Dyma ap tywys dwyieithog Eisteddfod Genedlaethol yr Urdd. Mae disgrifiad o'r holl nodweddion wedi eu nodi isod. This is the Urdd National Eisteddfod bilingual guide app. A description of its features are detailed below. Mae'r ap wedi ei ddylunio ar gyfer ffôn symudol. The has been design to work on mobile phones.