Duolingo Unicode Normalizer is a free Chrome add-on developed by blmage. It falls under the category of Browsers and is listed as an Add-ons & Tools subcategory. This program is designed to automatically normalize Duolingo answers and dictionary searches.

Duolingo expects answers and word searches to be NFC-normalized strings, ensuring consistency and accurate results. However, depending on the input method, these values may contain decomposed characters, leading to differences from their normalized versions.

For example, the Vietnamese word "một" (one) can be written in at least three different ways, including "một" (NFC), "một" (VN keyboard), and "một" (NFD).

The Duolingo Unicode Normalizer extension aims to prevent false positives in typo detection and fix word searches by automatically normalizing relevant inputs. By doing so, it enhances the accuracy and reliability of Duolingo's language learning platform.