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