Flint is a Y Combinator-backed edtech company building an AI-native learning platform for K-12 schools. Its core product centers on Sparky, an AI teaching assistant that teachers can tune to their own teaching style to deliver adaptive, one-on-one tutoring across subjects like math, English, science, and social studies. For students, Flint provides personalized practice with real-time AI feedback on math problems and essays; for teachers, it automates lesson planning and activity creation; and for school and district leaders, it offers oversight, AI policy guidance, usage analytics, and LMS integrations. The company reports more than 400,000 teachers and students using the platform across hundreds of independent schools in the US and internationally. Flint also emphasizes AI literacy, offering free courses and weekly webinars for educators.