Code Testing
6 free online code testing. No signup required.
Free Grammar Checker - AI Error Explanation
Free AI grammar checker that not only corrects your English but explains why it's wrong. Perfect for learning proper grammar rules.
Free Online Math Solver - Step-by-Step Solutions
Free online math solver with step-by-step solutions. Solve algebra, equations, fractions, and more. No signup required, instant results.
Free Online Timer & Stopwatch & Interval Trainer
Free online timer, stopwatch, and interval trainer. Pomodoro for work, Tabata/HIIT for fitness. No signup required. Privacy-first browser-based timing.
Free Text Diff Checker - Compare Text & Code Online
Free online text diff checker to compare text and code. Side-by-side view with syntax highlighting. Compare JSON, XML, code files and find differences.
JWT Decoder - Decode & Verify Tokens
Free JWT decoder. Decode tokens, inspect claims, verify signatures in your browser.
Regex Tester - Test Regular Expressions
Test regular expressions with real-time matching. Supports g, i, m, s flags. See match count and captured groups.