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Business productivity

Connect Klaviyo to any app with two-way sync.

Two-way sync Klaviyo across all your CRMs, databases, data warehouses, EDI systems, and AI tools, with custom workflows tailored to your data.

  • 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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Object catalog

What Stacksync syncs in Klaviyo.

These objects sync between Klaviyo and any connected system, with field-level mapping and conflict resolution. Custom fields are picked up from the live schema where Klaviyo exposes them.

Profiles
Person records with arbitrary custom properties are the target for CRM and warehouse-sourced attributes.
Lists
Static audience memberships sync in from CRMs and forms for targeting.
Segments
Dynamic audiences are readable so other tools can mirror who qualifies.
Events
Timestamped behavioral records tied to metrics; external order and product events are pushed in to trigger flows.
Metrics
Event type definitions organize the activity stream used in segmentation and attribution.
Campaigns
Email and SMS sends expose performance data for warehouse-based reporting.
Flows
Automation definitions and their engagement data sync outward for attribution.
Templates
Message templates are accessible via API for content management workflows.
Catalog Items
Product catalog records synced from an ERP or PIM power product blocks and back-in-stock triggers.
Tags
Organizational labels on campaigns, flows, and lists support reporting rollups.
API surface

How Stacksync connects to Klaviyo.

The connector runs on Klaviyo's native API. Stacksync manages authentication, rate limits, retries, and schema changes so your team does not maintain integration code.

Connection
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
Rate limits
Per-endpoint burst and steady rate limits apply

Sync directions

  • Read Supported
  • Write Supported
  • Change data capture Not available
  • Webhooks Supported
What ships with Klaviyo

Connect Klaviyo for flexible, real-time data sync.

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

Real-time

Two-way sync

Changes in Klaviyo instantly reflect across connected systems. No stale data, no manual imports.

No-code + pro-code

Workflow automation

Trigger automated workflows whenever 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 Klaviyo record.

Observability

Monitoring

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

Trading partners

EDI

Transform legacy EDI complexity into simple database interactions.

Use cases

What teams run on the Klaviyo connector.

Klaviyo is bought by lifecycle and retention marketers and marketing ops at e-commerce brands; the vendor now positions it as a B2C CRM that unifies customer data and automates email, SMS, and push. Its Profiles and Events store acts as a de facto customer data layer for the brand, so data gravity is high: segmentation and flow quality depend directly on what commerce, ERP, and warehouse systems feed into it.

  • Lifecycle and retention marketers
  • E-commerce ops
  • Marketing ops
  • Data engineering

  1. Sync customer profiles between Klaviyo and the CRM or warehouse so segments can use fields beyond storefront data

  2. Push offline, ERP, or subscription order events into Klaviyo as metrics to trigger post-purchase and win-back flows

  3. Mirror campaign and flow engagement events into a warehouse for revenue attribution alongside order data

  4. Keep suppression and consent status consistent between Klaviyo and other email or SMS tools

  5. Sync catalog items from an ERP or PIM so product recommendations and back-in-stock flows use current data

  6. Sync customer records from a warehouse, ERP, or operational database into Profiles and custom properties so Segments and Flows run on complete, current data.

All Klaviyo integrations

Pick the system you need to keep in sync with Klaviyo. Each page covers the sync setup, field mapping, and common workflows for that pair.

CRM · 44

ERP · 39

Database · 48

Data warehouse · 29

Business productivity · 34

Accounting and finance · 15

How it works

Set up Klaviyo in minutes, without APIs.

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 Klaviyo with its 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
    Klaviyo connected
    OAuth 2.0
    SSH tunnel
    SSL certificate
    VPC peering
  2. 02

    Choose tables

    Pick the Klaviyo objects to sync — Stacksync auto-detects the schema, 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 · 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
    Klaviyo database
    Company company_name text
    Email email text
    Amount amount numeric
    Created created_at timestamp
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FAQ

Klaviyo connector FAQ

What can I sync with the Klaviyo connector?

Klaviyo's core objects — Profiles, Lists, Segments, Events and custom fields — can sync with any of 302 other systems. Every integration is real-time and bidirectional, with field-level mapping and conflict resolution.

How does Stacksync connect to Klaviyo?

Via REST API compliant with the JSON:API specification, authenticated with OAuth 2.0 for apps or private API keys. Changes are detected as follows — polling on updated timestamps; outbound webhooks exist for event topics (availability depends on plan or app-partner status) and as flow webhook actions. Stacksync manages rate limits, retries, and schema changes automatically.

Is the Klaviyo connector two-way?

Yes. Changes made in Klaviyo propagate to the connected system and vice versa, in milliseconds. One-way flows are also supported when a direction should stay read-only.

How long does a Klaviyo integration take to set up?

Most Klaviyo integrations go live in minutes: authenticate Klaviyo and the other system, pick objects and fields, and enable the sync. No code and no infrastructure to manage.

Is Klaviyo data secure in transit?

Stacksync is SOC 2 Type II, ISO 27001, GDPR and HIPAA compliant. Klaviyo data is encrypted in transit, and a zero-persistent-storage architecture means records are not retained after a sync operation.

SECURITY

Security teams trust 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
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