How SM-2 Spaced Repetition Powers Competitive Language Learning Apps Across the Full Stack

This implementation demonstrates how to build a Duolingo-competitive platform by leveraging the scientifically-validated SM-2 spaced repetition algorithm on a Deno backend with Flutter Web frontend. Centralizing complex scheduling logic in Edge Functions ensures testable, consistent behavior while maintaining a responsive user experience. The architecture provides a blueprint for education-focused startups to scale algorithmic sophistication alongside intuitive UI design.