An interactive, browser-based take on nand2tetris
nand2tetris (The Elements of Computing Systems) is the beloved course that has you build a computer starting from a single NAND gate. 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 nand2tetris is good at
nand2tetris is fantastic, and if you love its hardware track you are exactly who digiwleea is built for. It uses its own HDL and software simulator, with the work done in files you write and test.
How digiwleea is different
digiwleea takes the same "build a computer from the smallest part" idea and makes it visual, interactive, and gamified in the browser. You literally place transistors and wires, watch the signals settle live, and get instant truth-table verification, achievements, and an AI tutor, with no toolchain to install. It goes one level below NAND, too: you build NAND itself from CMOS transistors first.
| nand2tetris | digiwleea | |
|---|---|---|
| Starting point | The NAND gate | CMOS transistors (then NAND) |
| Medium | HDL files + simulator | Visual drag-and-wire, live signals |
| Setup | Download the toolchain | Nothing, runs in the browser |
| Feedback | Test scripts | Live sim + instant truth-table check |
| AI tutor | No | Yes (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 nand2tetris alternative?
Yes, if you want to understand digital logic from the ground up. digiwleea is a free, in-browser simulator and 30+ 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 tutor are a one-time unlock plus an optional subscription.
Do I need to install anything?
No. digiwleea runs entirely in your browser, on desktop or mobile, and works offline once loaded.