Labs
Explore interactive learning experiences and testing tools
Kids Learning
Interactive games and learning activities for kids
Quizzes
Test your knowledge with interactive quizzes
UUID Generator
Generate UUIDs online — v1, v4, v7 with code examples in JS, Python, Java, Kotlin, Go, Rust
JWT Decoder
Decode & encode JSON Web Tokens. Supports HS256, RS256, ES256 with validation and code examples
Toolbox
Handy daily-use utilities: age calculator, UUID generator, GZip tool and more
Text Formatter
Fancy Unicode text styles, case conversion, and line tools for LinkedIn, X, and Instagram
Mind Map
Turn markdown outlines into visual mind maps — horizontal, vertical, or radial
Fun Puzzles
Mind-bending puzzles for all ages — sliding tiles, word scrambles, memory patterns and number sequences
Tech Simulators
Interactive system design simulations — Kafka, rate limiters, caching playground