https://inkscape.org/

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The design process may begin by doodles on a napkin, a sketched mindmap, a photo of a memorable object, or a mockup in software which really wouldn't work to complete the project. Inkscape can take you from this stage to a final, professional-grade design format which is ready for publication on the web or in physical form.

I love Inkscape and its flexibility. its great for anyone who wants high quality graphics no matter what they want it for. This is a programme that really delivers. This is my go-too!

I was asked recently if there was a way of getting Inkscape onto an Ipad and found an adapted version of Inkscape for iPhone and iPad in the App store,

https://apps.apple.com/us/app/xinkplus-graphics-editor/id1076862403 

There currently (April 2021) doesn't yet seem to be an android version.