Klaviyo's AI-powered segment builder is one of the most genuinely useful updates the platform has rolled out in a while. Instead of manually configuring every condition, you can now describe the audience you're looking for in plain English, and Klaviyo's AI will translate that into a working segment - ready to review, refine, and use.
If you've ever spent an afternoon wrestling with segment conditions in Klaviyo - stacking filter after filter, second-guessing your logic, only to end up with an audience that feels a bit off - you're going to love what they've been building. This post walks you through exactly how it works, where it shines, and how to get the most out of it.
Klaviyo introduced natural language segmentation as part of their broader push to bring AI-driven tools into everyday marketing workflows. Rather than building segments by manually selecting properties and operators, you type a plain-language description of your target audience and Klaviyo generates the segment conditions for you.
It's worth being clear: the AI isn't making marketing decisions for you. It's translating your intent into Klaviyo's segment logic. You still review, approve, and refine the output. Think of it as a very capable assistant that handles the technical heavy lifting - while you stay in control of the strategy.
The difference between a segment built with real precision and a rough approximation can be the difference between a 35% open rate and a 15% one - and between nurturing a loyal customer and landing in the promotions tab.
The problem has always been the gap between what marketers know and what they can build. Most people can articulate their ideal audience in a sentence. Far fewer can translate that into a nested set of Klaviyo conditions without it taking thirty minutes and three attempts. The AI segment builder closes that gap - making sophisticated segmentation accessible for anyone managing a Klaviyo account, not just specialists.
Here's the exact process from start to a live, dynamic segment - including where your expertise still matters most.
Head to Lists & Segments in your Klaviyo account and click Create Segment. You'll land in the familiar segment editor - but now you'll notice a new option at the top: "Describe your segment" or a similar AI prompt field, depending on which version of the interface you're on.
This is where it gets genuinely interesting. Type a description of the audience you want to reach. Be as specific as you can - the more detail you give, the more accurate the output. You can reference purchase history, engagement behaviour, spend thresholds, time windows, and even predictive properties like churn risk or predicted LTV.
Klaviyo will generate a set of segment conditions based on your description. Don't just hit save - take a moment to review them. Check that the logic matches your intent, that the operators (at least, exactly, is not) are correct, and that the time windows make sense for your send frequency. This is where your expertise still matters most. The AI handles the translation - you handle the strategy.
Use the Preview option to see how many profiles your segment currently includes. If the number looks too high or too low, adjust the conditions manually or try rephrasing your description. A well-built segment typically has a clear, defensible rationale - if you can't explain in one sentence why someone belongs in that audience, it's worth tightening the logic.
Give your segment a name that makes sense to anyone on your team - not just you right now, but future-you and your colleagues. Something like "New Customers - No Second Purchase (60 Days)" beats "Segment April 2026" every single time. Once saved, your segment is live and dynamic - it will update automatically as your customer data changes.
The quality of your prompt directly affects the quality of your segment. Here are examples that consistently produce accurate, useful results.
Not sure which segments to prioritise? These five audiences consistently deliver the highest ROI across Klaviyo accounts - and all five translate well into AI prompt descriptions.
| Segment | Why It Matters | Best Used For |
|---|---|---|
| Win-back candidates | Lapsed customers with 2+ previous purchases - your most recoverable churned buyers | Targeted re-engagement campaigns with a time-limited incentive |
| Post-first-purchase non-repeaters | New customers who haven't returned within 45-60 days - highest churn risk window | Second purchase nudge flows with product recommendations |
| Engaged non-buyers | Consistent openers and clickers who've never converted - qualified but unconvinced | Social proof-heavy campaigns, offer-led conversion push |
| High-value actives | Top spenders still engaging - your most valuable relationships to protect | VIP treatment, early access, loyalty programmes |
| Unengaged subscribers | 90+ days of no engagement - candidates for sunset or re-engagement before they hurt deliverability | Last-chance re-engagement campaign, then suppression |
We work with brands to get serious about their Klaviyo setup - from segmentation strategy to flow architecture and deliverability. Get in touch and we'll take a look.
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