digiwleea: a free Logisim alternative
Logisim is a long-standing free digital logic simulator assigned in many university courses, running as a Java desktop application (the original is discontinued; the community fork Logisim-Evolution carries it on). 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 Logisim is good at
Logisim is capable and familiar, especially if your course already requires it: gate and subcircuit design, a timing chronogram, and everything running locally offline.
How digiwleea is different
digiwleea runs entirely in the browser with nothing to install, which sidesteps the Java setup that makes Logisim awkward on modern Macs and locked-down school machines. It also teaches from a deeper layer: instead of starting at ready-made gates, you build them from individual CMOS transistors, verified against the real truth table, then follow a 30+ level course all the way to a working 8-bit CPU, with achievements and an AI tutor (Wleea) alongside. Logisim is a capable sandbox; digiwleea is a guided path to understanding the whole machine.
| Logisim | digiwleea | |
|---|---|---|
| Runs in | Java desktop app | The browser, nothing to install |
| Setup | Install Java + the .jar | Open a URL |
| Smallest building block | Pre-built gates | Individual CMOS transistors |
| Guided curriculum | Open sandbox | 30+ level course, transistor to CPU |
| AI tutor | No | Yes (Wleea, account-gated) |
| Price / license | Free, open source | Free, in-browser, no sign-up to start |
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 Logisim 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.