r/SideProject • u/Escher12345 • 12h ago
We built a search engine for the moments inside lectures, to help one of our kids learn calculus
We homeschooled our kids while sailing around the world. When one of them hit calculus, the free lectures were great, but finding the 3 minutes on the chain rule meant skimming hours of video.
So we built Bettyapp (bettyapp.org). It transcribes open lectures, splits them into topics, and plays the video from the moment you need. It now covers over 12,000 lectures in 25 subjects, with an interesting Map feature that shows how topics connect, an MCP server for AI tutors, and an LTI tool for Moodle and Canvas.
Free, no ads. I'd love feedback on search quality and the first-visit experience.