Opti

Exam prep for the ESAT, the admissions test for engineering and sciences at UK universities.

Students work through past papers. A retrieval pipeline finds the right questions. A gate locks the answer until you show you understand. Mistakes come back through spaced repetition.

I co-founded it and I am the developer. My co-founder handles distribution.

Stack: Next.js, Supabase with pgvector, Voyage AI embeddings, Prisma, Claude API, Cloudflare Pages, Lemon Squeezy, PostHog.