This book constitutes the refereed proceedings of the 7th Iberoamerican Conference on Applications and Usability of Interactive Television, jAUTI 2018, in Bernal, Argentina, in October 2018.The 13 full papers presented were carefully reviewed and selected from numerous submissions. The papers are organized in topical sections on Contexts of application of the IDTV; Design and Implementation Techniques of IDTV Content and Services; Interaction Techniques, Technologies and Accesibility of IDTV Services; Testing and User Experience of IDTV Services.