Contact
There is no form — the site is static, and a form would collect personal data nobody needs. An email is enough. So that it reaches the right mailbox, this page is sorted by what you want.
A figure is wrong
The most useful message we can get. Corrections are checked and dated — including those from vendors, with nothing given in return. Helpful: a link to where the figure appears, and the source that establishes the correct one.
Being added to the comparison
Vendors who are missing are welcome to get in touch. A place in the table cannot be bought and inclusion is not a recommendation — the same research applies as to everyone else. Useful: the product page, a price or the statement that none is published, and the category the product belongs in.