Preselected opt-in

A preselected opt-in does its work before the reader arrives. The box is ticked, the insurance is added, the partner list is joined, and the only thing standing between that and a completed sale is whether anyone notices in the two seconds they spend on the step. Nothing has to be hidden, because defaults are not read as choices. They are read as the state of the world, and most people accept the state of the world and press Continue.

The power of it is well measured. Johnson and Goldstein’s 2003 comparison of organ donor registration found participation differing by tens of percentage points between countries whose only real difference was whether the form started ticked. That research is usually cited to argue for good defaults, and it is the same finding either way: whoever sets the default writes most of the answers. A preselection is that instrument turned around, and the tell is who benefits. A prefilled delivery address saves the reader a step. A prechecked travel insurance line at twelve pounds saves the seller a conversation.

This is the exact line smart defaults draws, and it is worth keeping sharp, because the two are indistinguishable in a screenshot and opposite in intent. A default that serves the reader’s likely intent is good design and costs nothing to change. A preselection that spends money, shares data, or signs someone up serves the party who wrote it, which is why it sits in the dark pattern catalogue at deceptive.design as its own named type. Three questions separate them reliably: who gains, what does the default cost if it is wrong, and would you be comfortable saying it out loud on the screen.

In Europe the argument is already settled in law. Consent under the GDPR has to be a freely given, specific, informed and unambiguous act, and the Court of Justice said plainly in the 2019 Planet49 ruling that a pre-ticked box is not consent at all. The practical rule is short. Anything that is consent, and anything that costs money, starts off. Say what the option does in the row rather than in a linked policy. And if the offer genuinely is a good deal, it will survive being presented as a question.