Real-time
Two-way sync
Changes in Close or Kustomer instantly reflect in both systems. No stale data, no manual imports.
CRM
Close to Kustomer integration — real-time, two-way sync
Keep Close 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
Case study
Migrated from MuleSoft
Case study
Migrated from Celigo
Migrated from Heroku Connect
Migrated from Matillion
Case study
Migrated from Fivetran
Case study
Migrated from Celigo
Why teams connect Close and Kustomer
Run Close 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 Smart Views, Leads, Contacts, Opportunities in Close with Companies, Custom Objects (Klasses), Users, Teams 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 Keep Close contacts aligned with a marketing automation platform so outreach lists stay current.
- 02 Push call, SMS, and email activity data into a warehouse for rep performance and outreach-cadence analysis.
- 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
Divisional or regional split
Where each CRM serves a different team or region, sync just the shared accounts and contacts so handoffs and cross-sell work.
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.
What you can sync between Close 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.
| Close objects | Kustomer objects | How this pairing syncs | |
|---|---|---|---|
| Users Sales reps referenced as owners on leads, opportunities, and activities. | Users Agent records map conversation ownership to people in other systems. | Same entity on both sides — records pair one-to-one and field-level changes reconcile in both directions. | |
| Smart Views Saved lead searches that can scope which records a segment-based sync pulls. | Notes Internal annotations carry context alongside synced conversations. | Smart Views is specific to Close and Notes to Kustomer — each maps to any object or custom field on the other side. | |
| Leads The top-level record in Close; represents a company and holds its contacts, opportunities, and activity history. | Customers The central record whose timeline aggregates every interaction; external attributes sync onto it. | Leads is specific to Close and Customers to Kustomer — each maps to any object or custom field on the other side. | |
| Contacts People nested under a lead, with emails and phone numbers used for outreach syncs. | Conversations Support threads across channels sync outward for analytics and CRM context. | Contacts is specific to Close and Conversations to Kustomer — each maps to any object or custom field on the other side. | |
| Opportunities Deal records with value, confidence, and status; commonly synced to reporting and billing systems. | Messages Individual messages within conversations support full-thread replication. | Opportunities is specific to Close and Messages to Kustomer — each maps to any object or custom field on the other side. | |
| Activities Calls, emails, SMS, notes, and meetings logged against a lead; the source for engagement analytics. | Companies Organization records group customers and map to CRM accounts. | Activities is specific to Close and Companies to Kustomer — each maps to any object or custom field on the other side. |
How changes propagate between Close 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.
Close Kustomer Sub-second propagation
DetectionClose notifies Stacksync of record changes through webhook events. Webhook subscriptions for record events, with polling on date_updated fields for backfills.
DeliveryEach detected change is written to Kustomer through its API, with automatic retries and rate-limit backoff.
Kustomer Close 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 Close through its API, with automatic retries and rate-limit backoff.
Rate-limit considerations
- Close: Subject to per-endpoint rate limits communicated in response headers.
- Kustomer: Subject to the platform's API rate limits.
What ships with Close ⇄ Kustomer
Connect Close and Kustomer for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Close–Kustomer connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Close 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 Close or Kustomer record.
Observability
Monitoring
Track your Close ⇄ Kustomer sync health, view errors, and replay failed events in one click.
Trading partners
EDI
Transform legacy EDI complexity into simple database interactions between Close and Kustomer.
How the Close and Kustomer connectors work
Close
- Integration surface
- REST API
- Authentication
- API key (sent via HTTP Basic auth)
- Change detection
- Webhook subscriptions for record events, with polling on date_updated fields for backfills
- Capabilities
- read · write · webhooks
- Rate limits
- Subject to per-endpoint rate limits communicated in response headers
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 Close 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 Close 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.
Close
connected
Kustomer
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Close 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 · Close ⇄ 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.
Close KustomerCompany company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Close and Kustomer integration FAQ
-
Yes. Stacksync provides a managed, real-time two-way integration between Close and Kustomer: authenticate both systems, choose the objects to sync (such as Close's Users and Smart Views), map fields visually, and changes propagate both ways in milliseconds — no code required.
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Close: REST API. Authentication: API key (sent via HTTP Basic auth). 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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Close: Webhook subscriptions can be created via the API to receive create, update, and delete events on leads, contacts, opportunities, and activities. 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 Close 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 Close 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 Close and Kustomer connectors, real-time two-way sync, monitoring, and support. That replaces building and maintaining a custom Close–Kustomer integration in-house.
-
Yes — Stacksync ships production-grade connectors for both Close 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
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
Every pair below is a real-time, two-way sync. Search all 441 integrations available for Close and Kustomer.
Popular · 7 of 441
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Close ⇄ Insightly -
Close ⇄ Intercom -
Close ⇄ Kommo -
Close ⇄ Nimble -
Kustomer ⇄ Freshworks CRM -
Kustomer ⇄ Gorgias -
Kustomer ⇄ Infor CRM
No integrations match .
