Story

Daniel Martinez
Founder & CEO
- Y Combinator X25 founder
- Built VibeGrade — saved teachers 1000 school days
- Covered by Forbes
- Demitted from high school 3 credits short of diploma
Hi, I'm Daniel.
I won the highest academic achievement award in 8th grade. Then my high school kicked me out.
I had one semester left. Every remaining course was online. I told them I was leaving the country for three months to build my company. They demitted me anyway. Three credits short of a diploma.
For over a year I'd been asking my district to let teachers use AI to grade faster. Better feedback for students. Less burnout for teachers. I pitched 78 teachers at my school, including the one I'd watched grade 60 papers in a single evening. Not one replied. The district said it was "not a priority." I was 16.
I built it myself. Vibegrade. More than 12,000 teachers use it now. Forbes wrote about it. YC took me in. My school never said a word.
I don't think they could have. Saying anything would mean admitting the district was wrong to tell me no.
I got out. A lot of kids won't. School was a game I was good at until I started building things that actually mattered. That's why I'm building Units.
Not another tool to sell to districts. A school. AI isn't banned here. You can't fake your way through the work because the work is real: things you publish, ship, and defend in front of people who aren't your teacher.
By 2030, school as you know it won't exist.
— Daniel

