According to Clive Sinclair, purchasers of the ZX81 came from "a reasonably broad spectrum" that ranged from readers of the upmarket Observer and Sunday Times newspapers to the more downmarket but numerous Sun readers.
Segundo Clive Sinclair, os compradores do ZX81 eran "dun espectro razoablemente ancho" que variaban de lectores dos refinados Observer e Sunday Times ós do máis barato The Sun.