Is PhET Simulations down or not working?

What happened to PhET Simulations, why did the service go down and not work? Here you can see who else is having the same problem with PhET Simulations, as well as possible solutions. According to our statistics, the following most often do not work: App Is Frozen, App Update Issue, App Won't Open, Login, Poor App Speed, Server Connection.

Current status: No failures

At the moment, according to our data, PhET Simulations is working fine, but single failures are possible. If PhET Simulations does not work for you, then report your problem and write a comment.
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PhET Simulations outage reports in the last 24 hours

User reports by hour (UTC), last 24 hours

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Total weight in 24 hours: 0 Busiest hour: 23:00 UTC (weight 0)

How this score compares

Current 24-hour weight is 0. Warnings start at 20, Failed at 50. Median services on this language today is 0.

Other services in this category

PhET Simulations offers free interactive math and science simulations for students and teachers. When the site or app misbehaves, this page collects user reports and helps you see whether the problem is on your end or theirs. Check current status, recent issues, and simple fixes before contacting support.
PhET Simulations is a collection of interactive simulations for physics, chemistry, math, biology, and earth science, built at the University of Colorado Boulder. The simulations run in a browser or through mobile apps and are used widely in classrooms and for homework. Common problems include simulations that fail to load, frozen screens, slow performance on older devices, and app updates that break older content. Server-side connection errors can also prevent simulations from opening at all. Start by refreshing the page or restarting the app. Clear your browser cache, try a different browser, and make sure JavaScript is enabled. Check that your internet connection is stable and that the app is updated to the latest version.

Questions

Is PhET Simulations down right now?

According to reports on this page, PhET Simulations looks fine for most people. Isolated failures still happen — report yours if you are stuck.

When was the last mass outage?

We do not have a recorded mass outage for PhET Simulations yet.

Why won't a simulation load in my browser?

Most loading failures come from an outdated browser, disabled JavaScript, or a cached copy of the page. Update your browser, enable JavaScript, clear the cache, and reload. If it still fails, the issue may be on the server side.

Do PhET simulations work offline?

Yes, to an extent. The desktop versions can be downloaded and run without internet, and some app features work offline too. Browser versions need an active connection to load.

PhET Simulations - error and failure reports, troubleshooting methods

Is PhET Simulations down or not working?
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