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PhET Interactive Simulations vs Desmos: catalog facts
PhET Interactive Simulations	Desmos
Free Free interactive simulations.	Free The calculators are free to use.
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	Graphing, scientific, geometry and 3D calculators in one place Runs in the browser with nothing to install
Aimed at simulation-based exploration rather than structured, graded coursework Browser-based delivery, with no offline access described	Web-based, so it needs a browser and connection Not open source
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account 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 23, 2026

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