Default Effect
A preselected option or existing state can be chosen more often because it remains in place unless someone actively changes it.
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How teams put it to work.
Examples identified in our interface teardowns, linked back to the full product journey.

Name and phone values are pre-filled while remaining editable. These values function as defaults if Next saves them unchanged; the screenshot does not show acceptance, correction or error rates.
View Uber account setup: data use, marketing and advertising choices →
Activating search places focus in the field and opens the keyboard. This is the default input state for text entry; the screenshot does not show whether it improves task speed or excludes another preferred input method.
View Spotify search: browsing, history, mixed results and format filters →
Both notification categories start off, Save is unavailable until a choice changes and Not now remains visible. These are observable defaults that preserve non-subscription; the screenshot does not show whether people keep or later change them.
View Headspace onboarding: account creation, wellbeing claims, trial offers and a first exercise →
The later trial screen again preselects Annual and pairs immediate free access with a future £49.99 charge. The visible default is supportable; the screenshot does not establish temporal discounting and does not reconcile the earlier 30% offer.
View Headspace onboarding: account creation, wellbeing claims, trial offers and a first exercise →
Relevance, All and Any time are visibly preselected and will define the result set unless changed. These are interface defaults; the screenshot does not show whether people keep them or whether they produce the best result for a task.
View YouTube search: history, suggestions, sponsored results and filters →
Annual is visibly selected before the person acts, while Monthly is available but its price is hidden. This is an actual interface default; the screenshot does not show acceptance, and informed choice requires both plans and renewal terms to be equally comparable.
View Headspace onboarding: account creation, wellbeing claims, trial offers and a first exercise →