Informative Nagari based on Android and IoS in Nagari VII Koto Talago, Guguk Sub-district, Limapuluh Kota Regency - Ganefri, Ganefri; Erianjoni, Erianjoni; Hasmira, Mira; Hadi, Ahmaddul; Yusra, Alfajri; Santi, Titen (Science and Environmental Journal for Postgraduate, 2022)