Like Wokwi, but for the logic inside the chips
Wokwi is an online electronics simulator for microcontroller projects: in the browser you write code for an Arduino, ESP32, STM32 or Raspberry Pi Pico board and run it with simulated parts and sensors, such as LEDs, displays, motors and buttons. It has a virtual logic analyzer for UART, I2C and SPI signals, a Visual Studio Code integration, and a small set of logic parts (NOT, AND, OR, XOR and NAND gates, a multiplexer, D flip-flops, and the 74HC595 and 74HC165 shift registers). It is free for personal use, with paid plans for commercial users. If that is what brought you here, digiwleea is a free, in-browser alternative with a different angle: you build a computer from the transistor up.
What Wokwi is good at
For embedded projects it is excellent: real firmware running on simulated boards, no hardware to buy or wire, quick sharing, and debugging tools that would be hard to set up on a desk. If you are learning Arduino or prototyping an IoT idea, it is the right tool. (digiwleea is an independent project, not affiliated with Wokwi or CodeMagic.)
How digiwleea is different
Wokwi runs programs on a microcontroller you never see inside; digiwleea is about what is inside. You build digital logic from CMOS transistors up, wiring gates into adders, latches, registers, RAM and control logic, and finish with an 8-bit CPU that you program in assembly, in a guided 40+ level course with an AI tutor (Wleea). Every circuit runs on a live logic simulator that shows each wire as 0, 1 or floating, and checks your parts against their truth tables. It does not run Arduino code or simulate sensors. Wokwi is the better pick for microcontroller projects; digiwleea is the better pick for learning how gates, flip-flops and processors work.
| Wokwi | digiwleea | |
|---|---|---|
| You simulate | Microcontroller boards running your code | Digital logic, from transistors to a CPU |
| Logic parts | A few gates, flip-flops, a MUX and two 74HC shift registers | Everything built from transistors, then reused as parts |
| Programming | Arduino, MicroPython and other firmware | Assembly on the 8-bit CPU you built |
| Runs in | The browser (and VS Code) | The browser, nothing to install |
| Price | Free for personal use; paid plans for commercial use | Free lab and Act I; Premium for the full course |
| Guided course | No (docs and example projects) | Yes, 40+ levels + AI tutor (Wleea) |
No sign-up is needed to start: open the lab and place your first transistor, or read the free theory course. The account (and the AI tutor) are optional.
See for yourself: build a logic gate from transistors in the simulator, then follow the path from sand to an 8-bit CPU.
Open the digiwleea lab →Frequently asked
Is digiwleea a good Wokwi alternative?
Yes, if you want to understand digital logic from the ground up. digiwleea is a free, in-browser simulator with a guided 40+ level course where you build every gate from CMOS transistors and work up to a real 8-bit CPU, with an AI tutor to help.
Is digiwleea free?
The sandbox lab and the first act of the course are free and need no sign-up. An optional account adds the AI tutor and cross-device sync; the full course and expanded AI tutoring are included in the monthly or annual Premium subscription.
Do I need to install anything?
No. digiwleea runs entirely in your browser, on desktop or mobile, and works offline once loaded.