OSHINONAHA is a Chrome add-on that allows users to send texts of up to 800 characters for evaluation. By clicking on the icon, a text box appears where users can input their text. If an anonymized ES is sent, a free evaluation will be provided after a certain period. This tool provides a simple and convenient way for users to receive evaluations on their texts without revealing their identity.

Users can easily access the OSHINONAHA add-on on Chrome and utilize it to get feedback on their texts within the specified character limit. The feature of receiving a free evaluation adds value to this tool, making it beneficial for those seeking feedback on their written content.