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Algodoo vs Step: catalog facts
Algodoo	Step
Free Free to download, with an optional donation to support development.	Free Free KDE application.
macOS, iOS	Linux
Draw-and-play approach needs no physics or programming background Simulates fluids, friction, forces and optics	Edit properties during a running simulation Unit conversion and expression input
2D only; complex 3D mechanics need other software Release dates and update frequency are not published on the homepage	Two-dimensional simulation only Collision detection is discrete only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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