the.com/freemium
free enough to hook you, premium enough to profit off your habit.
means a business model where the basic product is free but the useful parts cost money.
from coined around 2006 by venture capitalist fred wilson, blending free and premium, though jarid lukin gets credit for the actual word.
conversion ratetypically only 2 to 5 percent ever pay
classic examplespotify, dropbox, linkedin all rely on it
psychological tricksunk cost from free use nudges upgrades