For years, marketers bought their way to an audience. Purchase a list, layer on a tracking pixel, guess at intent based on browsing history you didn't collect yourself. That's third-party data — information about people that a brand never actually asked for.
Zero-party data is the opposite. It's what a customer tells you directly, on purpose, because they chose to. Their skin type from a quiz. Their t-shirt size preference from a giveaway entry. What they're shopping for and why. No guessing, no buying, no tracking script required.
The gap between these two is turning into one of the biggest advantages a brand can build right now, and the data backs it up.
What zero-party data actually is
Zero-party data is any information a customer volunteers directly to your brand: quiz answers, survey responses, style or size preferences, stated purchase intent, their birthday, or their favorite product category. It's different from first-party data (behavior you observe, like what someone clicked or bought) and worlds apart from third-party data (information bought or scraped from outside sources you have no direct relationship with).
The key word is intentional. A customer filling out a "what's your skin type?" quiz knows exactly what they're sharing and why. That single fact changes everything about how useful — and how trustworthy — that data is.
Third-party data is losing its grip
Third-party cookies have been on a slow death march for years, and the walls are closing in faster now. Chrome, which still holds the majority of global browser share, has been phasing out third-party cookie support under its Privacy Sandbox initiative, following Safari and Firefox, which blocked them years ago. Regulations like GDPR and various U.S. state privacy laws keep tightening what brands can legally buy or infer about a stranger.
Beyond the legal risk, third-party data was never that accurate to begin with. It's inferred, aggregated, and often stale by the time it reaches an ad platform. Zero-party data has no such lag — the customer just told you, right now, what they want.
The numbers make the case
The shift toward zero-party data isn't a hunch, it's showing up clearly in the research:
Single Grain states that an Accenture study found 91% of consumers are more likely to shop with brands that give them relevant offers and recommendations based on preferences they've actually shared. Separately, 82% of consumers say they're willing to share personal data in exchange for a more customized shopping experience, and 88% of marketers have named zero-party data collection their top priority for the year.
The trust piece matters just as much as the willingness. Consumers are notably more comfortable with brands that collect data this way compared to brands that quietly track them, because there's no mystery about what's being collected or why. That comfort translates directly into stronger engagement: personalization built on zero-party data has been shown to significantly outperform personalization attempts built on third-party or inferred data.
Why this makes zero-party data more valuable, not just more available
- It's accurate. A customer telling you their preference is more reliable than a brand guessing based on browsing history. No inference, no stale cookies, no wrong assumptions.
- It's consent-based by design. There's no compliance gray area. The customer opted in, on purpose, which means the data is usable long after privacy rules tighten further.
- It builds the relationship, not just the targeting. A quiz or preference form isn't just data collection — it's a moment where a customer engages directly with your brand. That interaction alone builds familiarity that a purchased list never will.
- It gets better over time. Third-party data decays fast. Zero-party data can be refreshed any time a customer interacts with a new quiz, survey, or campaign, keeping the picture current instead of stale.
How brands actually collect it
This is where most brands stall out: zero-party data sounds great in theory, but asking customers to fill out a form for no reason doesn't work. It has to come with a fair trade: a giveaway entry, a personalized product match from a quiz, early access, a discount. Give someone a reason to tell you something, and they will.
That's the entire premise behind Drawbridge. Giveaways, quizzes, and interactive campaigns are built specifically to make sharing information feel like part of the experience, not a chore — so brands walk away with real preferences and intent data, given willingly, instead of a list bought from someone else.
The bottom line
Third-party data is getting harder to buy, harder to trust, and harder to justify. Zero-party data is the opposite: consumers are willing to share it, marketers say it's essential, and it builds a more accurate, more durable picture of a customer than any purchased list ever could. Brands that start collecting it directly now are building an advantage that only gets harder to catch up to.
