Char counter for N予備校 is a free Chrome add-on developed by tsutoringo. It is designed to show the number of letters in the text at N予備校, a popular online learning platform. This add-on adds a character counter below the input field in N予備校's reports and tests, allowing users to easily track the number of characters they have typed. It is a useful tool for students who need to meet specific character limits in their assignments or exams.

Please note that this add-on may not be applicable to all questions or assignments on N予備校, so users should exercise their own judgment when using it. Overall, Char counter for N予備校 provides a convenient feature for N予備校 users, helping them keep track of the number of characters in their text.