
Aperitivo is a light, bittersweet orange-red Italian aperitif, milder and lower-proof than red bitter liqueurs like Campari. At the lighter end the category sits below the EU’s 15% minimum for a liqueur, which is why those bottles are sold as bitter aperitifs rather than liqueurs.
The category is defined by being light: around 11–18% alcohol against a red bitter’s 20–28%, and correspondingly gentler. Reaching for something bitterer makes a stronger, harder drink, which is a decision about the spritz and not a repair to it.
Red bitter liqueur (e.g. Campari)
Campari and its kin run 20–28% against this 11–18% — close to twice the strength — and are distinctly more bitter. In a spritz the drink turns stronger and drier: pour about a third less and give the sweetness back with a barspoon of syrup.
Aperitivo (the ritual/category)
The word also names the whole pre-meal ritual, and the vermouth and wine inside it. A recipe naming aperitivo means the bottle. A recipe calling for "an aperitivo" makes a quite different drink on vermouth or sherry — in strength, sugar and color — so go by the bottle, not the word.

Aperol Spritz
Prosecco extra dry, Aperitivo

Naked & Famous
Mezcal, Herbal liqueur (e.g., Yellow Chartreuse), Aperitivo

Paper Plane
Bourbon, Amaro Nonino Quintessentia, Aperitivo

Sauvignon Blanc Punch
Sauvignon blanc wine

First Word
London dry gin

Golden Hour
Bourbon

Lost Plane
Dark rum, Aperitivo, Amaro

Wah-Wah
Pisco

Montreal Cocktail
London dry gin, Canadian rye whisky, Aperitivo, Gentian liqueur

Ruby
Vodka

Tommi’s Cocktail
Mezcal

Naked In The Rain
Mezcal