Leave your old email service provider behind. Switch to Klaviyo the right way.
You know Klaviyo is the right move. The risk is the migration itself: broken flows, lost segments, deliverability damage. We scope every move in advance, map your data with precision, and go live without the surprises.
Most migrating brands get this badly wrong.
Moving to Klaviyo is not just a copy-paste of your email list. Every gap in your migration plan shows up as lost revenue on the other side.
Migrate by copying your list. Hope for the best.
- Segments exported as flat comma-separated files: all behavior data, custom properties, and suppression history lost in transit
- Flows rebuilt manually without logic review: trigger conditions wrong, split paths broken
- Deliverability destroyed: sending full volume on day one to a fresh sending domain spikes spam rates
- No parallel-run period: the moment you cut over, revenue attribution disappears for 30 to 90 days
- Historical purchase data not mapped: Klaviyo predictive models start from zero, defeating the platform's most powerful feature
Every list mapped. Every flow audited. Zero surprises at launch.
- Data map built before migration starts: every property, segment rule, and suppression state documented and matched
- Warm-up schedule built in: deliverability protected from day one with a structured ramp plan
- Historical order data back-loaded so predictive analytics and customer lifetime value models start from real purchase history
- Parallel send period kept live until Klaviyo passes a full review: you do not cut over until attribution is confirmed clean
From signed brief to live Klaviyo account in 10 days.
Five phases. One fixed scope. Every step documented before we move a single contact.
Platform audit and migration scope
We audit your current email service provider before writing a single line of migration logic. Every list, segment, flow, and integration gets documented with a pass/fail status.
- 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
Custom property and segment mapping
Every custom property in your old platform gets a Klaviyo equivalent. Segment logic gets translated into Klaviyo's filter language: not approximated.
- 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
Staged data migration with real-time validation
Contacts move in batches. Each batch is validated against the mapping document before the next starts. No bulk import and hope.
- 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
Flow rebuild and Klaviyo-native optimisation
Your existing automations are rebuilt in Klaviyo with improved logic: not just copied. We use Klaviyo-native features your old platform could not run.
- 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
Review, warm-up, and go-live with deliverability protection
We do not flip the switch until every review item passes. Then your sending domain warms up on a structured schedule so inbox rates stay healthy from week 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 migration path. One team.
Platform migrations
We migrate from any major email service provider. Your data, flows, and segments arrive intact regardless of the source.
Deliverability protection
A structured warm-up plan for your new sending domain. We start at low volume and ramp to full capacity over six weeks, so inbox rates stay healthy and spam complaints stay low.
Transparent pricing
Flat-fee migrations. Line-by-line scope before we start. No hourly billing, no change-order surprises.
See migration pricingFull data integrity
Every subscriber property, purchase event, and suppression state migrates with validation. Historical order data back-loaded 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
Zero data loss. Every flow live on day one.
An established California nursery with strong regional brand and complex seasonal catalog, migrating from a legacy PHP ecommerce system to a modern headless architecture with Klaviyo at the core of their marketing stack.
Legacy PHP platform blocked marketing velocity. Klaviyo integration was not possible on the old stack. Seasonal traffic spikes created unreliable send windows, and historical purchase data lived in a system that could not push events to any modern email service provider.
Full platform migration to headless ecommerce with Klaviyo lifecycle automation wired at the API level. Historical order data back-loaded. Flows built from scratch using real segment data, not imported templates.
Flat-fee migrations. No hidden hours.
Every migration is scoped upfront with a line-by-line deliverable list. You approve the scope before we start. Price locked at sign-off.
- Full list and segment migration
- Up to 5 flows rebuilt
- 12 months order history
- Domain warm-up plan
- 14-day post-launch monitoring
- Full list, segment, and property migration
- Up to 10 flows rebuilt with improved logic
- 24 months order history
- 6-week domain warm-up plan
- 30-day post-launch monitoring
- SMS flow setup included
- Multi-account or multi-brand scope
- Custom integration dependencies
- Dedicated migration engineer
- 90-day post-launch service agreement
Scoped before work starts • line-by-line pricing • no commitment required to receive a proposal. View full pricing details
Most migration agencies copy a list. We migrate a system.
Questions before you commit.
For standard migrations under 150k contacts, most are complete in 10 days from signed scope to first live send in Klaviyo. Enterprise accounts with complex integration dependencies take 3 to 4 weeks. The scope document you receive before signing will include a specific timeline with phase-by-phase dates.
No. We run a pre-migration and post-migration contact count reconciliation. If there is a discrepancy of any size, we identify the cause before you cut over. Suppression lists move first so your unsubscribes and hard bounces are protected from the start: no accidental sends to opted-out contacts.
Your old platform stays live and sending throughout the migration. We run a parallel period where Klaviyo flows are staged and tested but not yet live. Only after a full review passes on every flow do we flip the switch: and even then, we keep the old platform in place for 48 hours to confirm attribution is clean before decommissioning it.
Yes. Custom systems require a data export and mapping session before scoping. We will ask for a sample export and a breakdown of your data model: from there we can confirm feasibility and give you a fixed-fee estimate. Most custom migrations are possible with the right data access.
All migrations include a structured warm-up plan. If you follow the volume schedule and deliverability still drops, we diagnose and resolve it as part of the 30-day post-launch monitoring. Deliverability issues caused by sending outside the warm-up plan are outside scope, but we flag this clearly upfront so it never comes as a surprise.
Who this works for. Who it does not.
- Brands with 5k to 500k subscribers on any major email service provider ready to move to Klaviyo
- Ecommerce stores on Shopify, BigCommerce, or headless with at least 6 months of order data to back-load
- Teams who want a clean migration with zero surprises and a fixed budget
- Brands who want their new Klaviyo account built correctly from day one, not retrofitted later
- Brands who want a self-guided approach and to run the migration themselves: we scope and deliver, not coach
- Teams who need migration completed in under 5 days with no review phase: we do not cut corners on data integrity
- Business-to-business companies where Klaviyo is not the right email platform: we will tell you if that is the case
Not sure? Tell us your situation and we will be direct with you. Submit your brief
Map your migration path. No commitment. No pitch.
Tell us what platform you are on and the size of your list. We will confirm feasibility, flag any risks, and send a flat-fee proposal within 3 business days.
- Response within 48 hours
- Scoped proposal in 3 days
- 47 Klaviyo migrations delivered
- You own the Klaviyo account: always
Related services
Tell us about your migration
Call within 48 hours → proposal in 3 days → migration begins within 1 week of sign-off