OmniAppHub is a small collection of free, single-purpose learning tools and games that run entirely in your browser: chess coordinate and tactical-vision trainers, mad minute math, piano ear training, Python syntax flashcards, no-spend and savings-goal trackers, a debt-payoff visualizer, a two-investor compound-interest race, a savings-boost what-if visualizer, a bear-market survival game, a mental tip-calculation sprint, a percentage discount speed drill, a workout quest tracker, a bodyweight p