PhET Simulations at a glance: what it does, its pricing, and the best AI alternatives for learning & education. Updated for 2026.
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Free interactive math and science simulations from the University of Colorado Boulder.
PhET Interactive Simulations is a project from the University of Colorado Boulder that offers free, browser-based simulations for physics, chemistry, biology, earth science and maths. Users change variables, such as the angle of a ramp or the concentration of a solution, and watch the result immediately, which makes abstract ideas easier to see. Teachers use them for demonstrations and student exploration, and many are available in multiple languages. The simulations show concepts rather than teach a full course, so they work best alongside a lesson or textbook.