, assignments with checks, a teacher dashboard and whole-class collaboration, for $9.99 a student a year, from 5 students. Your own seat is free. Pay by card, invoice or purchase order.

45 boards: 42 compile your own sketch in the browser (Arduino boards from the Uno to the Uno R4, ESP32 and ESP8266 boards, the Raspberry Pi Pico, STM32 boards, the micro:bit V2 and the ATtiny85), and the Raspberry Pi computers run Python. There are 505 parts on a real 0.1 inch breadboard, from LEDs and sensors to displays, motors and bench instruments such as an oscilloscope and a logic analyzer.

Yes. The sketch is ordinary Arduino code, so the same sketch builds for the real board. With Pro, Send to board uploads it from Chrome or Edge to an Arduino Uno, Nano, Mega or Leonardo over USB, and a Pico or a micro:bit gets a file to drag onto it. Every board’s Arduino IDE steps are free on every plan.

They are built for different people. Tinkercad Circuits is the better first tool for young beginners who need block coding. Wokwi covers the most ESP32 chips and ESP-IDF, Rust and custom chips. Mokxi fits teacher-led classes, circuits where analog parts must behave like real ones beside the firmware, and several boards in one simulation. Its comparison pages source every claim.