Compare software

Qucs-S vs Proteus Design Suite: catalog facts
Qucs-S	Proteus Design Suite
Free Free and open source, supported by donations.	Paid Commercial software sold by Labcenter Electronics.
Windows, macOS, Linux	Windows
Graphical schematic entry for SPICE simulation Windows installer bundles Ngspice	Simulates microcontroller firmware together with the circuit Schematic capture and PCB layout in one suite
Simulation only; no PCB layout macOS install goes through Homebrew	Commercial licence required Pricing is not listed on the homepage
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.