Lookalike Audience
A lookalike audience is a new group of prospects that an ad platform builds by finding people who resemble a source list of your existing customers or leads.
In depth
To create a lookalike, you upload or designate a seed audience, such as converted customers or high-scoring leads, and the platform analyzes shared traits like behavior, interests, and demographics to find similar users at scale. The quality of the output depends entirely on the quality of the seed: a small or noisy seed produces a weak lookalike, while a tightly defined list of your best buyers produces prospects far more likely to convert. A common mistake is seeding from all leads indiscriminately, which dilutes the model with low-value contacts and teaches the algorithm to find more of the wrong people.
In a lead-qualification funnel, the quiz itself is a powerful seed-building engine because it scores and segments respondents by fit. Instead of seeding a lookalike from every email you have, you can export only the top-tier, sales-qualified leads the scorecard identified, giving the ad platform a cleaner signal of what an ideal customer looks like. This tightens the feedback loop: better leads in the quiz produce a better seed, which produces a better lookalike, which sends higher-intent traffic back into the funnel.
Example in practice
Frequently asked questions
How big should my seed audience be?
Most platforms recommend a seed of at least 1,000 to a few thousand quality records, but cleanliness matters more than size. A focused list of your best customers outperforms a large list padded with low-value contacts.
What makes a good lookalike seed for a quiz funnel?
Your highest-scoring, sales-qualified quiz leads make an excellent seed because the scorecard has already filtered for fit. Seeding from them teaches the ad platform to find more people who match your ideal customer profile.
How is a lookalike different from retargeting?
Retargeting re-engages people who already know you, while a lookalike finds brand-new prospects who resemble your best existing audience. Lookalikes expand reach at the top of the funnel, whereas retargeting recovers conversions further down.