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
LinkedIn Formatter
Unicode bold, italic, mono and bullet styles for standout LinkedIn posts
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