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CRM ⇄ Business productivity

HubSpot to Klaviyo integration — real-time, two-way sync

Keep HubSpot and Klaviyo in sync without custom scripts. Cut weeks of integration work, eliminate silent data drift, and give your team a single, reliable source of truth.

  • SOC 2 and 6 other compliance frameworks
  • POC with real engineers in minutes

Adopted by fast-scaling companies moving mission-critical data in real time

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Why teams connect HubSpot and Klaviyo

Sync what happens in Klaviyo with the customer records in HubSpot, in real time and in both directions.

The CRM is supposed to be the record of every customer relationship, but customer-relevant information also accumulates in the other tools a team runs. Whatever Klaviyo holds or produces that touches a customer, whether conversations, payments, replies, enriched data, or notes, the CRM only benefits if it arrives without someone copying it over.

Stacksync connects Catalog Items, Tags, Profiles, Lists in Klaviyo to Stages, Audit, Contact, Company in HubSpot with bi-directional, real-time sync. Activity and record changes in Klaviyo update the matching contact or account in HubSpot, and CRM data flows the other way wherever Klaviyo can store and use it.

Common use cases

  • Sync catalog items from an ERP or PIM so product recommendations and back-in-stock flows use current data
  • Sync customer profiles between Klaviyo and the CRM or warehouse so segments can use fields beyond storefront data
  • Push product signup and usage events into HubSpot contact properties to drive lifecycle marketing segmentation.
  • Write warehouse-computed lead and account scores back to HubSpot properties on a schedule or in near real time.

Where Klaviyo can store CRM context: fields kept current

Owner, lifecycle stage, or account details from HubSpot sync into Klaviyo, so people working there have the context without switching tools.

Where Klaviyo runs outreach

Prospects, sends, and replies sync into HubSpot, keeping lead status current without manual imports.

Where Klaviyo supplies contact or company data

Enriched fields land directly on records in HubSpot, and refreshes keep them from going stale.

What you can sync between HubSpot and Klaviyo

Representative objects on each side — any object or custom field can map to any target. Schemas are auto-detected; types are converted between the two systems.

HubSpot objects Klaviyo objects
Ticket Synced with incremental and full sync per the Stacksync docs. Flows Automation definitions and their engagement data sync outward for attribution.
Quote Synced with incremental and full sync per the Stacksync docs. Templates Message templates are accessible via API for content management workflows.
Goal Synced with incremental and full sync per the Stacksync docs. Catalog Items Product catalog records synced from an ERP or PIM power product blocks and back-in-stock triggers.
Owner Synced with incremental and full sync per the Stacksync docs. Tags Organizational labels on campaigns, flows, and lists support reporting rollups.
Pipeline Synced with incremental and full sync per the Stacksync docs. Profiles Person records with arbitrary custom properties are the target for CRM and warehouse-sourced attributes.
Stages Synced with incremental and full sync per the Stacksync docs. Lists Static audience memberships sync in from CRMs and forms for targeting.
What ships with HubSpot ⇄ Klaviyo

Connect HubSpot and Klaviyo for flexible, real-time data sync.

Real-time sync, workflow automation, event queues, EDI, and monitoring, for every HubSpot–Klaviyo connection.

Real-time

Two-way sync

Changes in HubSpot or Klaviyo instantly reflect in both systems. No stale data, no manual imports.

No-code + pro-code

Workflow automation

Trigger automated workflows whenever HubSpot or Klaviyo data changes, update records, fire webhooks, or kick off sequences without brittle API scripts.

At scale

Event queues

Handle millions of events per minute without losing a single HubSpot or Klaviyo record.

Observability

Monitoring

Track your HubSpot ⇄ Klaviyo sync health, view errors, and replay failed events in one click.

Trading partners

EDI

Transform legacy EDI complexity into simple database interactions between HubSpot and Klaviyo.

How the HubSpot and Klaviyo connectors work

HubSpot

Integration surface
REST API (CRM v3)
Authentication
OAuth (choose HubSpot account and authorize Stacksync); requires a HubSpot 'Super Admin' to grant access; optional "Grant access to sensitive fields" checkbox for sensitive/highly sensitive fields
Change detection
Records: incremental near-real-time change tracking. Associations: HubSpot has no native association CDC
Capabilities
read · write · CDC · webhooks
Rate limits
Request limits vary by subscription tier and API type.
HubSpot setup guide

Klaviyo

Integration surface
REST API compliant with the JSON:API specification
Authentication
OAuth 2.0 for apps or private API keys
Change detection
Polling on updated timestamps; outbound webhooks exist for event topics (availability depends on plan or app-partner status) and as flow webhook actions
Capabilities
read · write · webhooks
Rate limits
Per-endpoint burst and steady rate limits apply
How it works

How to connect HubSpot to Klaviyo — three steps, no code

Configure and sync within minutes, no code. Whether you sync 50k or 100M+ records, Stacksync handles the queues, infra, and plumbing. Integrations are non-invasive and need zero setup on your systems.

  1. 01

    Connect your apps

    Authenticate HubSpot and Klaviyo with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.

    • OAuth 2.0
    • SSH tunnel
    • VPC peering
    HubSpot connected
    Klaviyo connected
    OAuth 2.0
    SSH tunnel
    SSL certificate
    VPC peering
  2. 02

    Choose tables

    Pick the HubSpot and Klaviyo objects to sync — Stacksync auto-detects both schemas, including custom fields where the platform exposes them. Sync to existing tables, or let Stacksync create new ones with ideal data types.

    • Standard objects
    • Custom objects
    • Auto-schema
    objects · HubSpot ⇄ Klaviyo
    Customers 12,480
    Sales Orders 8,213
    Invoices 5,902
    Items 1,344
  3. 03

    Map fields

    Fields map automatically even when names and types differ. Stacksync handles transformation and type casting for you, zero configuration required.

    • Auto-map
    • Type casting
    • Transforms
    HubSpot Klaviyo
    Company company_name text
    Email email text
    Amount amount numeric
    Created created_at timestamp
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FAQ

HubSpot and Klaviyo integration FAQ

SECURITY

Security teams love Stacksync

As a data company, we understand the importance of keeping your data secure. Stacksync is built with security best practices to keep your data safe at every layer, and is DPF-certified for US, EU, UK and CH data transfers.

Learn more about security
SOC 2 type II
ISO 27001
HIPAA BAA
GDPR
CCPA
CSA STAR
DPF US-EU-UK-CH
→ SECURITY WITH BENEFITS

SSO & SCIM

Let your users access Stacksync from your centralized user management systems. Works with Okta, Azure, Google SSO and more.

Alerts

Immediately get alerted about record syncing issues over email, Slack, PagerDuty and WhatsApp. Resolve issues from a centralized dashboard with retry and revert options.

Secure connection options

Securely connects to your systems with:

OAuth 2 SSH Tunnelling SSL certificates IP Whitelisting VPN gateway VPC peering and more

Related integrations

Every pair below is a real-time, two-way sync. Search all 386 integrations available for HubSpot and Klaviyo.

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