Like Sebastian Lague's Digital Logic Sim, but in your browser
Digital Logic Sim (DLS) is the beautiful free logic sandbox from Sebastian Lague's popular video: you drag gates onto a canvas, wire them up, and package them into reusable chips. It runs as a downloadable desktop app. 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 Sebastian Lague's Digital Logic Sim is good at
DLS is a gorgeous, satisfying sandbox, and its "wire it up and watch it work" feel is wonderful. If his video is what got you curious, you are exactly who digiwleea is for. (digiwleea is an independent project, not affiliated with Sebastian Lague.)
How digiwleea is different
digiwleea runs entirely in the browser with nothing to download, and it starts one layer deeper: instead of beginning at ready-made gates, you build the gates themselves from CMOS transistors and the simulator verifies them against the real truth table. It also wraps the building in a guided 30+ level course from a single transistor up to a working 8-bit CPU, with theory lessons and an AI tutor (Wleea). DLS is the purer freeform sandbox; digiwleea is more of a guided path to understanding the machine, though you can still free-build any circuit you like and save it as a reusable part.
| Sebastian Lague's Digital Logic Sim | digiwleea | |
|---|---|---|
| Runs in | Downloadable desktop app | The browser, nothing to install |
| Smallest building block | Pre-built gates | CMOS transistors (build the gates too) |
| Reusable parts library | Package chips | Yes, every level saves a part |
| Guided course to a CPU | No (open sandbox) | Yes, 30+ levels |
| Live truth-table check | Manual | Instant, built in |
| 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 Sebastian Lague's Digital Logic Sim 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.