Custom engineered Marketing & Content integration

Klaviyo & HubSpot integration

Custom engineered for your business by SpotDev's accredited developers

Connect Klaviyo to HubSpot so consumer buyers stay in Klaviyo flows, B2B and wholesale contacts stay in HubSpot, and consent, suppression and subscription status match in both systems on a 15-minute schedule.

  • £4k typical investment
  • API key

Why connect Klaviyo to HubSpot

Retailers that add a trade or wholesale arm often end up with consumers in Klaviyo and business buyers in HubSpot, and the same person turns up in both with different consent.

  • A wholesale buyer receives consumer promotions because the two audiences were never separated by rule.
  • An unsubscribe in one platform is not reflected in the other, so suppressed contacts keep getting email.
  • Sales cannot see a trade customer's order and email engagement history held in Klaviyo.
  • Segments defined in Klaviyo cannot be used in HubSpot workflows.

What you can do with Klaviyo and HubSpot

The integration uses Klaviyo's REST API (JSON:API standard) with a scoped private API key, and HubSpot's CRM API.

  • Klaviyo profiles and HubSpot contacts are matched by email, with an ownership rule deciding which platform is allowed to create or update each audience.
  • Email and SMS consent uses Klaviyo's subscribe, unsubscribe and suppress endpoints, so a HubSpot opt-out suppresses the Klaviyo profile and a Klaviyo unsubscribe updates HubSpot subscription status.
  • Klaviyo list and segment membership is written to HubSpot properties for use in lists and workflows.
  • Klaviyo events, such as placed orders and email clicks, appear on the HubSpot contact timeline for the sales team.

How the Klaviyo & HubSpot integration works

Two-way sync
Sync direction between Klaviyo and HubSpot
15 min sync
How often data updates flow
API key
Secure authentication method
Contacts, Lists/Segments, Events
Records kept in sync
Marketing Hub, Sales Hub
HubSpot hubs supported

Typical setup

  1. Connect Klaviyo and HubSpot
  2. Agree audience ownership and exclusion rules
  3. Map consent and subscription fields
  4. Enable scheduled sync
  5. Verify segments in both systems

Integration Impact Analysis

With Integration

  • Streamlined operationsAutomated workflows replace manual processes
  • Single source of truthConsistent data across all revenue teams

Without Integration

  • Manual processesTeams managing tools instead of revenue
  • Data silosCritical insights trapped in silos

Klaviyo & HubSpot integration: FAQs

Does Klaviyo have an API HubSpot can connect to?
Yes. Klaviyo's API is REST-based and follows the JSON:API standard. Server-side calls authenticate with a private API key sent in the Authorization header, with read-only, full or custom scopes. The Profiles API covers create, update and retrieval, plus subscribe, unsubscribe and suppression endpoints, and Klaviyo also offers webhooks.
There is a Klaviyo app on the HubSpot marketplace. Do we need custom work?
The marketplace app, built and maintained by KAV Labs, syncs contacts two-way and shows Klaviyo email activity on the HubSpot timeline. Custom work is about audience governance: rules for which contacts belong in which system, consent handling that matches your legal basis, and Shopify or other order data in the same flow. If the app covers your case we will say so at scoping.
How is consent kept consistent between Klaviyo and HubSpot?
Klaviyo holds a consent status per channel (subscribed, never subscribed, unsubscribed) plus a separate suppression flag. We map those to HubSpot's subscription types so an opt-out on either side is applied on the other within the 15-minute sync window, and suppressed profiles are never re-subscribed by the sync.
How much does a Klaviyo HubSpot integration cost?
From £4k for a governed contact and consent sync. The timeline depends on scope and is set at scoping, along with a fixed quote.

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