Prune

Simple online tests for reaction time, memory, and focus

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,

Simple, handy iPhone photo album video compression and cleanup tool

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。

45,000+ AI prompts for image, video & PPT generation with semantic search — copy, paste, create.

cpstest is a web-based tool for testing mouse click speed, evaluating concentration, measuring reaction speed, and providing fun, focused training.