No. 17 of 91 ·Physics Simulation Software

Physion

Web · paid plans from $6/mo

Freedom report

Two barsScore 6.7

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Physion is ranked #17 of 91 in physics simulation software on Freedom251. It runs on Web. There is a free plan. Paid plans start at $6/mo.

Physion plans and pricing

All plans

Free Free Free forever, no trial 1 saved scene per month · ad-supported · publish and share scenes with a link physion.net · 28 Sept 2026

Basic $6/mo $6/mo or $60 a year 12 saved scenes per month · no ads physion.net · 28 Sept 2026

Pro $10/mo $10/mo or $100 a year 30 saved scenes per month · no ads · premium support physion.net · 28 Sept 2026

Compared on physics simulation software

Free plan: Yes
Paid from: $6/mo
Delivery mode: web
Authoring tools: Yes
3D visuals: No
Offline access: No

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The record

What it does: Physion is a browser-based 2D physics simulator for designing and running interactive physics experiments.
Shape and mechanism tools: It supports shapes including circles, rectangles, capsules, polygons, text bodies, polylines, spirals and gears, plus joints, springs and ropes.
Liquid and particle simulation: Physion simulates liquids, soft bodies and particle emitters using particle simulation.
Boolean and laser tools: The simulator provides boolean operations for combining or cutting shapes and laser rays that reflect off surfaces.
JavaScript scripting: Users can attach standard JavaScript Node Scripts to objects, handle lifecycle and collision callbacks, access the physion global and import external JavaScript libraries.
Graphs and force diagrams: Physion includes live graphs for motion, force, momentum and energy properties and free-body diagrams showing gravity, normal, friction, joint-reaction and spring forces.
Browser and installation: Physion runs in a modern desktop browser with no download, installer, plugin or browser extension, and scenes can be shared by URL.
Mobile limitation: Phones and tablets can open, watch and interact with existing scenes, but drawing and editing tools are disabled there.
Offline limitation: Physion requires an internet connection, stores saved scenes on its servers and has no offline or downloadable local app mode.
Authentication and billing integrations: Accounts use Google or Facebook sign-in, while paid subscriptions are handled through Stripe inside the app.
Security and processing: Physics calculations run locally in the user's browser rather than on a server, and Physion says it never sees card details because Stripe handles billing.
Open-source status: The Physion app is not open source, although the physion-assets and physion-translations companion repositories are public and open to contributions.
Target users: The maker describes Physion for teachers, students and hobbyists building classroom demonstrations, experiments and mechanical creations.
Support: Users can ask questions or discuss school and classroom needs on Discord, and the Pro plan includes premium support.
Price from: $6/mo

Where it ranks on Freedom251

Best Physics Simulation Software in 2026#17 of 91

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Sources

physion.net· checked 28 Sept 2026
physion.net/docs/faq· checked 28 Sept 2026
physion.net/pricing· checked 28 Sept 2026