Gramatika is a Chrome extension that serves as a writing assistant for the Indonesian language. It helps users write using the correct spelling and grammar rules based on the Indonesian Spelling Standard (KBBI) and Kateglo. By simply selecting text, users can check and correct any grammatical errors in Indonesian, ensuring adherence to the correct spelling rules. Additionally, the extension also provides a KBBI mode which allows users to view the definitions of each word directly from the KBBI.