Every touchpoint... one ID

COREid® is the industry’s most accurate, stable and scalable source of identity resolution. Each COREid represents one real person, not a device, cookie or email. Built on verified name and address data it connects every interaction back to a single identity, eliminating duplication, cutting waste and revealing a truer picture of your customers.

Fill the gaps in your customer data

For over a decade, Epsilon has strengthened COREid through trusted publisher partnerships and continuous validation. This creates a live, ever-expanding network that can identify and reach real people at scale.

COREid underpins all Epsilon products, enabling brands to recognise, reach and measure individuals with precision and prove outcomes, not just intent.

Activate and measure with a complete picture of connected identity

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Resolves to real people

COREid applies AI-driven identity resolution to create one pseudonymised profile per person, connecting them across browsers, devices and channels. The result is cleaner data, better frequency control and less media waste.

A man and woman biking in an autumn forest, overlaid with a digital ad for cycling watches and a "Verified purchaser" banner.

Activates everywhere

Once resolved, each COREid powers personalisation and performance across every channel — display, video, CTV, social, audio and in-store — enabling 1:1 conversations everywhere customers interact with your brand.

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Measures real outcomes

With closed-loop attribution built in, COREid connects exposure to verified sales and engagement data. That means you can see the real business impact of every impression and continually refine what drives results.

How COREid is different

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Protecting privacy comes first

Epsilon has a trusted, 50+ year legacy of protecting privacy.

Epsilon has a trusted, 50+ year legacy of protecting privacy. We exceed consumer, client and regulatory expectations for privacy and data stewardship.

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Unrivaled accuracy at an individual level

COREid is the only identity resolution solution that requires a complete name and address validated by transactions.

COREid is the only identity resolution solution that requires a complete name and address validated by transactions. That's how we ensure marketers reach the right person with maximum precision and efficiency.

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Seamless connectivity, online and offline

Our single source of identity resolution enables consistent 1:1 conversations everywhere consumers interact with your brand.

Our single source of identity resolution enables consistent 1:1 conversations everywhere consumers interact with your brand. All while maintaining rigorous data separation and privacy protocols.

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An industry-verified complete solution

Epsilon’s COREid was the only identity solution to capture all nine of the potential identifiers outlined in Digiday’s “A guide to the top ID alternatives for publishers” report. COREid’s strong offline and online foundation ensures persistency, efficiency, and more accurate reach.

Learn more

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Every touchpoint... one ID

Fill the gaps in your customer data

COREid underpins all Epsilon products, enabling brands to recognise, reach and measure individuals with precision and prove outcomes, not just intent.

An industry-verified complete solution