Immersion

Free ancient poetry calligraphy practice sheets, a great helper for both handwriting practice and learning

One brutal puzzle a day. Sharpen your brain in minutes.

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,

「哇声片场」是一款融合大模型技术的仿真配音与声音创作工具。

Simple online tests for reaction time, memory, and focus

自动识别公开牌面、追踪剩余牌，支持斗地主、跑得快、掼蛋，提供 iOS 与 Android 版本。