Procreate Pocket 3.0 is a raster graphics editor app for digital sketching, painting, and illustration.
Procreate Pocket is a stripped down version of the original Procreate app that was created for Apple's iPad. Procreate Pocket was made exclusively for the iPhone. In December of 2018, Procreate Pocket received Apple's App of the Year Award.
Mentioned in this answer
Procreate Pocket 3.0
The most versatile sketching, painting and illustration app