Multisim Portable -

Analog Devices’ LTspice is completely free, lightweight, and can be made portable using the format or simply by copying the installation folder (yes, LTspice runs without registry entries).

Technically inclined users have managed to create portable versions of Multisim (usually version 11, 12, 14, or even 14.3) using specific tools: multisim portable

The software is known for its intuitive graphical interface, extensive component library (over 20,000 components), and advanced simulation types—including transient, DC sweep, AC analysis, and microcontroller co-simulation. Analog Devices’ LTspice is completely free

A: Falstad’s Circuit Simulator (browser-based) or LTspice portable (approx. 50MB). extensive component library (over 20

If you need a truly portable (USB-drive friendly) simulator:

Open any supported web browser on any computer to access your designs instantly.