The Secret Scanner feature, now available in every Repl, uses AI-powered pattern recognition to identify potential secret values like API keys and tokens, warning users and offering the option to store them securely in the Secrets feature. The scanner runs client-side and encrypts data with AES-256 at rest, protecting against key compromise through regular rotation of encryption keys. This feature aims to help users protect their API keys and secrets while coding, even when using the Replit Mobile App, having already prevented over 500 instances of exposed secret values in open source code on Replit.com.