I built 59 free browser-based dev tools in vanilla JS — here's what I learned

Antigravity Tools offers 59 free browser-based developer utilities built with vanilla JS, ensuring zero dependencies, servers, or telemetry. By utilizing native APIs like Web Crypto API, Canvas API, and IndexedDB, all operations run locally. Similarly, Utility Tools Lab provides seven encryption tools, including the AES File Encryptor, which uses AES-256-GCM and PBKDF2. Both platforms prioritize privacy by processing sensitive data, such as private keys and encrypted backups, entirely within the browser to prevent server uploads.