Our story
PrepOK began with a simple frustration. The fastest way to understand an idea like the gas laws, the unit circle, or how a molecule bonds is to play with it, yet most of what is online is static text and flat diagrams. A student reads the words, memorizes a formula, and still never sees the thing move.
So we build the opposite: hands-on interactives where you change something and immediately see what happens. Heat a box of atoms and watch it boil. Drag a temperature slider and watch a gas expand. Snap atoms together and see the molecule that forms. Every lesson is free, works in the browser with no signup, and can be embedded on any teacher's site or LMS.
Our mission
To make high-quality, interactive science and math learning free for everyone, so that understanding a concept never depends on what you can afford.
Our vision
A world where every student and teacher can learn any concept by exploring it directly, not just reading about it.
What we make
- Interactive lessons across math, chemistry, physics, biology, and earth science.
- A clickable reference for all 118 chemical elements.
- Free, embeddable widgets teachers and creators can drop into their own pages.
PrepOK is built for teachers, students, parents, and the curious. Everything is free to use and free to embed.