LanGuard is a Chrome add-on developed by Cyan that aims to promote digital well-being by automatically detecting and filtering profanity and slang. This program detects and replaces offensive words with filtered alternatives, encouraging users to communicate in a more respectful manner. LanGuard is designed to work with both Korean and English languages, targeting major profanity and slang terms commonly used in these languages.

LanGuard operates within text input and search boxes, providing a real-time filtering mechanism to ensure a cleaner and more positive online experience. However, it's important to note that due to the dynamic nature of websites, the program may not function perfectly on all sites. Despite this limitation, LanGuard offers a valuable tool for individuals who wish to maintain a more respectful and considerate online presence.