The MyTANITA app automatically uses the system language of your phone. When the system language of your phone is not available, the MyTANITA app will be shown in English.

On iPhones you can change the language of the app by going to the phone's settings, then to 'Apps' then to 'MyTANITA' and there you can manually select your preferred language from the available options.

Here you can see which languages are available in the MyTANITA app: Which languages are supported in the My TANITA Healthcare app?