What is a HubSpot Klaviyo integration?
A HubSpot Klaviyo integration is a two-way data connection that syncs contacts, lifecycle stage, lead score, and email or SMS engagement between HubSpot and Klaviyo in near real time. It keeps Klaviyo’s purchase and engagement data visible inside HubSpot and pushes HubSpot’s sales and lifecycle data back to Klaviyo for accurate segment targeting.
How does the HubSpot Klaviyo integration work?
It works through the HubSpot and Klaviyo REST APIs, using field mapping, deduplication, and a defined system of record for every object. When a record updates in either system, the sync writes the change to the other within minutes and bi-directional rules control which fields, like lifecycle stage or purchase history, flow in which direction.
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Does HubSpot have a native Klaviyo integration?
No. Unlike Shopify, Klaviyo has no first-party HubSpot connector. Third-party marketplace apps such as Unific and Skyvia handle basic contact and list sync, but they typically lack custom object support, lead score sync, and full campaign attribution. Teams that need those capabilities move to a custom-built integration.
How long does a HubSpot Klaviyo integration take to build?
A custom HubSpot Klaviyo integration takes about 8 weeks from kickoff to production. Discovery runs two weeks, build and staging tests run three weeks, historical backfill runs one week, and cutover with hypercare covers the final two weeks. Timelines extend for accounts with heavy customization or high contact volume.
Can HubSpot and Klaviyo sync bi-directionally?
Yes. Bi-directional sync is standard in a custom HubSpot Klaviyo integration. You define system of record at the field level, so Klaviyo-owned data like purchase history flows one way, HubSpot-owned data like lifecycle stage and lead score flows the other, and conflicts resolve by rule rather than by whoever updated last.
What data can sync between HubSpot and Klaviyo?
Contacts, custom HubSpot objects, lifecycle stage, lead score, purchase history, customer lifetime value, and email or SMS engagement events, plus opt-out and consent status. Field mapping is configured per project so only relevant data flows and each field has a clear owner, with custom fields supported through both platforms’ REST APIs.
How a HubSpot Klaviyo Integration Actually Works
A HubSpot Klaviyo integration works by giving each platform ownership of the data it generates natively, then syncing the rest. Klaviyo owns e-commerce truth: purchase history, product views, cart activity, and email or SMS engagement. HubSpot owns relationship truth: lifecycle stage, lead score, deal stage, and sales activity. The integration moves each system’s data into the other without overwriting the source of record.
Sync runs in both directions. A Klaviyo event like a completed purchase or a high-value abandoned cart writes into HubSpot as a contact property and can trigger a HubSpot workflow. A HubSpot event like a lifecycle stage change, a closed deal, or a resolved support ticket writes into Klaviyo as a custom property and can trigger a flow or move the contact into a segment.
Not every field syncs, and that is by design. You define field-level rules so a purchase amount always comes from Klaviyo and a lead score always comes from HubSpot, even though both systems can technically store a version of that data. This prevents the two most common sync failures: fields getting silently overwritten, and dashboards in each platform disagreeing with each other.
Three Ways to Connect Klaviyo and HubSpot
Not every team needs custom. Here is the honest comparison.
| Factor | Marketplace App (Unific, Skyvia) | Zapier / iPaaS | Custom (Integrate IQ) |
|---|---|---|---|
| Best for | Basic one-way list sync for small contact volumes | Simple, single-trigger automations | Complex, high-volume, multi-object sync at scale |
| Sync direction | Mostly one-way, HubSpot to Klaviyo | Configurable two-way, per zap | True bi-directional, field-level system of record |
| Custom objects/fields | Rarely supported | Supported per zap, but brittle at scale | Fully supported through both platforms’ APIs |
| Lead scoring and list-membership sync | Limited to standard profile properties | Manual mapping, breaks on schema changes | Built and maintained to your exact scoring and segment logic |
| Business logic | Fixed logic set by the vendor | If/then logic per zap, no real branching | Custom rules, conditional logic, exception handling |
| Volume handling | Caps at lower record counts | Rate-limited, can throttle at high volume | Built for 20B+ fields synced annually across our client base |
| Historical backfill | Rarely included | Not supported natively | One-time historical purchase and engagement sync included in scope |
| Maintenance | Vendor-managed, limited support | You maintain every zap yourself | We monitor, alert, and maintain the sync post-launch |
Klaviyo’s marketplace apps are fine if you only need one-way list sync at low contact volume. Zapier or another iPaaS covers simple, single-trigger automations without much custom logic behind them. Once you need bi-directional sync, custom objects, lead scoring, or sync at real volume, both approaches break down and a custom build is what holds up. Our custom HubSpot integration services are built for exactly that gap.
Revenue Workflows You Can Automate Once Klaviyo Data Lives in HubSpot
- MQL handoff with full engagement context. A HubSpot lead score crosses your threshold, triggering a task to the assigned rep that includes the contact’s last five Klaviyo email and SMS engagements plus any recent product views, so outreach starts with real context instead of a cold call.
- High-intent browse and cart alert. Klaviyo flags a high-value abandoned cart or repeat product view, and a HubSpot workflow creates a task for the account owner on B2B or wholesale accounts, catching deals that a marketing-only flow would let go cold.
- Nurture completion to sales handoff. A contact finishes a Klaviyo nurture flow without converting, and HubSpot updates their lifecycle stage and assigns a follow-up task, so sales picks up exactly where marketing left off.
- Suppression and consent sync. An unsubscribe or opt-out recorded in either HubSpot or Klaviyo writes back to the other system immediately, so a contact who opts out never gets re-added through the other platform.
- Event attendance to targeted flow. A contact registers for or attends a webinar tracked in HubSpot, and that event triggers a tailored Klaviyo flow built around what they attended, instead of a generic post-event blast.
What Breaks in a Klaviyo HubSpot Sync, and How We Prevent It
- Duplicate records and identity resolution. Guest checkouts, personal-versus-work emails, and repeat opt-ins create multiple Klaviyo profiles for one HubSpot contact. We match on a defined identity key set before any record is created, not after.
- System-of-record conflicts. Both platforms can technically store the same field. We assign one owner per field at the start of the build, so a purchase amount always comes from Klaviyo and a lead score always comes from HubSpot, regardless of which system touched it last.
- Field mapping and property drift. Custom properties renamed or restructured in either platform silently break a hardcoded sync. We build mapping as configuration, not hardcoded logic, so a schema change is a mapping update, not an emergency fix.
- Lead score and list-membership drift. Klaviyo and HubSpot each model scoring, list, and flow membership as their own object type. Without careful translation, scores stall and segment membership falls out of sync. We map both directions explicitly and monitor for drift after go-live.
- API rate limits at volume. Across our 300+ platform integrations we move over 20 billion fields annually, so we batch, checkpoint, and throttle syncs by design instead of by accident.
Implementation Timeline: What to Expect
Most HubSpot Klaviyo integrations complete inside eight weeks of kickoff. The first two weeks cover discovery: object inventory in both systems, field-by-field mapping, system of record decisions, and mapping which Klaviyo events, like purchases, flow completions, and list membership, actually matter to sales. Weeks three to five are build and unit testing against a staging Klaviyo account and a HubSpot sandbox. Week six runs the historical backfill and reconciliation. Weeks seven and eight cover user acceptance testing, cutover, and hypercare. Post-launch monitoring is included, so if a Klaviyo configuration changes or HubSpot pushes an API update, we see it before your reports do. Full detail is on our HubSpot integration process page and 98.5% of clients renew for a follow-on scope.
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Connect the Rest of Your Revenue Stack
Klaviyo rarely runs alone. If your orders live in an e-commerce platform, a HubSpot Shopify integration keeps order and inventory data flowing into the same contact record. Finance teams running a backend ERP often pair this with a HubSpot NetSuite integration for invoice and revenue visibility. If you are still weighing Klaviyo against HubSpot’s own marketing tools, our HubSpot vs Klaviyo comparison breaks down where each one wins. To see how we scope and deliver a build like this, walk through our HubSpot integration process and run the numbers yourself with our integration ROI calculator .
Table of Contents
- What is a HubSpot Klaviyo integration?
- How does the HubSpot Klaviyo integration work?
- Does HubSpot have a native Klaviyo integration?
- How long does a HubSpot Klaviyo integration take to build?
- Can HubSpot and Klaviyo sync bi-directionally?
- What data can sync between HubSpot and Klaviyo?
- How a HubSpot Klaviyo Integration Actually Works
- Three Ways to Connect Klaviyo and HubSpot
- Revenue Workflows You Can Automate Once Klaviyo Data Lives in HubSpot
- What Breaks in a Klaviyo HubSpot Sync, and How We Prevent It
- Implementation Timeline: What to Expect
- Connect the Rest of Your Revenue Stack
