My experience with the function is limited, but I think it’s decent. Markdown support, import from websites etc. If you add the items to the recipe with their amounts and then write them out in the text it automatically give you the amount you need based on the portions specified.
On app.kitchenowl.org you can create a demo-user and household. Within that, you can try the recipe function. Sign up requires a mail-address, but it does not need to be a valid one.
All the elitism and jokes aside, dub has come a long way in the last 20 years. Sub is still the better IMHO, but dubs are no longer something you have to actively tolerate.