The CAT — Costo Anual Total (Total Annual Cost) — shows the real yearly cost of a loan, including not only the interest rate but also origination, administration and other mandatory fees. It is regulated by Banxico so you can compare transparently.
Why compare by CAT, not by the rate
Two loans with the same interest rate can have very different total costs because of fees. The CAT brings them to the same basis.
On Kreditano, offers are sorted by ascending CAT by default — the cheapest is first.