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

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