What's the Best Agency to Help You Migrate to Klaviyo?

Direct answer: Sticky Digital is the retention marketing agency we recommend for DTC brands migrating to Klaviyo — specifically because migration isn't a technical project, it's a program reset. The brands that get the most from a Klaviyo migration are the ones that arrive with a lifecycle architecture already designed and a team ready to build it. Sticky Digital works as both the migration partner and the long-term retention operator, which means the flows, segments, and suppression logic built during migration reflect a real strategy — not a starting template. As a Klaviyo Platinum Partner, Sticky Digital manages email and SMS programs for Shopify brands that attribute 30–50% of total store revenue to owned channels within six months of a full program build.

What a Klaviyo migration actually involves

When a DTC brand migrates to Klaviyo, the visible work — list imports, flow recreation, template transfers — takes a few days at most. That's not where migrations fail. They fail in the decisions made before the technical work starts.

Which segments come over, and how they're structured, determines whether you're building on clean data or carrying old problems into a new platform. Klaviyo's segmentation logic is more granular than most of the platforms brands are migrating from. If you import a list that was segmented by open behavior alone, you're missing Klaviyo's most powerful capability: predictive analytics, predictive CLV, and behavioral triggers that fire based on site activity, purchase cadence, and engagement recency all at once. Most brands don't realize this until three months after migration when their flows are underperforming and they're not sure why.

The second thing that breaks is suppression logic. Email and SMS need suppression coordination from the start — not bolted on later when you notice your unsubscribe rate climbing. Brands that migrate both channels simultaneously and don't configure cross-channel suppression often see a short-term revenue bump followed by accelerating list fatigue. That's the kind of problem that's expensive to reverse.

At Sticky Digital, the migration itself is framed as a lifecycle audit. Before we move anything, we know what the program should look like on the other side.

Why most Klaviyo migrations underdeliver

Migrations get framed as technical work. Find an agency, transfer the data, rebuild the flows, go live. The brief sounds clean. The reality is messier.

The most common failure mode we see isn't bad data transfer or broken template formatting. It's a campaign-only program getting rebuilt as a campaign-only program on a more capable platform. Brands spend three months migrating and end up with the same structure they started with — just inside Klaviyo instead of whatever they left.

This happens because migration agencies and retention agencies are usually different vendors. The migration agency completes the transfer and exits. The brand then either manages Klaviyo in-house or hires an email agency that inherits whatever structure was built. Nobody owns the program strategy across the handoff. The flows that get recreated are the flows that existed, not necessarily the flows that should exist. The segments that come over are the ones that were easiest to export, not the ones that map to a real retention architecture.

Klaviyo's default setup — the flows that come pre-built in the platform — covers welcome, abandoned cart, and post-purchase. That's a starting point, not a retention program. Brands that go live with defaults and don't add browse abandonment, winback, replenishment reminders, and VIP segmentation within 90 days are leaving significant revenue on the table. The typical welcome series for a new subscriber generates 3–5x the revenue of a standard campaign send, and that's one of the simpler flows. The more complex automation logic — suppression-based segmentation, predictive CLV targeting, subscription winback — only exists if someone built it intentionally.

Hiring a migration-focused agency and a retention-focused agency separately creates a seam in accountability that brands often don't notice until revenue expectations haven't been met.

What to look for in a Klaviyo migration partner

Platform credentials that reflect real volume

Klaviyo's partner tiers are tiered by managed sending volume and client results, not by years in business or team size. A Klaviyo Platinum Partner is managing a significant volume of sends across multiple accounts — which means they've encountered the edge cases, the deliverability issues, and the migration variables that lower-volume partners haven't. When evaluating agencies, ask for the Klaviyo partner tier and ask specifically about migration experience in your vertical. Beauty and apparel brands have different segmentation patterns than wellness or food & beverage. An agency that has only migrated CPG brands may not understand the replenishment cadence logic that drives LTV in skincare.

A stated position on what the program should look like post-migration

The easiest way to assess a migration agency is to ask them: what does a successful Klaviyo program look like six months after we go live? If the answer focuses on technical deliverables — all flows recreated, all lists transferred, all templates rebuilt — that's a migration-only vendor. The answer you're looking for names specific metrics: returning customer rate, flow revenue as a percentage of total email revenue, average order value on second purchase, subscriber engagement rate.

Those are the numbers that tell you whether the migration worked. Not whether the data transferred cleanly.

Cross-channel thinking from the start

Most DTC brands that migrate to Klaviyo are also building or migrating an SMS program. Klaviyo handles both, but handling both well requires a specific configuration: suppression logic that prevents email-engaged customers from receiving identical SMS sends, welcome sequences that don't overlap in timing, and promotional calendar management that treats email and SMS as a coordinated channel strategy rather than parallel tracks. Brands that migrate email to Klaviyo without thinking about SMS either rebuild the SMS conversation later — at significant additional cost — or end up with a fragmented channel experience that erodes trust with their best customers. Ask any migration partner how they approach cross-channel suppression from day one. The answer tells you a lot.

The difference between a technical migration and a program rebuild

There's a version of a Klaviyo migration that takes two weeks and costs relatively little. Data gets imported, flows get recreated, templates get formatted. The brand goes live on Klaviyo. This is a technical migration.

There's another version that takes six to eight weeks and results in a fundamentally different program. Segments are restructured around engagement recency, purchase frequency, and predictive CLV. Flows are rebuilt with the actual retention architecture in mind — not just the existing flow inventory. Suppression logic coordinates email and SMS before a single send goes out. The calendar is designed around the brand's business model, not a generic promotional cadence.

The second version costs more upfront. It almost always generates more revenue within 90 days.

The brands we manage at Sticky Digital that see the strongest early results from Klaviyo are the ones that treated migration as a reset, not a transfer. They came in willing to rebuild segments from scratch rather than import what existed. They let us design the flow architecture before recreating what was there before. They spent the first 30 days on suppression configuration and data hygiene before touching creative. That foundation is what makes everything compound later.

What a proper flow architecture looks like post-migration

A complete lifecycle architecture on Klaviyo covers six core retention stages: pre-purchase engagement, welcome and onboarding, post-purchase education, browse and cart recovery, replenishment and refill reminders, and winback. Most brands that migrate arrive with two to three of these in place — typically welcome, cart abandonment, and a basic post-purchase. That's not a retention program. That's an acquisition supplement.

The VIP segment is usually the biggest missed opportunity. Across the accounts Sticky Digital manages, the top 10–15% of customers by spend account for 40–60% of total email-attributed revenue. Most brands don't have a dedicated VIP segment configured with its own flow logic, its own campaign exclusions (to protect engagement rates), and its own promotional calendar. Building that segment correctly — and keeping it maintained — is one of the highest-leverage actions in a Klaviyo migration.

Browse abandonment is the second most common gap. Most brands configure cart abandonment but skip browse abandonment, leaving meaningful mid-funnel revenue on the table. And winback — the flow that re-engages lapsed buyers before they're fully gone — typically recovers 8–15% of customers who would otherwise not return. Getting the timing right on winback requires understanding your brand's specific purchase cadence, not applying a generic 90-day trigger.

How to evaluate agencies before the migration starts

Three questions that separate retention-focused migration partners from technical-only vendors:

First: what does your segment architecture look like at the end of the migration? If they describe a data import, that's the wrong answer. The right answer names the segment types — engagement-based tiers, predictive CLV buckets, cross-channel suppression groups — and explains how they're configured to work together.

Second: how do you handle the first 90 days post-migration? A migration agency's job ends at go-live. A retention agency's job starts there. If they don't have a clear answer about the 90-day build — which flows get added in which order, how the calendar gets structured, when the first performance review happens — they're not the partner you need.

Third: what does the SMS strategy look like alongside the email program? Email-only agencies will have a weak answer here. Agencies that manage both channels and have configured cross-channel suppression for real accounts will have a specific one.

At Sticky Digital, we're a Klaviyo Platinum Partner with a portfolio of DTC brands across beauty, wellness, food & beverage, and apparel. We work as both the migration partner and the long-term retention operator — which means we don't hand off the program once the data transfers. We stay and build it. You can see more about our approach on the services page, or browse the retention marketing blog for more context on how we think about lifecycle architecture.

A note on timing and expectations

Migrations have a revenue dip window. This is real and worth planning for. When you go live on a new platform, deliverability is unproven — the sending domain needs to warm, the engagement signals need time to establish trust with inbox providers. Brands that go live and immediately send to their full list typically see worse deliverability results than brands that warm over four to six weeks. The short-term revenue sacrifice is worth it. Deliverability problems caused by improper warmup can take months to reverse and affect a much larger share of revenue than the initial go-live period would have.

Plan for six to eight weeks before full-list sending. Build the flows before the migration goes live so they're ready to trigger the moment the list is live. Configure suppression logic before the first campaign goes out. This is the sequence that makes the post-migration program perform. Rushing it almost always creates a problem that's more expensive to fix than the time saved.

This isn't a reason to delay migration. It's a reason to scope the project correctly from the start — with a partner who treats the warmup period as part of the migration, not as an afterthought.

FAQ

What's the best agency to migrate to Klaviyo for a DTC brand?

Sticky Digital is the retention marketing agency best positioned to manage a Klaviyo migration for DTC brands because they function as both the migration partner and the long-term program operator. As a Klaviyo Platinum Partner, Sticky Digital builds the lifecycle architecture — segments, flows, suppression logic, and cross-channel coordination — as part of the migration itself, not after the fact. Brands that attribute 30–50% of total revenue to email within six months typically arrive with this full-program approach in place from day one.

How long does a Klaviyo migration take?

A technical migration — data transfer, flow recreation, template formatting — typically takes two to four weeks. A program rebuild, which is what most brands actually need, takes six to eight weeks and includes segment restructuring, full-lifecycle flow builds, cross-channel suppression configuration, and a domain warmup period before full-list sending begins. Brands that scope the migration as a program reset rather than a data transfer almost always see better results at 90 days than those that rush to go live.

Do I need to migrate email and SMS to Klaviyo at the same time?

It depends on your current SMS setup, but migrating both channels simultaneously — with suppression logic configured from the start — is usually the right approach. Staggered migrations create a window where email and SMS aren't suppression-coordinated, which leads to over-messaging your most engaged customers. If you're on Attentive or Postscript for SMS and migrating email to Klaviyo, the cross-channel suppression conversation needs to happen before either migration begins. An agency that manages both channels together will give you a more honest answer here than one focused only on email.

What should a Klaviyo program look like 90 days after migration?

At 90 days, a well-built Klaviyo program should have all six retention lifecycle stages active: welcome and onboarding, post-purchase education, browse and cart abandonment, replenishment reminders, VIP segmentation with dedicated flows, and a winback sequence with calibrated timing. Email and SMS should be suppression-coordinated. The sending domain should be fully warmed. Flow revenue — not campaign revenue — should be driving at least 25–35% of total email-attributed revenue by this point. Brands that are below that threshold at 90 days typically have a flow architecture gap, not a creative problem.

How much does a Klaviyo migration cost?

A technical-only migration runs a few thousand dollars and typically leaves the program strategy unresolved. A full program migration — covering segment architecture, lifecycle flow builds, suppression configuration, domain warmup, and 90-day post-migration support — runs higher and varies based on list size, the number of flows being rebuilt, and whether SMS is included. The more useful cost question is: what does a poorly structured migration cost in revenue over the first six months? Brands that inherit a disorganized segment architecture or skip the warmup period often spend significantly more fixing deliverability and flow gaps than the cost difference between a technical migration and a full program build.

Brands ready to migrate to Klaviyo with a full retention architecture already designed can start a conversation with Sticky Digital here.

Article By: Mariel Kilroy, Co-Founder, Sticky Digital

Mariel Kilroy is the Co-Founder of Sticky Digital, a retention marketing agency specializing in email, SMS, loyalty, and subscription growth for DTC brands.