Our goal
The best interactive learning tools usually sit behind subscriptions. We think that’s backwards. A student with a phone and curiosity should get the same lessons as anyone else: hands-on, carefully explained, insightful and visual.
About OpenAha
Learning should be free.
Understanding should be fun.
OpenAha exists to give everyone high-quality, interactive education in math and science, for free. Not just the people who can afford it.
142courses
1,053lessons
6,571interactive steps
Freefor everyone, always
How it works
Every lesson asks you to predict, drag, build or solve before it explains. You get instant feedback, a “Why?” behind every answer, and live simulations you can push and probe until the idea clicks.
No barriers
No account, no paywall, no ads. Your progress, XP and streak are saved only in your own browser, on your device.
Help make it better
AI tools helped us build this many lessons quickly. What turns a good lesson into a great one is human insight: the moment a step confused you, a clearer example, a mistake only a careful reader spots. OpenAha is open source, and every suggestion is read.
- In a lesson, tap the flag at the top. Your suggestion arrives with the exact step it’s about.
- Beginners: your confusion is the most valuable feedback there is. Experts no longer notice the gaps.
- Teachers: tell us what would make a lesson work in your classroom, or which topic is missing.
Want to use OpenAha in your school, help translate it, or partner with us? Or have something you’d rather not post publicly? Write to contact@openaha.org.