Real-time
Two-way sync
Changes in Customer.io or HubSpot instantly reflect in both systems. No stale data, no manual imports.
Business productivity ⇄ CRM
Customer.io to HubSpot integration — real-time, two-way sync
Keep Customer.io and HubSpot 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
Case study
Migrated from Mulesoft
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Migrated from Celigo
Migrated from Heroku Connect
Migrated from Matillion
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Migrated from Fivetran
Case study
Migrated from Celigo
Why teams connect Customer.io and HubSpot
Sync what happens in Customer.io 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 Customer.io 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 Deliveries / Messages, Newsletters, People, Objects in Customer.io to Ticket, Quote, Goal, Owner in HubSpot with bi-directional, real-time sync. Activity and record changes in Customer.io update the matching contact or account in HubSpot, and CRM data flows the other way wherever Customer.io can store and use it.
Common use cases
- Push CRM segments and lead status into Customer.io so messaging respects sales stage.
- Land delivery and engagement events (sent, opened, clicked, bounced) from reporting webhooks into a warehouse for attribution analysis.
- Sync HubSpot Tickets with an internal support database to unify service reporting across channels.
- Push product signup and usage events into HubSpot contact properties to drive lifecycle marketing segmentation.
Where Customer.io processes payments
Charges, refunds, and subscription changes appear on the account in HubSpot, so revenue context lives with the relationship.
Where Customer.io can store CRM context: fields kept current
Owner, lifecycle stage, or account details from HubSpot sync into Customer.io, so people working there have the context without switching tools.
Where Customer.io handles support or shared inboxes
Tickets and conversations attach to the right contact and account in HubSpot, so sales sees open issues before the next call.
What you can sync between Customer.io and HubSpot
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.
| Customer.io objects | HubSpot objects | |
|---|---|---|
| Objects Non-person entities such as accounts or companies, related to people for account-level messaging. | Contact Synced with incremental and full sync per the Stacksync docs. | |
| Events Behavioral events sent via the Track API that trigger campaigns. | Company Synced with incremental and full sync per the Stacksync docs. | |
| Segments Attribute- or event-based groups; data syncs feed the attributes segments evaluate. | Deal Synced with incremental and full sync per the Stacksync docs. | |
| Campaigns Automated workflows whose membership and metrics can be read via the App API. | Line Item Synced with incremental and full sync per the Stacksync docs. | |
| Broadcasts One-off sends to segments or audiences, triggerable via API. | Product Synced with incremental and full sync per the Stacksync docs. | |
| Deliveries / Messages Per-recipient message records whose lifecycle events flow out through reporting webhooks. | Ticket Synced with incremental and full sync per the Stacksync docs. |
What ships with Customer.io ⇄ HubSpot
Connect Customer.io and HubSpot for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Customer.io–HubSpot connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Customer.io or HubSpot 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 Customer.io or HubSpot record.
Observability
Monitoring
Track your Customer.io ⇄ HubSpot sync health, view errors, and replay failed events in one click.
Trading partners
EDI
Transform legacy EDI complexity into simple database interactions between Customer.io and HubSpot.
How the Customer.io and HubSpot connectors work
Customer.io
- Integration surface
- REST APIs split by purpose: Track API for data ingestion, App API for campaigns, people lookups, and messages
- Authentication
- Basic auth with site ID and API key for the Track API; bearer token for the App API
- Change detection
- Reporting webhooks push message and delivery events; person attribute changes are not streamed and require source-side detection
- Capabilities
- read · write · webhooks
- Rate limits
- Subject to per-API rate limits documented by Customer.io
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.
How it works
How to connect Customer.io to HubSpot — 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.
- 01
Connect your apps
Authenticate Customer.io and HubSpot with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.
Customer.io
connected
HubSpot
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Customer.io and HubSpot 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.
objects · Customer.io ⇄ HubSpotCustomers 12,480Sales Orders 8,213Invoices 5,902Items 1,344 - 03
Map fields
Fields map automatically even when names and types differ. Stacksync handles transformation and type casting for you, zero configuration required.
Customer.io HubSpotCompany company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Customer.io and HubSpot integration FAQ
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Yes. Stacksync provides a managed, real-time two-way integration between Customer.io and HubSpot: authenticate both systems, choose the objects to sync (such as Customer.io's Objects and Events), map fields visually, and changes propagate both ways in milliseconds — no code required.
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Yes — Stacksync ships production-grade connectors for both Customer.io and HubSpot. The connectors handle authentication, schema detection, rate limits, and retries; you configure the sync, and Stacksync operates it.
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Change detection on Customer.io: Reporting webhooks push message and delivery events; person attribute changes are not streamed and require source-side detection. On HubSpot: Records: incremental near-real-time change tracking. Associations: HubSpot has no native association CDC. Each detected change propagates to the other side in milliseconds, with field-level conflict resolution and an inspectable event log.
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On the Customer.io side: Deliveries / Messages, Newsletters, People, Objects, plus custom fields where Customer.io exposes them. On the HubSpot side: Ticket, Quote, Goal, Owner. Stacksync auto-detects both schemas and converts types between the two systems.
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Yes. Each object mapping can be bidirectional or restricted to a single direction (both systems accept writes). Read-only mirrors, one-way pushes, and full two-way sync can be mixed in the same integration.
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Common patterns for Customer.io and HubSpot: Where Customer.io processes payments; Where Customer.io can store CRM context: fields kept current; Where Customer.io handles support or shared inboxes. Charges, refunds, and subscription changes appear on the account in HubSpot, so revenue context lives with the relationship.
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.
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:
Related integrations
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No integrations match .
