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Falstad Circuit Simulator vs PhET Interactive Simulations: catalog facts
Falstad Circuit Simulator	PhET Interactive Simulations
Free Free and open source. Hosting, hardware and any external services are separate.	Free Free interactive simulations.
Web	Web
Animates electrical behavior in circuit diagrams Includes example circuits to modify	Simulations can be used immediately with no signup or installation Covers a broad range of physics, chemistry and math topics in one place
A simulation is not a substitute for checking a physical circuit's component limits.	Aimed at simulation-based exploration rather than structured, graded coursework Browser-based delivery, with no offline access described
Web application	Web application
Open source	Closed source
License: GPL-2.0	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 22, 2026	Official website Full listing and sources Checked September 22, 2026

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