A few years after leaving grad school, I tried picking math back up. The textbook experience was as bad as I remembered — no feedback, no way to ask questions, no one to help when you were stuck.

Private tutoring is the real solution, and it worked for me as a kid — it built confidence in a way class never did. But it's expensive. I wanted to build something that could give that experience to anyone.

The design challenge I cared most about: don't let AI become a homework machine. The whole point of learning math is developing the ability to think through hard problems. So Marcus is built to guide, not solve — it asks questions, gives hints, and explains step by step, but doesn't hand you answers.

It covers K–12 through college-level math (linear algebra, calc, etc.), adapts to what you know, and tries to be the patient tutor most people never had access to.

Would love feedback, especially from students or educators.