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Proteus Design Suite vs ngspice: catalog facts
Proteus Design Suite	ngspice
Paid Commercial software sold by Labcenter Electronics.	Free Free and open source.
Windows	Command line
Simulates microcontroller firmware together with the circuit Schematic capture and PCB layout in one suite	Analog, digital and mixed-signal simulation Accepts PSPICE and LTSPICE device models
Commercial licence required Pricing is not listed on the homepage	No built-in schematic entry Netlist and command-line workflow has a learning curve
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it 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.