Compare software

PhET Interactive Simulations vs Step: catalog facts
PhET Interactive SimulationsStep
Free

Free interactive simulations.

Free

Free KDE application.

Web Linux
  • Simulations can be used immediately with no signup or installation
  • Covers a broad range of physics, chemistry and math topics in one place
  • Edit properties during a running simulation
  • Unit conversion and expression input
  • Aimed at simulation-based exploration rather than structured, graded coursework
  • Browser-based delivery, with no offline access described
  • Two-dimensional simulation only
  • Collision detection is discrete only
Web application 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

Checked September 22, 2026

Checked September 24, 2026

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