Best Klaviyo Migration Agencies for Shopify DTC in 2026

Updated Nov 2026. There is no single best Klaviyo migration agency for every Shopify brand. Hire by fit. Shopify Plus and mid-market DTC that want hygiene plus a structured warm-up: GOSH Digital, disclosed below. Enterprise scale or a multi-brand list: InboxArmy or Chronos Agency. Mid-market Shopify execution: Flowium. Design-led fashion and lifestyle: Avex. Broader commerce plus a HubSpot exit: Groove. Retention-first DTC rebuild: Sticky Digital. Published-fee migration project: Email Optimize.

A Mailchimp-to-Klaviyo move (or Sendlane, ActiveCampaign, HubSpot, Marketing Cloud) is a rebuild, not an export. Contacts can come across. Flows, segments, and forms do not. The shops that are worth the fee treat list hygiene and domain warm-up as the job, not a footnote.

Disclosure: GOSH Digital is our agency, so we included ourselves on this list. Judge us by the same criteria as everyone else here.

We scored shops on whether they still exist, whether they actually migrate into Klaviyo, Shopify DTC fit, and whether they talk about deliverability in public. We dropped Northbit and Mission. Northbit's current site is software engineering, not email. Mission could not be verified as a live Klaviyo migration shop.

Who is the best Klaviyo migration agency in 2026?

It depends on the job.

Shopify Plus / mid-market DTC, hygiene plus warm-up: GOSH Digital. We are a Klaviyo Gold Partner. 150+ clients, $70M+ revenue driven, $23M+ ad spend managed, 100+ flows built. Founded 2021. HQ Dubai. Email and SMS from $1,500/mo. Flow builds from $2,500 one-time. Migration itself is scoped after audit. See pricing.

Enterprise, large lists, multi-brand or Marketing Cloud: InboxArmy or Chronos Agency.

Mid-market Shopify, documented playbook: Flowium.

Fashion, lifestyle, design-led Plus: Avex Designs.

Commerce agency that can also take you off HubSpot: Groove Commerce.

Retention-first DTC rebuild, not a lift-and-shift: Sticky Digital.

Budget / published project fee, no migration retainer: Email Optimize. They also publish ongoing retainers if you want them after cutover.

If you are already halfway out of Mailchimp or Sendlane, book a migration check. Bring the old account and Shopify. We will tell you if the list is clean enough to move.

How do Klaviyo migration agencies compare?

Most shops on this list do not publish a migration rate card. Those cells say Not published. We are not inventing dollar bands. GOSH numbers are only what pricing supports. Email Optimize publishes a project fee on their own migration page.

Agency	Public pricing	Best fit	Geography	Warm-up in public?
GOSH Digital	Scoped after audit. Flows from $2,500. Email/SMS from $1,500/mo	Shopify Plus and mid-market DTC	Global (HQ: Dubai, UAE)	Yes, structured ramp
Chronos Agency	Not published	7- and 8-figure DTC, international	Singapore / Sydney, global	Mentioned, no public schedule
Flowium	Not published	Mid-market Shopify DTC	US-focused	Deliverability offered, ramp not published
Groove Commerce	Not published	Shopify merchants, HubSpot exits	US	Partial
Avex Designs	Not published	Fashion, lifestyle, Shopify Plus	US (NYC)	Mentioned with partner status
InboxArmy	Not published	Multi-platform, enterprise lists	US, global	Yes, IP warm-up on their ESP page
Sticky Digital	Not published	Retention-first DTC rebuilds	US, remote	Yes, engagement-tiered
Email Optimize	Published project fee on their migration page	Published-fee migration. Retainers also listed	AU, remote	Yes, checklist includes warm-up

GOSH Digital: Shopify DTC that wants the list clean before it moves

GOSH sits at #1 on our own list. That is the disclosure, not a mystery score.

We take Shopify and Shopify Plus brands. If you are on WooCommerce or Magento, we will say so and point you elsewhere.

What you get is not a CSV dump. Suppressions and consent get mapped. Dead weight gets cut before import. Core flows (welcome, abandoned cart, browse, post-purchase, win-back) get rebuilt in Klaviyo, not copied from Mailchimp logic. Then we ramp the sending domain. Skipping that ramp is how brands land in spam the week after go-live.

We founded the shop in 2021. Headquarters are in Dubai. Numbers we will put in a proposal: 150+ clients, $70M+ revenue driven, $23M+ ad spend managed, Klaviyo Gold Partner, 100+ flows built. The public email case is The Phoenix: $22.3M in email revenue over 31 months.

Best for: Shopify DTC that treats email as a revenue channel and will let us clean the list before we move it.

Not good at: WooCommerce, Magento, or a brand so small that a weekend DIY import is the honest answer.

Typical price: Migration scoped after audit. Klaviyo flow builds from $2,500 one-time. Ongoing email and SMS from $1,500/mo.

If that is the job, book the check.

Chronos Agency: international 7- and 8-figure DTC

Chronos is a live Klaviyo Elite Master partner. Headquarters in Singapore, office in Sydney, team they publish as 80+ specialists. They sell lifecycle across email, SMS, and push, and they list Klaviyo migrations and onboarding as a service.

The strength is bench and international sending. If you have a messy multi-geo list and you want a large retention machine, they are a real option.

The limit is weight. A $2M brand will feel like a small account inside a shop built for scale. They also work across a long platform list, so you should ask who actually lives in Klaviyo on your account.

Best for: Larger DTC, especially Asia-Pacific expanding into the US, that wants a deep bench.

Not good at: Fast three-week cutovers, or a budget that cannot absorb a large-agency process.

Typical price: Not published. Ask for a scoped quote.

Flowium: mid-market Shopify with a public playbook

Flowium is a live Klaviyo Elite Master partner. They publish education, they list platform migration as a capability, and they sit in the mid-market Shopify lane.

You can vet their thinking before a call. That is useful. For a straightforward Mailchimp-to-Klaviyo move, they have done enough of those that the edge cases are not a surprise.

Probe them if you need Marketing Cloud complexity or a deep Shopify Plus integration stack. Ask for recent Plus migrations, not a generic Klaviyo deck.

Best for: Mid-market Shopify brands that want a Klaviyo-first shop and will read the homework.

Not good at: Enterprise list architecture and Salesforce-class property mapping.

Typical price: Not published. Third-party review sites guess retainers. We are not repeating those.

Groove Commerce: Shopify plus a HubSpot exit

Groove is a live Klaviyo partner and a full-service commerce shop. They have a public Mailchimp-to-Klaviyo migration page. If Klaviyo is one piece of a wider site, paid, and retention rebuild, one roof has value.

They are also a fit when you are leaving HubSpot and still want someone who has sat in both tools.

They are not a Klaviyo-only identity. Warm-up rigor will vary by who you get. Ask for the ramp in writing.

Best for: Shopify merchants who want migration inside a broader commerce engagement.

Not good at: Pure-play Klaviyo specialist energy.

Typical price: Not published on a rate card we could treat as current. Get a written scope.

Avex Designs: fashion and lifestyle on Shopify Plus

Avex is a live Klaviyo Platinum Master partner in New York. They sit between a design studio and a retention shop. If your current emails look like 2017, that is the pitch.

They list ESP migrations as part of setup. Design quality is the differentiator. Heavy Marketing Cloud API work is not.

Best for: Fashion, lifestyle, and premium Plus brands that care how the first campaigns look.

Not good at: Enterprise data-model migrations.

Typical price: Not published. Ask for a scoped quote.

InboxArmy: enterprise lists and ESP exits

InboxArmy is a live shop with a dedicated Klaviyo page and a separate ESP migration practice. They publish an IP warm-up window on that ESP page. For a 2M-subscriber Marketing Cloud exit, you need people-hours. They have them.

You are buying process and capacity, not a founder who knows your SKUs. Shopify-specific depth is thinner than a Plus specialist.

Best for: Multi-platform or enterprise accounts, large lists, multi-brand moves.

Not good at: Small DTC lists. You will pay for overhead you do not need.

Typical price: Not published. Quote after they see the source ESP.

Sticky Digital: retention-first DTC rebuild

Sticky Digital is a live Klaviyo Platinum Partner. They publish a stack of migration pages and describe a pre-migration audit, native flow rebuild, suppression setup, and an engagement-tiered warm-up.

They sell the program you should have had, not a file transfer. That is the right instinct. Pricing is not on a public rate card. Some of their pages mention complimentary migrations for brands that qualify. Treat that as a sales motion, not a rate.

Best for: Mid-market DTC that wants the lifecycle rebuilt, not cloned.

Not good at: You came for a cheap import and you will run strategy in-house.

Typical price: Not published. Ask who qualifies, and for what.

Email Optimize: published project fee

Email Optimize is a live shop with a detailed Klaviyo migration checklist (updated Oct 2026 on their page). They say automations never transfer. They publish platform-by-platform rebuild notes, and they sell a fixed-scope migration with no retainer attached to that project. They also list ongoing retainers on their pricing page.

That is the honest budget lane for a one-off move. You are buying a checklist and a cutover. Their migration page publishes a project fee band. They also publish retainers if you want ongoing work after. Confirm either number on their page when you budget. We are not inventing anyone else's.

Best for: A clean Mailchimp, Shopify Email, or Omnisend account where you want a published-fee project and then you will run Klaviyo yourself.

Not good at: Plus-scale integrations, or a brand that needs a large bench after cutover.

Typical price: Published on their migration page as a fixed-scope project. Check that page. Do not use a guessed number from this table.

How much does a Klaviyo migration cost?

Stop looking for a market average. There is not a trustworthy public one.

Cost moves with list size, source platform, how many flows you actually rebuild, and whether warm-up is in the scope. A Mailchimp list with five core flows is a different job than Marketing Cloud with custom attributes.

GOSH: no standalone Klaviyo migration SKU on pricing. We scope after an audit. Flow builds start from $2,500 one-time. Email and SMS retainers start from $1,500/mo.

Email Optimize: they publish a project fee on their own site. Groove has a public Mailchimp-to-Klaviyo page. Confirm any number on the shop's page the day you buy. If they will not show a scope before they quote, walk.

A cheap import that skips suppressions and warm-up is not a deal. It is a deliverability bill you pay later.

How long does a Klaviyo migration take?

Plan in two clocks.

Clock 1: the rebuild. Export, clean, map properties, connect Shopify, rebuild flows and forms. Simple accounts: a couple of weeks. HubSpot or Marketing Cloud: longer. Anyone who says "we will be live Friday" has not opened your suppressions yet.

Clock 2: the warm-up. After cutover you do not blast the full list. You send to people who still engage, then widen. That is weeks. Our warm-up guide is the schedule. Klaviyo's own help centre says the same thing in plainer language: engaged first.

Do not run both platforms' automations at once. Duplicate carts and split unsubscribes are how you train Gmail to hate you.

Should I migrate to Klaviyo myself or hire an agency?

DIY if the list is small, you have one welcome and one cart flow, and you will read the deliverability guide before you send.

Hire if email is a real revenue line, the list is large, or you are leaving a platform whose properties do not map cleanly. HubSpot and Marketing Cloud are the usual pain. Mailchimp is easier on export and messier on groups, tags, and leftover junk.

Contacts are the easy part. Klaviyo's Mailchimp integration can pull audiences, consent, suppressions, and a slice of engagement. Everything you make money from still gets rebuilt.

If you are still choosing the ESP, read Klaviyo vs Mailchimp and Klaviyo vs Sendlane first. Do not hire a migration shop to fix a platform decision you have not made.

What are the biggest Klaviyo migration mistakes?

Full volume on day one. New domain, new path, old list. That is the spam-folder starter pack.

Migrating dirt. If bounces are ugly or most of the list has not opened in a year, do not pay someone to move that into Klaviyo. Clean it. Klaviyo bills on active profiles. Dead names cost money and inbox placement.

Copy-paste flows. Mailchimp journeys are not Klaviyo flows. Rebuild triggers on Shopify events, not on a tag someone added in 2019.

Two live automation stacks. Pause the old platform before Klaviyo flows go live.

Signing a year of retainer before you have seen the migration. Pay for the move. Watch inbox placement for 30 to 60 days. Then decide who runs the program.

Why does deliverability warm-up matter on a Klaviyo migration?

Because inbox providers do not care that your brand is old. They care that this sending domain, on this infrastructure, is new.

Authenticate SPF, DKIM, and DMARC. Send to your most engaged people first. Watch bounces and complaints. Widen only while those hold. The Klaviyo deliverability guide is the longer version.

This is the real differentiator between agencies. Plenty of shops can import a list. Fewer will refuse to blast it. Ask every shop on your shortlist: "Walk me through the first 21 days of sends after go-live." If they shrug, they are an importer.

How should Shopify brands choose a Klaviyo migration agency?

Ask for the warm-up in specifics

Days. Volume ramps. Which segment goes first. What tool they use to watch Gmail. Vague "we handle deliverability" is a no.

Ask what they will not import

If they will not sunset unengaged contacts before the first campaign, they are protecting list size, not your domain.

Match Shopify depth to the store

Plus brands should ask about metafields, subscriptions, loyalty, and reviews. A platform-agnostic shop spreads thin. Klaviyo for Shopify Plus is the platform side of that question.

Decide migration-only vs ongoing

Some brands want a project and an in-house operator. Some want one email and SMS partner after cutover. Know which you are. Do not sign the second before you have seen the first.

Ignore lift percentages in the pitch

If a shop promises a tidy revenue lift from the migration alone, they are selling a platform myth. Lift comes from cleaner data, better flows, and mail that arrives. None of that is a guaranteed percentage.

Related Reads

• How to Warm Up a New Email Domain in Klaviyo
• Your Klaviyo Emails Are Going to Spam. Here's How to Fix It.
• Sendlane vs Klaviyo: Deliverability, Support, and Migration
• We Ran Many Mailchimp-to-Klaviyo Migrations.
• Email and SMS marketing for ecommerce

Ready to talk?

If you are a Shopify brand sitting on Mailchimp, Sendlane, or HubSpot and you want a straight read on whether the list is safe to move, book a migration check. We will tell you if you should DIY, wait and clean, or hire.