Migrate to Klaviyo without broken flows, lost data, or deliverability damage.
Most brands copy their email list and hope it works. That costs them 30 to 90 days of lost revenue. We scope your migration before any data moves, validate every contact batch, and go live only when every review passes.
Most brands migrate to Klaviyo the wrong way. Here is what that costs.
Moving to Klaviyo is not a list export. Every mistake in your migration shows up as lost revenue, broken flows, or a spam rate that takes months to fix.
Copy the list. Hope it works.
- Your behavior data, custom properties, and suppression history vanish when segments export as flat CSV files
- Flows copied without a logic review send wrong triggers and broken split paths from day one
- Sending full volume to a new domain on launch day spikes spam complaints and hurts inbox rates for months
- No parallel run means revenue attribution disappears the moment you cut over — sometimes for 30 to 90 days
- No historical order data means Klaviyo's predictive models start from zero. You paid for the platform's best feature and switched it off
Every contact mapped. Every flow tested. You cut over only when it passes.
- We build a full data map before migration starts. Every property, segment rule, and suppression state is documented
- Your sending domain warms up on a structured 6-week ramp. Inbox rates stay healthy from the first send
- We back-load 24 months of order history. Klaviyo's predictive models and CLV scoring start from real data
- Your old platform keeps sending until every Klaviyo flow passes a full review. We confirm attribution is clean before cutover
- You receive a 24-point pre-launch checklist and a 30-day post-launch monitoring window
From kickoff call to live Klaviyo account in 10 days.
Five phases. One fixed price. Every step documented before we move a single contact.
We audit everything before anything moves
We review your current platform from top to bottom before writing a single line of migration logic. Every list, segment, flow, and integration receives a documented pass or fail.
- Full list and segment inventory with subscriber counts
- Flow and automation logic review
- Integration dependency map (store, reviews, loyalty)
- Data quality assessment: bounce rates, suppression gaps
Your customer data gets an exact match in Klaviyo
Every custom field in your old platform gets a direct Klaviyo equivalent. Segment logic is rewritten in Klaviyo's filter language. Not approximated. Not guessed.
- Property-to-property field mapping document
- Segment logic rewritten in Klaviyo filter syntax
- Historical order data import mapped and staged
- Suppression and unsubscribe mapping confirmed
Contacts move in batches. Each batch is checked before the next starts.
We import 10,000 contacts at a time and verify every field against the mapping document. If one batch has a problem, we catch it before it affects 80,000 subscribers.
- Batched import: 10k contacts per cycle with review check
- Historical order back-load: 24 months of purchase data
- Suppression list imported before any sends fire
- Parallel run maintained on old platform until cutover
Your flows are rebuilt with better logic, not just copied over
Every automation is rebuilt in Klaviyo using features your old platform could not run. Predictive triggers replace static time delays. SMS joins email where it makes sense.
- Welcome, abandoned cart, win-back, post-purchase rebuilt
- Predictive analytics triggers added where old flows used static time delays
- SMS flows set up alongside email where applicable
- A/B variants staged and ready for post-launch testing
We go live only when every item on the checklist passes
We hold launch until a 24-point review is complete. Then your sending domain warms up over six weeks so your emails land in the inbox from day one.
- Full pre-launch checklist: 24-point sign-off
- Sending domain warm-up plan: weeks 1 to 6 volume ramp
- Attribution tracking confirmed live before cutover
- 30-day post-launch monitoring included in scope
Every platform. Every migration size. One team that has done this 47 times.
We migrate from any email platform
Your contacts, flows, and segments transfer intact. It does not matter whether you are on Mailchimp, Omnisend, Drip, or a custom system. We have migrated them all.
Your emails land in the inbox from day one
We build a 6-week warm-up plan for your new sending domain. Volume starts low and ramps slowly. Inbox rates stay strong. Spam complaints stay low. Your list reputation is protected.
One price. No hourly billing. No scope creep.
You receive a line-by-line deliverable list before we start. The price is locked at sign-off. No change-order surprises. No invoices you did not expect.
See migration pricingEvery customer record arrives in Klaviyo in perfect condition
Every subscriber property, purchase event, and suppression state migrates with validation checks. We back-load 24 months of order history so Klaviyo's predictive models start from real data, not zero.
- Custom properties preserved
- 24 months order history back-loaded
- Suppression lists applied before first send
- 100% contact count reconciliation report
8 flows live on day one. 100% data preserved. Zero surprises.
Annie's Annuals and Perennials is an established California nursery with a seasonal catalog and a loyal regional customer base. They were running on a legacy PHP system that could not connect to Klaviyo.
Their old platform blocked every modern email tool. During peak spring season, emails fired at random. Historical purchase data was locked in a system with no API. They could not trigger automations based on what customers actually bought.
We migrated the full ecommerce platform to headless infrastructure and connected Klaviyo at the API level. We back-loaded 24 months of purchase history so their lifecycle flows launched with real customer data on day one.
Flat-fee migrations. You see the price before we start.
Every migration comes with a line-by-line deliverable list. You approve the scope before work begins. The price does not change at launch.
- Full list and segment migration
- Up to 5 flows rebuilt
- 12 months of order history imported
- Sending domain warm-up plan
- 14-day post-launch monitoring window
- Full list, segment, and property migration
- Up to 10 flows rebuilt with Klaviyo-native logic
- 24 months of order history imported
- 6-week sending domain warm-up plan
- 30-day post-launch monitoring window
- SMS flows set up alongside email
- Multi-account or multi-brand scope
- Custom app and loyalty program integrations
- Dedicated migration engineer assigned to your account
- 90-day post-launch monitoring and support
No commitment required to receive a proposal. Scoped before work starts. Line-by-line pricing. View full pricing details
Most migration consultants export a list and call it done. We migrate the whole system.
Your questions about the migration, answered directly.
Most migrations under 150k contacts finish in 10 days from kickoff to first live send. Enterprise accounts with multiple integrations or brands typically take 3 to 4 weeks. Before you agree to anything, you will receive a calendar showing dates for every phase.
No. We count your subscribers before the migration and after. If even one record is missing, we find the cause before you switch over. Suppression lists move first so no opted-out contacts receive a send by accident.
Your old platform keeps sending throughout the migration. Klaviyo flows are staged and tested in parallel but not yet live. Only when every flow passes a full review do we make the switch. We then keep the old platform running for 48 hours to confirm revenue attribution is clean before we shut it down.
Yes. Custom systems need a data export and a session where we review what fields and data you store. We will confirm whether we can do it and give you a flat-fee estimate. Most custom migrations work with the right data access.
Every migration includes a structured warm-up plan. If you follow the volume schedule and deliverability still drops, we diagnose and fix it as part of the 30-day post-launch monitoring at no extra cost. If deliverability drops because additional sends were made outside the warm-up schedule, that falls outside the migration scope — but we document this clearly before you sign so there are no surprises.
This migration service is the right fit for some businesses. Not for others.
- Email-first ecommerce brands with 5,000 to 500,000 subscribers on Mailchimp, Omnisend, Drip, ActiveCampaign, or a custom platform
- Shopify, BigCommerce, or headless stores with at least 6 months of order data to bring into Klaviyo
- Teams who want a fixed price, a clear scope, and zero surprises at launch
- Brands who want Klaviyo set up correctly from the start, not patched up six months later
- Brands who want to run the migration themselves and need guidance along the way. We scope and deliver the work, we do not coach.
- Teams with a hard deadline under 5 days. We will not skip the review phase to hit an arbitrary date.
- B2B companies where Klaviyo may not be the right tool. If that is your situation, we will tell you before you spend a dollar.
Not sure if this fits? Tell us your situation. We will give you a direct answer. Start the conversation
Get a flat-fee proposal in 3 days. No commitment. No surprises.
Tell us which platform you are on and how many contacts you have. We will review your situation, flag any risks, and send a line-by-line proposal within 3 business days.
- We respond to every brief within 48 hours
- Your proposal includes a phase-by-phase timeline
- Flat-fee, locked at sign-off. No change orders.
- You own the Klaviyo account. Always. We never hold it.
Related services
Tell us about your migration. We will take it from there.
You submit a brief. We call within 48 hours. You receive a scoped proposal in 3 days. Migration starts within 1 week of your sign-off.