Liner is an AI search engine built for students, researchers, and knowledge workers who need answers they can trust. Founded in 2012 as a web highlighter and rebuilt around large language models after GPT-3, the company now serves roughly 12 million monthly users across more than 200 countries, pairing conversational answers with transparent citations from academic papers and vetted sources. Headquartered in San Francisco with roots in Seoul, Liner positions itself as a source-grounded alternative to general chatbots and to Google's search box.

YouLearn is an AI-powered personalized tutoring platform built by students, for students. Founded by three college friends frustrated with outdated lecture videos and generic AI tools, YouLearn transforms any learning material - PDFs, YouTube videos, lecture slides, even photos - into concise notes, adaptive quizzes, and an interactive AI tutor. With 2M+ users globally, $770K ARR, and backing from Y Combinator's Spring 2025 batch, YouLearn is building what they call a modern-day Aristotle: a lifelong AI tutor that grows alongside each student.