Our project originally focused on physics sims, and was hence named the *Ph*ysics *E*ducation *T*echnology project, or *PhET*. When we branched into chemistry, biology, mathematics and other areas, we decided to keep the name *PhET*, but to no longer describe it as an acronym.

We offer apps for both iOS and Android/Chromebook. Please see specific information by platform:

Android phone/tablet
iOS iPad/iPhone

All versions of our apps allow native, offline use of all of our HTML5 sims and proceeds fund more HTML5 sim development.

Education technology companies, publishers, media libraries, and hardware providers are partnering with PhET to transform their educational products with PhET's award-winning collection of interactive simulations. A partnership provides additional benefits and services that help you to get the most out of the collection of simulations.

Learn more about a partnership with PhET.

No license is required. Any students or educators (K-12, university, or continuing education) can use the simulations for free. You do not need to seek any further permissions from us.

For information about sharing or redistributing PhET simulations, see our Licensing page.

Researchers are encouraged to use PhET simulations in their work. at phet.colorado.edu in their research projects. You do not need to seek any further permissions from us.

All simulations available at https://phet.colorado.edu are open educational resources and provided under the Creative Commons Attribution 4.0 license (CC BY 4.0). Likewise, any screenshots, videos, or other derivative works using the PhET simulations that are published in peer-reviewed journals or other distribution channels are covered under our CC-BY license. The following attribution is required to share or redistribute PhET sims, screenshots, or other derivative works:

Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC-BY-4.0

See these best practices for attribution.

We are happy to accept new ideas and suggestions for improvements about existing simulations. Submit your ideas here!

Click the "Embed" button under the simulation you would like to embed. This will bring up a text box of html code that you can copy and paste in order to embed the sim. Flash sims may be directly embedded or linked via an image to launch the sim. Java sims may only be linked via an image to launch the sim.

Some LMS may require you to use "https://" for the URL of the simulation.

Yes! You can insert our HTML5 sims into a PowerPoint presentation using our Office Mix app

This add-in works in: PowerPoint 2013 Service Pack 1 or later, PowerPoint 2016 for Mac, PowerPoint 2016 or later, PowerPoint Online.

For information on getting Office Add-ins for Powerpoint, see this link.

PhET cares deeply about student privacy and we orient our website and resource practices to streamline student access without collection of student data.

PhET Privacy Policy

Simulation Licensing Agreement and Terms of Use

HTML5 Sim Software Agreement

Java/Flash Software Agreement

The PhET HTML5 and Javascript source code lives on the PhET GitHub page. The PhET Java, Flash, and Flex source code lives in a Subversion repository. To get more information about accessing, see the Source Code page.

Not all activities have answers. Some activity authors will share answer keys will fellow teachers - try emailing the author of the activity.

We are here to support your remote learning needs. See our remote teaching tips and early access to sims in progress.

PhET Interactive Simulations is a nonprofit project based at the University of Colorado Boulder. Our team of designers, researchers, educators, and developers is dedicated to producing high quality STEM resources. We rely upon our users to keep PhET free for everyone. Donations to PhET can be made electronically through Network for Good.

Alternatively, a check may be made out to "University of CO Foundation" include “PhET 0123247” in the memo section.
Mail directly to:
University of CO Foundation
P.O. Box 17126
Denver CO 80217-9155