Like PSpice, but in your browser and built for digital logic
PSpice is Cadence's SPICE circuit simulator. Texas Instruments offers a no-cost edition, PSpice for TI, which it describes as a full-featured design and simulation suite using an analog analysis engine from Cadence, built on the OrCAD Capture schematic framework, with one of the largest model libraries in the industry across TI's analog and power parts. It simulates analog and complex mixed-signal designs, includes digital models for worst-case timing analysis, and works offline as a desktop installation. 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 PSpice is good at
For checking a real analog or mixed-signal design before you build it, PSpice is a long-established choice: detailed models and analyses and, in the TI edition, ready-made models for TI's parts at no cost. (digiwleea is an independent project, not affiliated with Cadence or Texas Instruments.)
How digiwleea is different
digiwleea is not a SPICE simulator: it treats transistors as switches, which is the level you need to understand digital logic and computers rather than analog voltages and currents. It runs in any browser with nothing to install, so it also answers "PSpice online" for logic, and its course takes you from CMOS gates through adders, latches, registers and RAM to an 8-bit CPU that you program in assembly, with an AI tutor (Wleea). PSpice is the better pick for analog and mixed-signal design; digiwleea is the better pick for learning digital logic and computer architecture. See also the LTspice and TINA-TI comparisons.
| PSpice | digiwleea | |
|---|---|---|
| Simulation | SPICE: analog and mixed-signal | Switch-level digital logic |
| Runs on | A desktop installation (works offline) | Any modern browser, nothing to install |
| Price | PSpice for TI: no cost | Free lab and Act I; Premium for the full course |
| Guided course to a CPU | No | Yes, 40+ levels |
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 PSpice 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.