Yolk is a messaging app that only offers custom live stickers. 

Yolk is a messaging app that only offers custom live stickers. Users cannot type messages, but instead create and share segmented stickers based on what their iPhone camera captures (sorry, for now, Android). The app utilizes on-device artificial intelligence models, including object detection and face analyzation, to create and edit stickers from various photo elements. Yolk encourages users to share their creations in a feed or through direct messaging, facilitating one-to-one communication without the need for texting. (Tech Crunch)