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CircuitSim vs Coulomb: catalog facts
CircuitSim	Coulomb
Free Free and open source under the Apache 2.0 licence.	Free Free and open source under the GPL-3.0 licence.
Linux	Linux
Simulation updates live while you edit the circuit Covers both analog values and basic logic gates	Plots voltage and current of components over time Clean GTK4 and libadwaita interface
Small project with few contributors Only basic digital logic support	Simpler than SPICE-based tools Small project with a single main developer
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0-or-later
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 October 1, 2026

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