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Offline Access

Full Install

The full PhET Offline Website Installer package installs a copy of the PhET website in English onto your computer. Once installed, you do not need to be connected to the Internet to view or run any of the simulations as long as you have Java, Flash, and a web browser such as Firefox, Chrome, or Internet Explorer. Java is required to open the Java simulations. It can be downloaded here: http://java.com/. See our system requirements for more detail.

If a website installer that supports languages other than English is needed, please contact us.

These installers of the PhET simulations are updated frequently. We suggest uninstalling your earlier versions before installing a new one. The installers were last updated on Sep 16, 2018 at 1:00:02 AM MDT.

Download installer with simulations only (no activities)
Download installer with simulations and activities

If you have an Internet connection that is too slow, we can send you a DVD-ROM with the full installation package. Please specify the type of installer (above) when contacting us.

One at a Time

Simulation Name HTML5 Flash Java
Acid-Base Solutions HTMLHTML5 JavaJava
Alpha Decay JavaJava
Area Builder HTMLHTML5
Area Model Algebra HTMLHTML5
Area Model Decimals HTMLHTML5
Area Model Introduction HTMLHTML5
Area Model Multiplication HTMLHTML5
Arithmetic HTMLHTML5 FlashFlash
Atomic Interactions HTMLHTML5 JavaJava
Balancing Act HTMLHTML5 JavaJava
Balancing Chemical Equations HTMLHTML5 JavaJava
Balloons & Buoyancy JavaJava
Balloons and Static Electricity HTMLHTML5 JavaJava
Band Structure JavaJava
Battery-Resistor Circuit JavaJava
Battery Voltage JavaJava
Beer's Law Lab HTMLHTML5 JavaJava
Bending Light HTMLHTML5 JavaJava
Beta Decay JavaJava
Blackbody Spectrum FlashFlash
Build a Fraction JavaJava
Build a Molecule JavaJava
Build an Atom HTMLHTML5 JavaJava
Buoyancy FlashFlash
Calculus Grapher FlashFlash
Capacitor Lab JavaJava
Capacitor Lab: Basics HTMLHTML5
Charges And Fields HTMLHTML5
Charges and Fields FlashFlash
Circuit Construction Kit: DC HTMLHTML5
Circuit Construction Kit (DC Only) JavaJava
Circuit Construction Kit: DC - Virtual Lab HTMLHTML5
Circuit Construction Kit (DC Only), Virtual Lab JavaJava
Circuit Construction Kit (AC+DC) JavaJava
Circuit Construction Kit (AC+DC), Virtual Lab JavaJava
Collision Lab FlashFlash
Color Vision HTMLHTML5 JavaJava
Concentration HTMLHTML5 JavaJava
Conductivity JavaJava
Curve Fitting FlashFlash
Davisson-Germer: Electron Diffraction JavaJava
Density FlashFlash
Double Wells and Covalent Bonds JavaJava
Eating & Exercise JavaJava
Electric Field Hockey JavaJava
Electric Field of Dreams JavaJava
Energy Forms and Changes JavaJava
Energy Skate Park JavaJava
Energy Skate Park: Basics HTMLHTML5 JavaJava
Equality Explorer HTMLHTML5
Equality Explorer: Basics HTMLHTML5
Equality Explorer: Two Variables HTMLHTML5
Equation Grapher FlashFlash
Estimation FlashFlash
Expression Exchange HTMLHTML5
Faraday's Electromagnetic Lab JavaJava
Faraday's Law HTMLHTML5 FlashFlash
Fluid Pressure and Flow JavaJava
Forces and Motion JavaJava
Forces and Motion: Basics HTMLHTML5 JavaJava
Forces in 1 Dimension JavaJava
Fourier: Making Waves JavaJava
Fraction Matcher HTMLHTML5 JavaJava
Fractions Intro JavaJava
Friction HTMLHTML5 FlashFlash
Function Builder HTMLHTML5
Function Builder: Basics HTMLHTML5
Gas Properties JavaJava
Gene Expression Essentials HTMLHTML5
Gene Expression - The Basics JavaJava
Gene Machine: The Lac Operon JavaJava
Generator JavaJava
Geometric Optics FlashFlash
Glaciers JavaJava
Graphing Lines HTMLHTML5 JavaJava
Graphing Slope-Intercept HTMLHTML5
Gravity And Orbits HTMLHTML5
Gravity and Orbits JavaJava
Gravity Force Lab HTMLHTML5 JavaJava
The Greenhouse Effect JavaJava
Hooke's Law HTMLHTML5
Isotopes and Atomic Mass HTMLHTML5 JavaJava
John Travoltage HTMLHTML5 JavaJava
Ladybug Motion 2D JavaJava
Ladybug Revolution JavaJava
Lasers JavaJava
Least-Squares Regression HTMLHTML5
Lunar Lander FlashFlash
Magnet and Compass JavaJava
Magnets and Electromagnets JavaJava
Make a Ten HTMLHTML5
Masses and Springs HTMLHTML5
Masses & Springs FlashFlash
Maze Game JavaJava
Membrane Channels JavaJava
Microwaves JavaJava
Models of the Hydrogen Atom JavaJava
Molarity HTMLHTML5 JavaJava
Molecular Motors JavaJava
Molecule Polarity HTMLHTML5 JavaJava
Molecules and Light HTMLHTML5 JavaJava
Molecule Shapes HTMLHTML5 JavaJava
Molecule Shapes: Basics HTMLHTML5 JavaJava
Motion in 2D JavaJava
The Moving Man JavaJava
My Solar System FlashFlash
Natural Selection JavaJava
Neon Lights & Other Discharge Lamps JavaJava
Neuron HTMLHTML5 JavaJava
Normal Modes FlashFlash
Nuclear Fission JavaJava
Ohm's Law HTMLHTML5 FlashFlash
Optical Quantum Control JavaJava
Optical Tweezers and Applications JavaJava
Pendulum Lab HTMLHTML5 FlashFlash
Photoelectric Effect JavaJava
pH Scale HTMLHTML5 JavaJava
pH Scale: Basics HTMLHTML5
Plate Tectonics JavaJava
Plinko Probability HTMLHTML5 FlashFlash
Projectile Motion HTMLHTML5 FlashFlash
Proportion Playground HTMLHTML5
Quantum Bound States JavaJava
Quantum Tunneling and Wave Packets JavaJava
Quantum Wave Interference JavaJava
Radiating Charge FlashFlash
Radioactive Dating Game JavaJava
Radio Waves & Electromagnetic Fields JavaJava
The Ramp JavaJava
Ramp: Forces and Motion JavaJava
Reactants, Products and Leftovers HTMLHTML5 JavaJava
Reactions & Rates JavaJava
Resistance in a Wire HTMLHTML5 FlashFlash
Resonance FlashFlash
Reversible Reactions JavaJava
Rutherford Scattering HTMLHTML5 JavaJava
Salts & Solubility JavaJava
Self-Driven Particle Model JavaJava
Semiconductors JavaJava
Signal Circuit JavaJava
Simplified MRI JavaJava
Sound JavaJava
States of Matter HTMLHTML5 JavaJava
States of Matter: Basics HTMLHTML5 JavaJava
Stern-Gerlach Experiment FlashFlash
Stretching DNA JavaJava
Sugar and Salt Solutions JavaJava
Torque JavaJava
Trig Tour HTMLHTML5
Under Pressure HTMLHTML5 JavaJava
Unit Rates HTMLHTML5
Vector Addition FlashFlash
Wave Interference JavaJava

We offer an Android app that allows native offline use of all the HTML5 sims. Find it on the Play Store here. It is available on select Chromebooks.

All the HTML5 sims

in an app!

  • Compatible with select Chromebooks
  • Ideal for offline use
  • Includes favorites, filtering, and automatic updates
  • All proceeds support HTML5 sims (only $0.99!)

One at a Time

Simulation Name Technology
Acid-Base Solutions DownloadHTML5
Area Builder DownloadHTML5
Area Model Algebra DownloadHTML5
Area Model Decimals DownloadHTML5
Area Model Introduction DownloadHTML5
Area Model Multiplication DownloadHTML5
Arithmetic DownloadHTML5
Atomic Interactions DownloadHTML5
Balancing Act DownloadHTML5
Balancing Chemical Equations DownloadHTML5
Balloons and Static Electricity DownloadHTML5
Beer's Law Lab DownloadHTML5
Bending Light DownloadHTML5
Build an Atom DownloadHTML5
Capacitor Lab: Basics DownloadHTML5
Charges And Fields DownloadHTML5
Circuit Construction Kit: DC DownloadHTML5
Circuit Construction Kit: DC - Virtual Lab DownloadHTML5
Color Vision DownloadHTML5
Concentration DownloadHTML5
Energy Skate Park: Basics DownloadHTML5
Equality Explorer DownloadHTML5
Equality Explorer: Basics DownloadHTML5
Equality Explorer: Two Variables DownloadHTML5
Expression Exchange DownloadHTML5
Faraday's Law DownloadHTML5
Forces and Motion: Basics DownloadHTML5
Fraction Matcher DownloadHTML5
Friction DownloadHTML5
Function Builder DownloadHTML5
Function Builder: Basics DownloadHTML5
Gene Expression Essentials DownloadHTML5
Graphing Lines DownloadHTML5
Graphing Slope-Intercept DownloadHTML5
Gravity And Orbits DownloadHTML5
Gravity Force Lab DownloadHTML5
Hooke's Law DownloadHTML5
Isotopes and Atomic Mass DownloadHTML5
John Travoltage DownloadHTML5
Least-Squares Regression DownloadHTML5
Make a Ten DownloadHTML5
Masses and Springs DownloadHTML5
Molarity DownloadHTML5
Molecule Polarity DownloadHTML5
Molecules and Light DownloadHTML5
Molecule Shapes DownloadHTML5
Molecule Shapes: Basics DownloadHTML5
Neuron DownloadHTML5
Ohm's Law DownloadHTML5
Pendulum Lab DownloadHTML5
pH Scale DownloadHTML5
pH Scale: Basics DownloadHTML5
Plinko Probability DownloadHTML5
Projectile Motion DownloadHTML5
Proportion Playground DownloadHTML5
Reactants, Products and Leftovers DownloadHTML5
Resistance in a Wire DownloadHTML5
Rutherford Scattering DownloadHTML5
States of Matter DownloadHTML5
States of Matter: Basics DownloadHTML5
Trig Tour DownloadHTML5
Under Pressure DownloadHTML5
Unit Rates DownloadHTML5
Wave on a String DownloadHTML5

We offer an iPad app that allows native offline use of all the HTML5 sims. Find it on the app store here.

All the HTML5 sims

in an app!

  • Natively designed for iPad
  • Ideal for offline use
  • Includes favorites, filtering, and automatic updates
  • All proceeds support HTML5 sims (only $0.99!)

In order to 'Download' an individual sim to use on an iPad (offline), you'll need to add it to the iPad reading list.


To access a PhET simulation on an iPad while not connected to the internet, first open the sim in Safari by clicking the play button. Tap the Action button and then tap Add to Reading List. In the future, simply tap the Bookmarks icon and tap the sim page that is saved in the Reading List.

One at a Time

Simulation Name Technology
Acid-Base Solutions DownloadHTML5
Area Builder DownloadHTML5
Area Model Algebra DownloadHTML5
Area Model Decimals DownloadHTML5
Area Model Introduction DownloadHTML5
Area Model Multiplication DownloadHTML5
Arithmetic DownloadHTML5
Atomic Interactions DownloadHTML5
Balancing Act DownloadHTML5
Balancing Chemical Equations DownloadHTML5
Balloons and Static Electricity DownloadHTML5
Beer's Law Lab DownloadHTML5
Bending Light DownloadHTML5
Build an Atom DownloadHTML5
Capacitor Lab: Basics DownloadHTML5
Charges And Fields DownloadHTML5
Circuit Construction Kit: DC DownloadHTML5
Circuit Construction Kit: DC - Virtual Lab DownloadHTML5
Color Vision DownloadHTML5
Concentration DownloadHTML5
Energy Skate Park: Basics DownloadHTML5
Equality Explorer DownloadHTML5
Equality Explorer: Basics DownloadHTML5
Equality Explorer: Two Variables DownloadHTML5
Expression Exchange DownloadHTML5
Faraday's Law DownloadHTML5
Forces and Motion: Basics DownloadHTML5
Fraction Matcher DownloadHTML5
Friction DownloadHTML5
Function Builder DownloadHTML5
Function Builder: Basics DownloadHTML5
Gene Expression Essentials DownloadHTML5
Graphing Lines DownloadHTML5
Graphing Slope-Intercept DownloadHTML5
Gravity And Orbits DownloadHTML5
Gravity Force Lab DownloadHTML5
Hooke's Law DownloadHTML5
Isotopes and Atomic Mass DownloadHTML5
John Travoltage DownloadHTML5
Least-Squares Regression DownloadHTML5
Make a Ten DownloadHTML5
Masses and Springs DownloadHTML5
Molarity DownloadHTML5
Molecule Polarity DownloadHTML5
Molecules and Light DownloadHTML5
Molecule Shapes DownloadHTML5
Molecule Shapes: Basics DownloadHTML5
Neuron DownloadHTML5
Ohm's Law DownloadHTML5
Pendulum Lab DownloadHTML5
pH Scale DownloadHTML5
pH Scale: Basics DownloadHTML5
Plinko Probability DownloadHTML5
Projectile Motion DownloadHTML5
Proportion Playground DownloadHTML5
Reactants, Products and Leftovers DownloadHTML5
Resistance in a Wire DownloadHTML5
Rutherford Scattering DownloadHTML5
States of Matter DownloadHTML5
States of Matter: Basics DownloadHTML5
Trig Tour DownloadHTML5
Under Pressure DownloadHTML5
Unit Rates DownloadHTML5
Wave on a String DownloadHTML5
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