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SimulIDE vs LTspice: catalog facts
SimulIDE	LTspice
Free Free and open source under the AGPLv3 licence.	Free Free to download from Analog Devices.
Linux	Windows
Simulates PIC, AVR and Arduino microcontrollers alongside analog and digital parts Built-in code editor and debugger with breakpoints	SPICE simulation with schematic capture in one program Built-in waveform viewer for inspecting results
Aimed at learning and hobby work rather than professional circuit design Debugging is described as basic	Simulation only, with no PCB layout Details could not be confirmed from the official page at research time
Downloadable app	Downloadable app
Open source	Closed source
License: AGPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 24, 2026

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