I made a free, open source alternative to Brilliant (140+ interactive math and science courses)

Hey everyone! I really like how websites like Brilliant teach: you try things first, explanation after. But it’s like $160 (or more depending on the region) a year, so I’ve been making a free one. It’s called OpenAha. right now there’s 140+ courses and 1000+ lessons in math, physics and chemistry. no account or bs. Honest heads up before you click: Almost all of it is written with Claude. I planned the courses abstractly, but so far only about one third of the pages have been carefully reviewed by a person. It’s not finished and there will be mistakes or courses that are badly structured. That’s actually why I’m posting here. I want a free alternative to Brilliant to exist, and with the limited time one person has, a community driven model is the way I’ve chosen to make it happen. Every step in a lesson has a flag button. a report opens an issue on github and the fix happens in public. A few to try if you only have a minute: - draw a square or a star with nothing but spinning circles (Fourier series): https://openaha.org/courses/fourier/epicycles/?step=3 [https://openaha.org/courses/fourier/epicycles/?step=3] - basics of calculus (integrals): https://openaha.org/courses/integrals/riemann/?step=3 [https://openaha.org/courses/integrals/riemann/?step=3] - watch a polynomial wrap itself around sin x as you add terms: https://openaha.org/courses/taylor/famous/?step=2 [https://openaha.org/courses/taylor/famous/?step=2] - program a little robot: https://openaha.org/courses/coding/sequence/?step=6 [https://openaha.org/courses/coding/sequence/?step=6] - two pendulums passing energy back and forth: https://openaha.org/courses/waves/coupled/?step=3 [https://openaha.org/courses/waves/coupled/?step=3] Some things people asked me before: - License: the code is MIT, the lessons are CC BY-SA 4.0 (same as wikipedia). anyone can reuse them, even Khan Academy, as long as they keep them open. - What if you stop? It’s a static site. If I ever stop, anyone can fork the repo and keep it going, lessons included. That’s kind of the point of making it open source. - Is it a copy of Brilliant? No. not affiliated, none of their content, I don’t even have an account. They just use the style of learning I liked. If you know a subject well and want to check a course, I’d really appreciate it. Teachers and homeschoolers, I’d love to hear what works and what doesn’t. Translations are on my list too, but they need people to check the tone. code: https://github.com/open-aha/open-aha.github.io [https://github.com/open-aha/open-aha.github.io]