Two-way sync
Changes in Kustomer or Outreach instantly reflect in both systems. No stale data, no manual imports.
Keep Kustomer and Outreach in sync without custom scripts. Cut weeks of integration work, eliminate silent data drift, and give your team a single, reliable source of truth.
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 Custom Objects (Klasses), Users, Teams, Tags in Kustomer with Sequences, Sequence states, Mailings, Calls in Outreach 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.
Keep both CRMs accurate while the merged team decides on a target system, instead of freezing one and losing months of updates.
When one CRM is replacing the other, run both fully live until cutover, with no snapshot gap and no data freeze.
Where each CRM serves a different team or region, sync just the shared accounts and contacts so handoffs and cross-sell work.
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.
| Kustomer objects | Outreach objects | |
|---|---|---|
| Companies Organization records group customers and map to CRM accounts. | Mailboxes Connected sending accounts referenced when attributing outbound activity | |
| Custom Objects (Klasses) Structured external records such as orders and subscriptions synced in to appear on the customer timeline. | Prospects The people being engaged; the main record kept in sync with the CRM | |
| Users Agent records map conversation ownership to people in other systems. | Accounts Companies grouping prospects, aligned with CRM account ownership | |
| Teams Team assignments support routing parity and reporting. | Sequences Multi-step cadences; synced as reference data for enrollment automation | |
| Tags Labels on conversations and customers sync for categorization and analytics. | Sequence states Per-prospect enrollments; writing one adds a prospect to a cadence | |
| Notes Internal annotations carry context alongside synced conversations. | Mailings Sent emails with engagement data, pulled for activity analytics |
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Kustomer–Outreach connection.
Changes in Kustomer or Outreach instantly reflect in both systems. No stale data, no manual imports.
Trigger automated workflows whenever Kustomer or Outreach data changes, update records, fire webhooks, or kick off sequences without brittle API scripts.
Handle millions of events per minute without losing a single Kustomer or Outreach record.
Track your Kustomer ⇄ Outreach sync health, view errors, and replay failed events in one click.
Transform legacy EDI complexity into simple database interactions between Kustomer and Outreach.
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.
Authenticate Kustomer and Outreach with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.
Pick the Kustomer and Outreach 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.
Fields map automatically even when names and types differ. Stacksync handles transformation and type casting for you, zero configuration required.
Yes. Stacksync provides a managed, real-time two-way integration between Kustomer and Outreach: authenticate both systems, choose the objects to sync (such as Kustomer's Companies and Custom Objects (Klasses)), map fields visually, and changes propagate both ways in milliseconds — no code required.
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.
Common patterns for Kustomer and Outreach: Post-acquisition consolidation; Migration with a parallel run; Divisional or regional split. Keep both CRMs accurate while the merged team decides on a target system, instead of freezing one and losing months of updates.
Kustomer: REST API. Authentication: API key used as a bearer token, scoped by role. Outreach: REST API conforming to the JSON:API specification. Authentication: OAuth 2.0. Stacksync manages authentication, retries, and rate limits on both sides.
Kustomer: Custom object types are called Klasses, and they are the standard mechanism for landing external data like orders and subscriptions where agents work. Outreach: Webhook subscriptions can be registered per resource for create, update, and destroy events, enabling near-real-time outbound sync. Stacksync's field mapping accounts for these differences between Kustomer and Outreach without custom code.
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 Kustomer and Outreach records are not retained after a sync operation.
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.
Let your users access Stacksync from your centralized user management systems. Works with Okta, Azure, Google SSO and more.
Immediately get alerted about record syncing issues over email, Slack, PagerDuty and WhatsApp. Resolve issues from a centralized dashboard with retry and revert options.
Securely connects to your systems with:
Every pair below is a real-time, two-way sync. Search all 386 integrations available for Kustomer and Outreach.