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