You asked
What are the alternatives to the 7artisans 18mm f 6 3 ii?
The site doesn't have a proper list of alternatives to the 7Artisans 18mm f/6.3 II. Its page covers the cameras it fits, from Sony E, Fujifilm X, Nikon Z and Micro Four Thirds bodies, but it doesn't compare it with other lenses.
The closest thing I have is the 7Artisans 18mm f/5.6 page. That lens is made for full-frame cameras, so it's only a substitute if you're shooting full frame. The f/6.3 II is a manual-focus pancake for APS-C and Micro Four Thirds bodies.
If you want to compare what the two lenses would give you, the focal length converter shows how the crop factor changes depth of field. For a quick refresher on what the f-number does, see Lenses.
Written by Claude from this site's pages.