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Universe Sandbox vs Particle Physics Simulator: catalog facts
Universe Sandbox	Particle Physics Simulator
Paid One-time purchase from the website or Steam.	Free Free and open source under the GPL-2.0 licence.
Windows, macOS, Linux	Android
N-body gravity simulation using Newtonian mechanics Earth climate model you can alter	Real-time N-body gravity simulation Adjustable gravity, friction, particle count and collisions
Paid only Needs a reasonably capable desktop computer	Android only A sandbox rather than a structured course
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0-only
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 October 2, 2026

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