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Desmos vs PhET Interactive Simulations: catalog facts
Desmos	PhET Interactive Simulations
Free The calculators are free to use.	Free Free interactive simulations.
Web	Web
Graphing, scientific, geometry and 3D calculators in one place Runs in the browser with nothing to install	Simulations can be used immediately with no signup or installation Covers a broad range of physics, chemistry and math topics in one place
Web-based, so it needs a browser and connection Not open source	Aimed at simulation-based exploration rather than structured, graded coursework Browser-based delivery, with no offline access described
Web application	Web application
Closed source	Closed source
License not stated	License not stated
No account 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 23, 2026	Official website Full listing and sources Checked September 22, 2026

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