A hard inquiry shows up when you formally apply for credit and the lender pulls your file at Buró de Crédito (Mexico's credit bureau) — it drops your score 5-15 points temporarily and stays visible for 24 months. A soft inquiry is informational only (pre-qualification, your own check) and doesn't affect your score or show up to other lenders. Comparing offers on sites like this one does not trigger a hard inquiry.
Hard inquiry: the one a bank makes when you apply for formal credit. It leaves a mark, and several in a short window lower your score, because it looks like you're desperately hunting for money. Soft inquiry: when you check your own report or a marketing pre-approval — it leaves no mark and affects nothing.
That's why moving filters in a comparator, simulating payments or pulling your report doesn't touch your Buró; the hard mark only appears when you sign the formal application with the bank or SOFOM. The tip: when shopping for credit, concentrate your applications in a short two-week window — models usually count several same-type inquiries in that period as one.