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SimulIDE vs Qucs-S: catalog facts
SimulIDE	Qucs-S
Free Free and open source under the AGPLv3 licence.	Free Free and open source, supported by donations.
Linux	Windows, macOS, Linux
Simulates PIC, AVR and Arduino microcontrollers alongside analog and digital parts Built-in code editor and debugger with breakpoints	Graphical schematic entry for SPICE simulation Windows installer bundles Ngspice
Aimed at learning and hobby work rather than professional circuit design Debugging is described as basic	Simulation only; no PCB layout macOS install goes through Homebrew
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0	License: GPL-2.0
Not stated if an account is 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

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