Are there any good example UIs for drawing some thing that is almost always square vector graphics on mobile? I have not found a good way to do that, I usually

Are there any good example UIs for drawing some thing that is almost always square vector graphics on mobile? I have not found a good way to do that, I usually add houses at home with a desktop, it's soo much faster and precise with a mouse for me. Then I add more data with the Streetcomplete app when I'm on the go.