DopaSprint is an ADHD-friendly productivity app built by Keith Li, a Hong Kong-based Vibe Coding pioneer who has taught at universities since 2014. The core loop is Brain Dump → Sort → Pick One Priority → Sprint → Review. The timer counts up, not down, to remove anxiety. Guard rails and a configurable hard stop prevent hyperfocus burnout. Free tier: 50 active tasks, 50 AI credits per month, no credit card. Founded February 2026.