Hi Sefert, We have experience writing visual screen based SRS for mobile apps for iOS, Android, Windows, BlackBerry and Nokia. Please check PM for the different formats of SRS that we can create for mobile apps, I can share the sample of the different kinds of SRS as well if needed. (for your information: we also do the app development so we not only have the business level understanding but we also understand how to write the technical implementation part of it) Please check PM for further details, Best regards, Ankit CDN Mobile Solutions, India.