Affinity Designer is the First Professional-Level Vector Graphics and Art App for the iPad

Serif’s Affinity Designer for iPad has all the features of a desktop vector art tool – but you can draw directly on it with the Apple Pencil for the most natural way of creating.
https://www.digitalartsonline.co.uk/news/illustration/affinity-designer-is-first-professional-level-vector-graphics-art-app-for-ipad/