KOLOR

Simple online tests for reaction time, memory, and focus

Web-based Tetris game supporting both mobile touch controls and PC keyboard operation.

Turn abstract probability and statistics concepts into visible, easy-to-understand content with fun interactive visual demos. Master core probabilistic thinking, and dive deep into classic theories including the Law of Large Numbers, Bayes' Theorem,

Real-time AI face swap for streaming & video calls, no GPU needed.

Track your daily energy consumption and replenishment, making energy management as simple as checking a dashboard.

Free, ad-free, locally run all-in-one online toolkit, the ultimate productivity booster for office work and development tasks.