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