QSPICE alternative: when you want logic, not SPICE
QSPICE is a circuit simulator from Qorvo that its makers call the next generation of SPICE. It is a downloadable program that runs locally on Windows 11 or 64-bit Windows 10, free for commercial use, with frequent updates. Qorvo lists higher simulation speed, accuracy and reliability, support for large amounts of digital logic, C++ and Verilog compilers included for behavioral blocks, quick creation of MOSFET, diode and JFET models, and publication-quality graphics. Qorvo's site has tutorial videos for it, including one by its creator, Mike Engelhardt. QSPICE computes the voltages and currents of a real circuit; digiwleea shows the 0s and 1s of logic you build from transistors.
What QSPICE is good at
Fast, accurate analog and mixed-signal simulation at no cost, including commercial use: power supplies, amplifiers, filters and the analog side of digital circuits, with C++ or Verilog for blocks that would be slow to model at the transistor level. If you know LTspice, QSPICE is a natural next look; on Linux or macOS, ngspice is the open-source option, and the SPICE simulators page compares them. (digiwleea is an independent project, not affiliated with Qorvo.)
How digiwleea is different
digiwleea is not a SPICE simulator. It runs in any browser and models digital logic at the switch level: NMOS and PMOS transistors are switches, and every wire is 0, 1 or floating. That is the right level for learning how gates, adders, latches, registers and a CPU work, which you build step by step in a 40+ level course with an AI tutor (Wleea). For voltages, timing and analog behaviour, use QSPICE; for the logic, digiwleea.
| QSPICE | digiwleea | |
|---|---|---|
| Simulates | Analog and mixed-signal circuits (SPICE), with C++ and Verilog blocks | Digital logic at the switch level |
| Runs on | Windows 11 or 64-bit Windows 10 | Any modern browser |
| Shows | Voltages, currents and waveforms | 0, 1 or floating on every wire, live |
| Learning path | Tutorials and forum | 40+ level course from transistors to a CPU |
| Price | Free, including commercial use | Free lab and Act I; Premium for the full course |
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.
More comparisons: Electronics and SPICE simulators
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 QSPICE free?
Yes. Qorvo offers QSPICE free, including for commercial use.
Does QSPICE run on Mac or Linux?
Qorvo lists Windows 11 or a 64-bit edition of Windows 10 as the system requirement. For Linux and macOS, ngspice is a free open-source SPICE engine.
What is the difference between QSPICE and LTspice?
Both are free SPICE simulators from chip companies: QSPICE from Qorvo, for Windows, and LTspice from Analog Devices, for Windows and macOS. Qorvo positions QSPICE as a newer SPICE with C++ and Verilog blocks and faster simulation; LTspice comes with models for Analog Devices parts and a library of demo circuits.
Can I simulate logic gates in QSPICE?
Yes, as transistor circuits or behavioral blocks with real voltages. To learn how logic gates and a CPU work at the logic level, a switch-level simulator such as digiwleea is simpler and runs in the browser.