Vectornator

From vectornator.io

Available on Mac, iOS, iPadOS

Vectornator is a free, fully featured Adobe Illustrator-style vector-drawing and editing app, and the developers say it’ll remain completely free until they work out how or if they’re going to make money from it. No matter what kind of Apple device you design with, you’ll love using Vectornator on it – but, be warned, older Macs can’t join the Vectornator party, as you need macOS 11 Big Sur or later to use it.