Description of OK.de Mail With the Android app for Ok.de you have the following convenience: – Your e-mail account is always there! – You can also use Free SMS and the OK Drive on mobile! So you are – no matter where – always well informed about what is happening at Ok.de. Just click on "Install" and go! We ask for your understanding that we currently do not remove any errors in the Ok.de app. We are working on a completely new design and improved layout of our website and thus also on a new app. It will not be long before we introduce our new app.