You send emails to thousands of people who all look the same in your ESP.
Same list. Same segments. The same campaigns go out to anyone who has purchased a moisturizer in the last 90 days. And yet, somewhere in that list, there is the customer who bought it for dry skin, the customer who bought it as a gift, and the customer who has struggled with a particular skin condition for years.
Three completely different people. A general email.
This is the gap that zero-party data closes.
Unlike behavioral data, which draws conclusions about what people want by observing what they click, zero-party data is information your subscribers give you directly. They tell you your skin type. Your budget. Your biggest challenge. They prefer to hear from you twice a week or once a month. No guesswork. No conclusion. Just answers.
And once you have those answers, you can create email programs that feel less like a broadcast and more like a conversation.
Do you have little time? Here are the key takeaways
- Zero-party data is given, not derived: Your subscribers tell you directly what they want, making your targeting more precise and your emails more relevant.
- Quizzes are the survey instrument with the greatest impact: A well-constructed quiz captures intent, preference, and context all at once, in a format that people actually enjoy taking.
- Surveys close the gaps: Post-purchase surveys and one-on-one emails provide insights that your analytics will never show you.
- Preference Centers put subscribers in control: When people can manage what and how often they receive, they are less likely to unsubscribe and more engaged.
- The data is only as good as what you do with it: Collecting zero-party data without appropriate measures is just filling out forms.
What is zero-party data (and why is everyone talking about it)?
The term was coined by Forrester Research and describes data that customers intentionally and proactively share in exchange for something they value.
It’s in a different category than the data you’re probably already collecting.
First-party data is behavioral data: purchase history, browsing activity, email clicks. It tells you what people have done, and from that you can then infer what they want. With zero-party data, the inference step is skipped entirely. If someone takes a skincare quiz and tells you they have oily skin and are looking for a daily routine for under $50, you don’t have to guess. You already know.
This is more important than ever right now. Third-party cookies are effectively excluded. Tracking restrictions from Apple and Google have made first-party data harder to read. The brands that develop persistent, personalized email programs do so based on information their subscribers want to share, rather than information tacitly gleaned from their browsing habits.
Zero-party data doesn’t just make your emails more relevant. It makes the whole relationship more honest.
Quiz: The Highest Yield Data Collection Tool You’re Probably Underutilizing
A good quiz does three things at once.
It collects structured data that you can act on. It creates an immersive experience that feels more like value addition than data extraction. And it gives you a natural segmentation point before someone makes a purchase.
The last part is worth a pause. Most email personalization occurs after the first purchase, when you know what someone bought. With a pre-purchase quiz, you can personalize from the first email, before a transaction occurs, based on the information someone has provided you.
The format is straightforward. Someone lands on your website, is asked to take a quiz, answers five to eight questions, and lands on a results page with personalized recommendations. Meanwhile, their responses are fed directly into your email platform, triggering a segmented welcome flow tailored to exactly what they told you.
What separates a powerful quiz from a progress bar form is, first and foremost, intent. People take tests because they want a result, not because they want to answer questions. Therefore, every question needs to feel like it is leading them to a better recommendation. If the results page is not really useful, the whole exercise fails.
The other thing worth doing right is mapping. Every reply should make a difference on your email platform. If “I have oily skin” doesn’t trigger a different flow than “I have dry skin,” you’ve collected data you’re not using. And if your quiz has more than eight questions, you’ll lose people before they’re finished.
Platforms like Omnisend allow you to share quiz data directly with subscriber profiles, meaning the answers someone gives on day one can still drive personalization six months later.
Surveys: This is how you continue to learn even after the first sale
Quizzes work best at the top of the funnel. Surveys do something different. They close the gaps left by purchase data.
A post-purchase survey sent 24 to 48 hours after delivery is one of the most underused tools in the eCommerce email space. Not an isolated NPS value, but specific questions: Why did you buy this? What did you hope to achieve from it? How did you find us?
The answers tell you things your analytics could never say.
You may find that 40% of people who purchased your supplement bought it as a gift. This is a segment you didn’t know you had, and it changes everything about how you market to them. The re-engagement email you would send to a repeat buyer who wants it for themselves is completely different than the email you would send to someone who bought it for their mother’s birthday.
It’s also worth adding preference check-ins to your calendar, which will be sent to your existing list every few months. Ask how often subscribers want to hear from you, what content they find most useful, and whether their needs have changed. It reduces unsubscribes and shows you where your content is going.
And don’t underestimate the one-question email. One question, two or three possible answers, the answer flows directly into your profile. Low friction, surprisingly high response rate and truly one of the most underrated formats in email marketing.
Preference Centers: Giving your subscribers control creates trust you can rely on
Most eCommerce brands consider the unsubscribe link as the only exit option.
This is a mistake.
There’s a broad middle ground between “I want every email you send” and “Remove me from everything.” A preference center lives in this room. This allows subscribers to tell you exactly what they want to receive and how often, rather than forcing them to make an all-or-nothing decision.
The difference in engagement is significant. Someone who manages their preferences is actively investing in the relationship. They don’t tolerate your emails. You curate them.
A preference center should at least allow subscribers to choose their topics, their frequency and, ideally, their format. The mechanics don’t have to be complicated. But the option must be there and easy to find. Link to it in every email, not just in the footer. The subscribers who update their preferences give you data and signal that they want to stay. It’s worth making both things easy.
Turn the data into email programs that actually convert
Collecting zero-party data is the easy part. The harder question is what to do with it.
Any data you collect should be associated with a specific segment, flow, or content decision. If this doesn’t change what someone gets or when they get it, then you’re collecting it for no reason.
Quiz answers should feed segmented greeting streams. Someone who identifies as a complete beginner will go through a different onboarding sequence than someone who has been running paid ads for three years. Both are on your list. No one should receive the same emails.
Survey responses should update profiles and shape future communications. If someone says in a post-purchase survey that they were disappointed with delivery times, it’s not just product feedback. It’s worth incorporating context into the next email you send them.
And by combining zero-party data with first-party signals, you get the most comprehensive picture. What someone told you they wanted, coupled with what they actually bought and clicked on, is more useful than either source alone.
This is where Omnisend does its best work. The ability to store custom properties at the subscriber level, create dynamic segments from those properties, and trigger automations based on specific responses makes zero-party data actionable at scale, rather than sitting in a table that no one looks at.
Final thoughts
The brands that win in email in the next few years won’t be the ones with the biggest lists.
They will be the ones with the most useful subscriber data and the systems to act on it.
Zero-party data gives you something paid acquisition and behavioral tracking can’t: a subscriber who’s told you what they need. A quiz answer. A survey response. A preference that they have actively chosen. This isn’t just marketing data. It’s a signal that someone trusts you enough to tell you the truth about their desires.
Build the tools to collect it. Create the flows to use them. And treat the information your subscribers give you with the respect it deserves.
This is where Omnisend comes into play. With custom properties, quiz integrations, dynamic segmentation, and automation tools that respond to subscriber-level data, you get the infrastructure to turn what people tell you into emails they actually want to open.
And if you’re currently on a different platform, switching will cost less than you think. In five days, Omnisend’s migration team will move any flow, list, and template at no cost to you. You just show up when it’s ready. Same power as the big players, with SMS now starting at $0.007, which for most founders means up to 35% less than you’re currently paying.
Foundr readers also get 50% off their first three months. Use code FOUNDER50 when you sign up and start building an email program that deserves its place in your inbox.
