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CircuitSim vs Qucs-S: catalog facts
CircuitSim	Qucs-S
Free Free and open source under the Apache 2.0 licence.	Free Free and open source, supported by donations.
Linux	Windows, macOS, Linux
Simulation updates live while you edit the circuit Covers both analog values and basic logic gates	Graphical schematic entry for SPICE simulation Windows installer bundles Ngspice
Small project with few contributors Only basic digital logic support	Simulation only; no PCB layout macOS install goes through Homebrew
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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