Zero-Party Data

0PD · Zero Party Data · Declared Data

Definition

Zero-party data is information a shopper voluntarily and knowingly gives a brand — through quizzes, surveys or preference settings — and it is used for immediate personalization when no behavioural history has accumulated yet.

What zero-party data is

Zero-party data is data a shopper knowingly and voluntarily passes to a brand. The operative word
is knowingly: the shopper either initiates the exchange or explicitly agrees to answer the
questions.

Examples:
– Quiz answers on a first visit (“What are you looking for?”, “What is your budget?”, “Who is it
for?”)
– Preference settings in the account area
– A profile form filled in at registration
– Choosing categories of interest in the app

Unlike first-party data (behaviour on the site) and third-party data (external data about a
person), zero-party data is the cleanest signal of intent there is: the shopper said out loud what
matters to them.

Why zero-party data matters now

Three forces are making zero-party data more valuable.

Third-party cookies are degrading. Browsers restrict third-party cookies and advertising
identifiers such as IDFA have moved to opt-in. There are simply fewer external data sources left.

Consent requirements keep rising. GDPR, CCPA and comparable regimes mean shoppers increasingly
expect control over their data. Zero-party data was collected with explicit consent to begin with.

Quality over quantity. One clearly stated interest — “I’m looking for running shoes, budget
$100–170” — is worth more than a hundred implicit browsing signals.

Zero-party data as the answer to cold start

The classic personalization problem: a new visitor with no behavioural history gets irrelevant
recommendations and leaves. Accumulating the first meaningful behavioural signals — five to ten
interactions — takes time.

Zero-party data closes that gap immediately:

New visitor →
  Quiz: "What are you after?" + "What size?" + "What budget?" →
  3 answers in 30 seconds →
  Personalized results from the first visit

Important: quiz completion rate falls sharply as the number of questions grows. Three or four
questions is the sweet spot. Every extra question costs you completions.

How zero-party data gets collected

Format	Where it is used	Typical scenario
Onboarding quiz	First visit, registration	“Help us pick the right products for you”
In-app survey	Mobile app	A short survey after the first purchase
Profile settings	Account area	Choosing interests, sizes, preferences
Conversational AI	AI Shopping Assistant	Clarifying questions during the search

Limits and data freshness

Zero-party data goes stale. Preferences stated a year ago may have nothing to do with what someone
needs today. Good practice is to offer the shopper a chance to refresh their profile periodically,
especially when their behaviour over the last 90 days has shifted — new browsing categories that
do not line up with the interests they declared.

Frequently asked questions

How is zero-party data different from first-party data?

First-party data is collected from what a shopper does on your own property — views, clicks, purchases — without their explicit participation. Zero-party data is what the shopper consciously provides: answering quiz questions, filling in a profile, setting preferences. Zero-party data reflects current intent more precisely; first-party data reflects real behaviour.

When does zero-party data matter most?

At cold start: a new visitor with no behavioural history. If they spend 30 seconds answering three quiz questions — “Who are you shopping for?”, “What is your budget?”, “Price or quality first?” — the personalization platform has enough to show relevant recommendations immediately, instead of waiting a week for clicks to accumulate.

How do you motivate shoppers to share zero-party data?

The governing principle is an explicit value exchange. “Answer three questions and get a personal shortlist.” The fewer the questions and the sooner the benefit is visible, the higher the quiz completion rate. Other levers include a discount for completing a profile, or personalized content unlocked only after preferences are set.

How quickly does zero-party data go stale?

Faster than you would expect. Preferences shift: a new baby changes which categories matter, a house move changes what someone needs for the home. Zero-party data has to be refreshed periodically — repeat quizzes, surveys, or an explicit prompt to update preferences. A model that relies only on the initial zero-party answers degrades over time.

Gravity Field

Zero-Party Data in Gravity Field

Gravity Field's AI Shopping Assistant uses quiz mechanics to collect zero-party data and start personalizing straight away. That matters most for new visitors with no behavioural history yet.

✦AI Shopping Assistant in quiz format: preferences collected inside the dialogue

✦Recommendations personalized straight from the shopper's own answers

✦CDP profile enriched with zero-party data for later segmentation

✦Cold-start coverage before behavioural signals accumulate

Explore the platform →