What is the difference between a segment and a list in Klaviyo?

A list is a static group of subscribers captured at a single point, such as everyone who signed up through a particular form. It does not change on its own. A segment is dynamic. It is defined by conditions and updates automatically as profiles meet or stop meeting those conditions. Most behaviour-led and value-led targeting should use segments, because they always reflect a customer’s current state rather than a moment in the past.

What is customer lifetime value in Klaviyo and how is it calculated?

Klaviyo reports two CLV figures. Historic CLV is the total a customer has already spent. Predicted CLV is a machine learning estimate of what they are likely to spend over the coming year. Predicted CLV only becomes available once an account has enough data, generally at least 180 days of order history, orders in the last 30 days and 500 or more customers who have placed an order. It is an estimate rather than a guarantee, so it should guide strategy, not dictate it on its own.

Should I use Klaviyo AI segments?

Klaviyo’s Segments AI is a helpful tool for turning a plain-language description into segment conditions quickly. It is excellent for speed and for testing ideas. What it cannot do is make strategic decisions. It does not understand your margins, stock, deliverability position or commercial goals, and predictive metrics it draws on estimate behaviour without telling you whether your marketing will change that behaviour. We use AI to move faster, then apply human judgement to decide who to target and why.

What is a never engaged segment and why does it matter?

A never engaged segment groups subscribers who have never opened or clicked an email since they joined. Continuing to send to them lowers your engagement rates and signals to mailbox providers that your email is unwanted. Managing these contacts properly through a re-engagement attempt and then suppression protects your sender reputation and improves inbox placement for the customers who do want to hear from you.

How do you segment new versus returning customers in Klaviyo?

We segment primarily on the number of placed orders and on purchase recency. New customers can be guided towards a strong second purchase, while returning and repeat customers can be moved into loyalty, replenishment and VIP journeys. Separating these groups is one of the simplest and most effective improvements most brands can make, because it stops first-time buyers and loyal customers receiving identical, generic messaging.

How many segments should a brand have?

There is no single correct number and more is not better. We usually recommend starting with a tight core of high-impact segments then expanding as the data and the team’s capacity allow. Too many overlapping segments create confusion, inconsistent targeting and maintenance overhead. Clarity and active maintenance matter far more than volume.

Does segmentation really affect deliverability?

Yes, significantly. Sending to your entire list, including disengaged contacts, is one of the fastest ways to damage deliverability. Mailbox providers use engagement as a key signal for where to place your email. Good segmentation keeps your sends focused on people who engage, which protects inbox placement across your whole programme. It is as much a deliverability tool as a targeting one.

Klaviyo Segmentation Services

Klaviyo email segmentation experts

We see it all the time, businesses sending the same message to your whole list - which is probably one of the fastest ways to waste revenue and damage your deliverability. We'll help you build precise, behaviour-led Klaviyo segments that put the right message in front of the right customer. We'll then connect those segments to flows and campaigns that convert.

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Klaviyo segments that actually drive revenue

Good segmentation is the difference between an email strategy that grows revenue and one that slowly erodes your sender reputation. We’re an official Klaviyo partner but most importantly, we’re trusted by brands to deliver revenue growth in a sustainable way. This helps shape our approach around segmentation, we use it as a foundation – everything else is built on, Klaviyo segmentation to us isn’t an afterthought.

Every client we work with has varying levels of data, some are in good shape, most aren’t – the experts we hire are all seasoned veterans in the industry and there isn’t a lot they haven’t seen. For a second opinion, don’t forget to claim your free Klaviyo audit.

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What Klaviyo segments really do

A Klaviyo segment is a dynamic group of profiles that updates in real time as people meet or fall out of a set of conditions. Unlike a static list, which is a fixed snapshot of subscribers at one moment, a segment is always live. Someone who abandons a basket, crosses a spend threshold or stops engaging moves in or out automatically.

That live behaviour is exactly why segmentation is so powerful and exactly why it goes wrong so often. Conditions that are too loose pull in disengaged contacts, while conditions that are too tight starve your flows of volume. We also help work with tricky CRMs; some are super easy to connect to for us to generate meaningful data, others require a lot of integration and support – we can help you regardless of the system status.

Advanced segmentation and flows working together

Segments are only worth building if they change what a customer receives. Advanced Klaviyo segmentation and flows are two halves of the same system. We use segments to trigger, filter and branch automations so a first-time buyer, a loyal repeat customer and an at-risk subscriber never get the same generic message.

That might mean splitting a welcome series by acquisition source, suppressing recent purchasers from a sale campaign or routing high-value customers into a VIP path. Our Klaviyo flow management and segmentation work are designed to run as one connected strategy. It’s all about meaningful work that delivers improvements, nothing is done for the sake of it and all data-backed with constant testing caked into our strategy.

Segmenting by customer lifetime value

Klaviyo customer lifetime value comes in two forms. Historic CLV is the total a customer has already spent with you. Predicted CLV is Klaviyo’s machine learning estimate of what they are likely to spend over the next year. Used well, CLV lets you spend more attention on the customers who deserve it and protect margin everywhere else.

Predicted CLV needs enough data to be reliable. Klaviyo requires at least 180 days of order history, orders within the last 30 days and at least 500 customers who have placed an order before it can model predictions. We help brands reach and interpret that data correctly, rather than building strategy on numbers that are not yet trustworthy.

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The never engaged segment in Klaviyo

A never engaged segment groups subscribers who have never opened or clicked since joining your list. They feel harmless but they quietly drag down your open rates, distort your reporting and push more of your email towards the spam folder. Mailbox providers read low engagement as a signal that people do not want to hear from you.

We build never engaged and sunset segments that protect your sender reputation, give disengaged contacts a final genuine chance to re-engage then confidently suppress the ones who do not. Cleaner data means better inbox placement for the customers who do want to hear from you. This sits alongside our Klaviyo deliverability services and also can possess a cost saving element to it – a bloated, non suppressed list can cause additional charges.

New versus returning purchases in Klaviyo

A first-time buyer and a loyal repeat customer are at completely different points in their relationship with you, so they should never receive the same message. Segmenting new versus returning purchases in Klaviyo lets you welcome and convert new customers while rewarding and retaining the ones who already trust you.

We segment on placed order counts and purchase recency to drive second-order flows, cross-sell and upsell journeys, replenishment timing and VIP recognition. It is one of the highest-impact, lowest-effort improvements most brands can make to their Klaviyo account.

Climb & Conquer Board Room with Chris Ellis

Segments we build for eCom brands

Behavioural: Engagement tiers

Recently engaged, lapsing and never engaged groups that protect deliverability and target campaigns at people who actually want them.

Value: Customer lifetime value

Historic and predicted CLV tiers so high-value customers get attention and budget while low-value contacts are handled efficiently.

Recency: RFM groupings

Recency, frequency and monetary scoring to surface champions, loyal customers and those quietly slipping towards churn.

Lifecycle: New versus returning

First-time buyers, repeat customers and VIPs separated so each receives messaging built for their stage, not a generic blast.

Retention: Win-back and at risk

Customers showing disengagement or overdue for a repeat order, grouped for targeted reactivation rather than blanket discounting.

Growth: Cross-sell and upsell

Buyers of specific products or categories ready for complementary recommendations, replenishment prompts and considered upsells.

Margin: Discount sensitivity

Identify who only ever buys on promotion so you can protect margin and stop training your best customers to wait for a sale.

Profile: Demographic and geographic

Location, preferences and declared interests used to localise messaging, time sends and reflect what each customer told you.

Custom Quiz and property based

Custom profile properties from forms, quizzes and your store data, turning first-party signals into genuinely personal targeting.

Segmentation that shows up in the numbers

Better targeting is not a vanity exercise. Tighter segments mean higher engagement, stronger deliverability and more revenue per send. A snapshot of recent Klaviyo and email results from our work.

View our Work

Stairparts Direct
Led by:
40 %
Increase in Email revenue in 90 days

Read case study
NuWave Drinks
Led by:
124 %
Turnover growth YoY

Read case study
Gingerlily
Led by:
163 %
Increase in Klaviyo US revenue YoY

Read case study

Most accounts we audit fall into one of two traps. Either there is barely any segmentation and everything goes to the whole list, or there are dozens of overlapping segments nobody fully understands and engagement is quietly suffering. Both cost revenue. The right answer is rarely more segments, it is the right segments, clearly defined and actively maintained.

We start with your data...

and your commercials

Before we build anything we look at how your customers actually behave. Purchase frequency, average order value, repeat rates, engagement decay and the products that drive lifetime value all shape the segment strategy. A subscription brand, a considered-purchase brand and a fast-repeat consumables brand need completely different structures.

We build a core

then expand

We typically start with a tight core of high-impact segments rather than overwhelming an account from day one. A strong foundation usually includes:

– Engagement tiers to protect deliverability

– New versus returning and VIP value tiers

– CLV and RFM groupings once the data supports them

– Win-back and at-risk segments for retention

– Cross-sell, upsell and replenishment segments tied to products

From there we expand with confidence, testing new segment ideas against real engagement and revenue rather than adding complexity for its own sake.

Segmentation protects deliverability,

not just targeting

This is the part too many brands miss. Every time you send to disengaged contacts you teach mailbox providers that your email is unwanted, which hurts inbox placement for everyone on your list. Disciplined segmentation is one of the strongest levers you have for staying out of the spam folder, which is why our segmentation and deliverability work always move together.

Segments feed everything else

Improving outcomes

Clean segments make your flows sharper, your campaigns more relevant and your reporting more honest. They also make your wider marketing better, which is why we connect Klaviyo audiences to paid channels through our Klaviyo and Google Ads integration work. Segmentation done well lifts the whole programme.

An Honest Take Why we are careful with Klaviyo AI segments

Klaviyo’s Segments AI lets you describe an audience in plain language and have a segment built for you in seconds. It is a genuinely useful tool and we use it. But it is important to understand what it is and what it is not.

Segments AI is a faster way to write segment conditions. It is not a strategist. It does not know your margins, your deliverability state, your stock position or your commercial goals. It builds what you ask for, which means a vague or flawed brief produces a confident but flawed segment.

The detail most brands miss: predictive metrics estimate what a customer is likely to do but they do not tell you whether your marketing will actually change that outcome. Predicted CLV is an estimate, not a fact and Klaviyo itself notes it can return impossible figures such as 1.43 predicted orders.

AI speeds up the build. It does not replace the judgement that decides who to target, how often and why. That judgement is what we bring.

Common Questions: Klaviyo segmentation FAQs

A list is a static group of subscribers captured at a single point, such as everyone who signed up through a particular form. It does not change on its own.

A segment is dynamic. It is defined by conditions and updates automatically as profiles meet or stop meeting those conditions. Most behaviour-led and value-led targeting should use segments, because they always reflect a customer’s current state rather than a moment in the past.
Klaviyo reports two CLV figures. Historic CLV is the total a customer has already spent. Predicted CLV is a machine learning estimate of what they are likely to spend over the coming year.

Predicted CLV only becomes available once an account has enough data, generally at least 180 days of order history, orders in the last 30 days and 500 or more customers who have placed an order. It is an estimate rather than a guarantee, so it should guide strategy, not dictate it on its own.
Klaviyo’s Segments AI is a helpful tool for turning a plain-language description into segment conditions quickly. It is excellent for speed and for testing ideas.

What it cannot do is make strategic decisions. It does not understand your margins, stock, deliverability position or commercial goals, and predictive metrics it draws on estimate behaviour without telling you whether your marketing will change that behaviour. We use AI to move faster, then apply human judgement to decide who to target and why.
A never engaged segment groups subscribers who have never opened or clicked an email since they joined. Continuing to send to them lowers your engagement rates and signals to mailbox providers that your email is unwanted.

Managing these contacts properly through a re-engagement attempt and then suppression protects your sender reputation and improves inbox placement for the customers who do want to hear from you.
We segment primarily on the number of placed orders and on purchase recency. New customers can be guided towards a strong second purchase, while returning and repeat customers can be moved into loyalty, replenishment and VIP journeys.

Separating these groups is one of the simplest and most effective improvements most brands can make, because it stops first-time buyers and loyal customers receiving identical, generic messaging.
Yes, significantly. Sending to your entire list, including disengaged contacts, is one of the fastest ways to damage deliverability. Mailbox providers use engagement as a key signal for where to place your email.

Good segmentation keeps your sends focused on people who engage, which protects inbox placement across your whole programme. It is as much a deliverability tool as a targeting one.