[benjarrell]

What is used to create those images?

They look like whiteboard pictures but not quite.

[toja92]

I'm pretty sure it's Paper by 53, more information is available here: https://www.fiftythree.com/paper.

If you look at some of the screenshots on the site, you might notice some similarities.

[moatra]

Paper - https://www.fiftythree.com/paper