Real-time
Two-way sync
Changes in HubSpot or Kustomer instantly reflect in both systems. No stale data, no manual imports.
CRM
HubSpot to Kustomer integration — real-time, two-way sync
Keep HubSpot and Kustomer 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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Migrated from MuleSoft
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Migrated from Fivetran
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Migrated from Celigo
Why teams connect HubSpot and Kustomer
Run HubSpot and Kustomer side by side with the same accounts and contacts in both, whether they serve different teams or one is replacing the other.
Two CRMs in one company is more common than anyone plans for: an acquisition brings its own system, regions or business units standardize differently, or a migration is under way and both are live. In every case, some of the same companies and people exist in both systems, and every day of manual double entry pushes the copies further apart.
Stacksync syncs Pipeline, Stages, Audit, Contact in HubSpot with Tags, Notes, Customers, Conversations in Kustomer in real time and in both directions, with field-level mapping and matching on identifiers you choose. Update a record in either CRM and the other reflects it within seconds.
Common use cases
- 01 Write warehouse-computed lead and account scores back to HubSpot properties on a schedule or in near real time.
- 02 Sync HubSpot Tickets with an internal support database to unify service reporting across channels.
- 03 Keep customer attributes updated from billing systems so routing rules and SLAs reflect account value
- 04 Escalate conversation-derived signals into the CRM as tasks or opportunities
Common sync patterns
Where both track pipeline: deal visibility across systems
Deal stage and value on shared accounts stay visible from either CRM.
Post-acquisition consolidation
Keep both CRMs accurate while the merged team decides on a target system, instead of freezing one and losing months of updates.
Migration with a parallel run
When one CRM is replacing the other, run both fully live until cutover, with no snapshot gap and no data freeze.
What you can sync between HubSpot and Kustomer
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 | Kustomer objects | How this pairing syncs | |
|---|---|---|---|
| Company Synced with incremental and full sync per the Stacksync docs. | Companies Organization records group customers and map to CRM accounts. | Same entity on both sides — records pair one-to-one and field-level changes reconcile in both directions. Custom fields on either side are included in the mapping. | |
| Contact Synced with incremental and full sync per the Stacksync docs. | Teams Team assignments support routing parity and reporting. | Contact is specific to HubSpot and Teams to Kustomer — each maps to any object or custom field on the other side. | |
| Deal Synced with incremental and full sync per the Stacksync docs. | Tags Labels on conversations and customers sync for categorization and analytics. | Deal is specific to HubSpot and Tags to Kustomer — each maps to any object or custom field on the other side. | |
| Line Item Synced with incremental and full sync per the Stacksync docs. | Notes Internal annotations carry context alongside synced conversations. | Line Item is specific to HubSpot and Notes to Kustomer — each maps to any object or custom field on the other side. | |
| Product Synced with incremental and full sync per the Stacksync docs. | Customers The central record whose timeline aggregates every interaction; external attributes sync onto it. | Product is specific to HubSpot and Customers to Kustomer — each maps to any object or custom field on the other side. | |
| Ticket Synced with incremental and full sync per the Stacksync docs. | Conversations Support threads across channels sync outward for analytics and CRM context. | Ticket is specific to HubSpot and Conversations to Kustomer — each maps to any object or custom field on the other side. |
How changes propagate between HubSpot and Kustomer
Each direction of the sync is driven by what the source system can signal and what the destination accepts — detection, delivery, and expected latency below.
HubSpot Kustomer Sub-second propagation
DetectionHubSpot pushes changes as they happen — webhook events backed by change data capture. Records: incremental near-real-time change tracking.
DeliveryEach detected change is written to Kustomer through its API, with automatic retries and rate-limit backoff.
Kustomer HubSpot Sub-second propagation
DetectionKustomer notifies Stacksync of record changes through webhook events. Outbound webhooks on record events, plus polling for backfill.
DeliveryEach detected change is written to HubSpot through its API, with automatic retries and rate-limit backoff.
Rate-limit considerations
- HubSpot: Request limits vary by subscription tier and API type.
- Kustomer: Subject to the platform's API rate limits.
What ships with HubSpot ⇄ Kustomer
Connect HubSpot and Kustomer for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every HubSpot–Kustomer connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever HubSpot or Kustomer 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 Kustomer record.
Observability
Monitoring
Track your HubSpot ⇄ Kustomer 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 Kustomer.
How the HubSpot and Kustomer 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.
Kustomer
- Integration surface
- REST API
- Authentication
- API key used as a bearer token, scoped by role
- Change detection
- Outbound webhooks on record events, plus polling for backfill
- Capabilities
- read · write · webhooks
- Rate limits
- Subject to the platform's API rate limits
How it works
How to connect HubSpot to Kustomer — 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 HubSpot and Kustomer with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.
HubSpot
connected
Kustomer
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the HubSpot and Kustomer 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 · HubSpot ⇄ KustomerCustomers 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.
HubSpot KustomerCompany company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
HubSpot and Kustomer integration FAQ
-
Yes. Stacksync provides a managed, real-time two-way integration between HubSpot and Kustomer: authenticate both systems, choose the objects to sync (such as HubSpot's Company and Contact), map fields visually, and changes propagate both ways in milliseconds — no code required.
-
HubSpot: 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. Kustomer: REST API. Authentication: API key used as a bearer token, scoped by role. Stacksync manages authentication, retries, and rate limits on both sides.
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HubSpot: All CRM objects share a single property-based schema model, and relationships are expressed as typed associations rather than foreign keys, so syncs replicate associations explicitly. Kustomer: Custom object types are called Klasses, and they are the standard mechanism for landing external data like orders and subscriptions where agents work. Stacksync's field mapping accounts for these differences between HubSpot and Kustomer without custom code.
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Stacksync is SOC 2 Type II and ISO 27001 certified with HIPAA BAA support. Data is encrypted in transit, and a zero-persistent-storage architecture means HubSpot and Kustomer records are not retained after a sync operation.
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Stacksync pricing is usage-based and starts at $1,000/month, including the managed HubSpot and Kustomer connectors, real-time two-way sync, monitoring, and support. That replaces building and maintaining a custom HubSpot–Kustomer integration in-house.
-
Yes — Stacksync ships production-grade connectors for both HubSpot and Kustomer. The connectors handle authentication, schema detection, rate limits, and retries; you configure the sync, and Stacksync operates it.
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.
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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