HubSpot + Klaviyo: Synchronizing E-Commerce Events and Segments Between Platforms

HubSpot manages sales and CRM. Klaviyo manages email marketing and buyer behavioral data. The pairing is logical: a manager in HubSpot sees that a contact has purchased three times, abandoned their cart last week, and opened the last 8 emails — a hot upsell lead. Klaviyo sees that a contact moved to “Customer” status in HubSpot and automatically adds them to an onboarding sequence. There is no native integration between Klaviyo and HubSpot. All available solutions are third-party tools with significant limitations. Here is what actually works.

Why There Is No Native Klaviyo and HubSpot Integration

Klaviyo and HubSpot are competing platforms on the marketing automation side. HubSpot has its own Marketing Hub with email marketing, sequences, and segmentation. Klaviyo specializes in e-commerce email and SMS. Both platforms have a business interest in keeping clients within their own toolset — there is no native two-way integration for strategic reasons.

Third-party tools are the only options for synchronization: Skyvia, Zapier, Make — each with its own limitations on data types and sync frequency.

Different Data Models: The Core Technical Problem

Klaviyo and HubSpot take fundamentally different approaches to customer data:

Klaviyo — e-commerce CDP:

• Central object: Profile (buyer)
• Data: behavioral events, purchase history, email activity, predictive analytics
• Segmentation: based on events and predictive metrics (LTV, churn probability)
• Consent: its own subscription and opt-in model

HubSpot — CRM platform:

• Central object: Contact
• Data: contact properties, activities, deals, team interactions
• Segmentation: Lists based on properties and activities
• Consent: GDPR Tools with its own consent logic

This difference creates specific sync problems that cannot be solved with a simple connector.

What Does Not Work When Syncing via Zapier and Third-Party Tools

Klaviyo E-Commerce Events Are Not Converted into HubSpot

Klaviyo operates on rich buyer behavior events:

• Placed Order — purchase completed
• Ordered Product — specific product purchased
• Viewed Product — product viewed
• Added to Cart — added to cart
• Started Checkout — checkout initiated
• Abandoned Cart — cart abandoned
• Fulfilled Order — order fulfilled

HubSpot has no built-in equivalents for these events. To store them, either HubSpot custom behavioral events (only available on Enterprise) or custom contact properties are required. Zapier passes these events as text in Notes — they do not become structured data that can be used for segmentation or Workflow triggers.

Klaviyo Segments Cannot Be Directly Imported into HubSpot Lists

Klaviyo segments are built on predictive metrics and behavioral events. HubSpot Lists are built on contact properties. The filtering logic is fundamentally different — a segment like “Buyers with high predicted LTV who have not opened emails in 30 days” in Klaviyo cannot be reproduced in HubSpot without syncing the metrics themselves as contact properties.

GDPR and Subscription Status Problem

Klaviyo stores subscription status and consent history with timestamps. HubSpot has its own GDPR Tools with separate consent logic. Direct sync of subscription status without accounting for both consent models can create compliance risks: a contact who unsubscribed in Klaviyo continues to receive emails via HubSpot, or vice versa.

What the Custom Integration from Exceltic.dev Solves

• E-commerce events as contact properties — Placed Order, Abandoned Cart, Viewed Product are recorded as custom HubSpot properties: Last Order Date, Total Orders, Cart Abandoned Date, Last Product Viewed — Workflows and segmentation run on these fields
• Klaviyo LTV and predictive metrics in HubSpot — Predicted LTV, Expected Date of Next Order, Churn Risk from Klaviyo are synced as numeric contact properties in HubSpot — the manager sees the client’s value directly in the card
• Two-way segment synchronization — contacts from Klaviyo segments are automatically added to corresponding HubSpot Lists; a lifecycle stage change in HubSpot triggers enrollment in a Klaviyo list
• Lifecycle stage synchronization — a contact becomes Customer in HubSpot after the first purchase via a Klaviyo event; a contact receives the tag VIP in Klaviyo when the manager marks a deal as won in HubSpot
• Correct consent synchronization — subscription status is synced accounting for both consent models: unsubscribing in either platform immediately updates the status in both systems
• Workflow triggers — Klaviyo e-commerce events become triggers for HubSpot Workflows: an abandoned cart creates a Task for the manager, the third purchase triggers enrollment in an upsell sequence
• Purchase history in the timeline — each purchase from Klaviyo is logged as an activity in the HubSpot contact timeline with amount, products, and date

How the Integration Works — Technical Process

Connection Architecture

The integration is built on a two-way stack: Klaviyo Webhooks and API — Exceltic middleware — HubSpot API and HubSpot Webhooks — Exceltic middleware — Klaviyo API. Authentication with Klaviyo via Private API Key. Authentication with HubSpot via OAuth2 Private App.

Step-by-Step Scenario: Buyer Abandons Cart

1. Buyer adds items to cart and leaves the site
2. Klaviyo records the Abandoned Cart event and sends a webhook
3. Middleware receives the payload: buyer email, cart items, amount
4. Search for contact in HubSpot: GET /crm/v3/objects/contacts?email={email}
5. Update contact properties: Cart Abandoned Date, Abandoned Cart Value, Abandoned Products
6. Create a Task for the manager if Abandoned Cart Value exceeds a threshold (e.g., $500): POST /crm/v3/objects/tasks
7. Enroll the contact in the HubSpot Workflow “Abandoned Cart — High Value”

Step-by-Step Scenario: Contact Becomes a Customer in HubSpot

1. Manager closes a deal in HubSpot — Deal Stage changes to Closed Won
2. HubSpot sends the deal.propertyChange webhook
3. Middleware identifies the associated contact via the HubSpot API
4. The Klaviyo profile custom property is updated: CRM Status = Customer
5. Contact is added to the Klaviyo list New Customers for the onboarding sequence: POST /api/lists/{list_id}/relationships/profiles
6. If the contact was previously in the Leads list — they are removed from it

LTV and Predictive Metric Synchronization

Klaviyo calculates predictive metrics for each profile. The integration syncs them into HubSpot as numeric properties on a schedule (once every 24 hours).

Real-World Case

E-commerce company, B2C and B2B sales, Klaviyo for mass marketing, HubSpot for working with corporate clients.

The company used Klaviyo for automated email campaigns and HubSpot for manager-led engagement with corporate buyers. Data existed in silos: a HubSpot manager could not see a client’s purchase history from Klaviyo, did not know their LTV, and received no signals about behavioral triggers. Klaviyo did not know which buyers had already become corporate clients and sent them the same emails as regular retail buyers.

The concrete pain: a corporate client with $15,000 LTV received standard promotional emails instead of personalized ones. The manager did not know the client had been browsing a new product category for several days — a potential upsell was missed.

After connecting the custom integration: LTV and purchase history from Klaviyo are visible in the HubSpot contact card. Browsing a new product category creates a Task for the manager. Corporate clients are automatically excluded from mass promo campaigns in Klaviyo and placed into a separate segment for personalized communications.

Result: managers closed 3 upsell deals in the first month based on behavioral signals from Klaviyo, corporate clients were excluded from irrelevant campaigns, and GDPR compliance risk was eliminated through correct consent synchronization.

Which Businesses This Suits

The integration is most relevant for e-commerce companies with a dedicated sales team — where mass marketing runs through Klaviyo and personal sales run through HubSpot. Typical scenarios: B2B e-commerce, wholesale sales, SaaS with a freemium model where free users are managed in Klaviyo and paid clients are handed off to HubSpot.

Critically important for companies with a high average order value where behavioral signals (product views, cart additions, repeat visits) are meaningful indicators of purchase readiness and need to reach the manager in time.

Frequently Asked Questions

Why is there no native Klaviyo and HubSpot integration?
Klaviyo and HubSpot compete on the marketing automation side — both platforms have their own email marketing and segmentation tools. Building a deep native integration conflicts with both companies’ business interests. Klaviyo focuses on native integrations with e-commerce platforms (Shopify, WooCommerce, Magento), not with CRM competitors.

How is the GDPR problem resolved in two-way synchronization?
The custom integration implements the “least permissive status” principle: if a contact unsubscribes in either platform — the status is immediately updated in both. Synchronization happens in real time via webhooks from both platforms. Additionally, a log of all consent changes with timestamps is maintained for audit purposes.

Which Klaviyo predictive metrics can be passed to HubSpot?
Klaviyo provides via API: predicted_clv (predicted LTV), historic_clv (historical LTV), expected_date_of_next_order (expected date of next order), total_order_count (number of orders), average_order_value (average order value). All of these metrics are synced into custom numeric HubSpot properties and used for segmentation and prioritization.

Can HubSpot Workflows be triggered by Klaviyo events?
Not directly — HubSpot Workflows do not support external webhook triggers on standard plans. The custom integration solves this by updating contact properties: a Klaviyo event updates a contact property in HubSpot (e.g., Abandoned Cart = true), and the HubSpot Workflow triggers on the change of that property.

How long does Klaviyo and HubSpot integration development take?
A basic integration with one-way profile sync and core events — 4–5 working days. A full two-way integration with LTV metrics, segment synchronization, consent logic, and Workflow triggers — 8–12 working days. Exceltic.dev determines exact timelines after a technical brief.

If you want to combine Klaviyo behavioral data with HubSpot CRM data — describe the task to the Exceltic.dev team. We will design the integration architecture for your e-commerce model.