AI personalization for e-commerce

Personalization Without Cookies: What First-Party Data Actually Replaces

Third-party cookies are going away. The replacement is not a new tracker, it is the data your customers already gave you.

First-party data, your own purchase history, browse behavior, and email engagement, replaces third-party cookies for personalization, and zero-party data, the preferences customers declare directly, fills the gaps. The stores doing this well remember their customers: 83 percent of shoppers want retailers to remember them.

What third-party cookies actually did

Third-party cookies let one company follow a shopper across many sites, and personalization tools used that trail to guess what the shopper wanted. The guess was often wrong, and the trail was the problem: shoppers did not know it existed, did not consent to it, and could not see it. Browsers are shutting it down, and the stores that built their personalization on it are rebuilding.

The replacement is not a cleverer tracker. It is the data you already have, the data the shopper gave you on purpose, and the data you earn by asking. That sounds like less data, and it is. It is also better data, because it comes from your own store, about your own customers, and it is the kind of data that actually predicts what someone will buy next.

First-party data: the record you already own

First-party data is everything a customer does on your property: what they bought, what they browsed, what they searched for, which emails they opened, and what they put in the cart and left there. Shopify's unified customer profiles pull this together into one record per customer, so the storefront, the email tool, and the checkout all see the same person.

The strength of first-party data is that it is behavioral, not demographic. You are not guessing that a 35-year-old likes a product. You know this customer bought it twice, browsed the matching accessory three times, and opened the email about the new color. That record is also yours in a way a cookie trail never was: nobody can take it away with a browser update.

Zero-party data: asking instead of inferring

Zero-party data is what the customer tells you directly: the quiz answer, the preference center choice, the declared interest. A shopper who says they want running shoes in size 10, in black, under $120, has given you a better targeting signal than any amount of browsing history. The data is accurate because it was volunteered, and it is consented because the customer chose to share it.

The exchange has to be fair. A quiz that asks twenty questions and gives nothing back gets abandoned. A quiz that asks three questions and returns a matched product gets completed. The shopper is not filling out a form, they are trading answers for a better recommendation, and the trade only works if the recommendation is visibly better.

The line between remembering and creeping

Amperity's 2026 research found 83 percent of customers want retailers to remember them. Attentive found 71 percent of shoppers take action to protect their privacy. Both numbers are true at once, and the gap between them is the line. Shoppers want to be remembered by the store they chose. They do not want to be followed by a store they never visited.

The practical rule is to personalize from data the customer can see the source of. A recommendation based on their last purchase feels helpful. A recommendation based on a site they visited yesterday feels like surveillance. First-party and zero-party data stay on the right side of that line, because the customer can trace every recommendation back to something they did with you.

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Frequently asked questions

What is first-party data?

Data a customer generates on your own property: purchase history, browse behavior, search queries, email engagement, and cart activity. It is yours, it is behavioral rather than demographic, and no browser update can take it away.

What is zero-party data?

Data a customer gives you directly and willingly: quiz answers, preference center choices, and declared interests. It is more accurate than inferred data because the customer stated it themselves.

Can I personalize without any cookies?

Yes. First-party data and zero-party data do not need third-party cookies, and a logged-in customer or a loyalty account can carry personalization across sessions without any tracking cookie at all.

Do shoppers actually want personalization?

Amperity's 2026 research found 83 percent of customers want retailers to remember them. The catch is that 71 percent also take action to protect their privacy, so the personalization has to come from data they knowingly shared with you.