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US full-service carriers (Delta, United, American, Alaska, Hawaiian, JetBlue) and Southwest generally include a full-size carry-on and a personal item free on every fare, with no published weight limit. US budget carriers (Spirit, Frontier, Allegiant) only include the smaller personal item for free — a full-size carry-on is a paid add-on, and it's cheaper to add it during booking than at the gate.
European budget carriers (Ryanair, easyJet, Wizz Air) go a step further: they enforce actual weight limits on the cabin bag (not just size), and are known for strict gate sizers that catch oversized or overweight bags — expect a higher fee if you get caught out versus paying in advance.