I heard that finding names for projects is "the hardest thing in development, after cache invaliadation". And that's right.
"Site compare" was a bad name because of two things: it compares sites, that's true. But it does not compare sites. So that's false.
"Capyxel"? After all, that does not mean anything, but it's about Capybara and pixels. Without being too obvious. So why not?