Real-time
Two-way sync
Changes in Customer.io or Outreach instantly reflect in both systems. No stale data, no manual imports.
Business productivity ⇄ CRM
Customer.io to Outreach integration — real-time, two-way sync
Keep Customer.io 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.
- 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 Customer.io and Outreach
Sync what happens in Customer.io with the customer records in Outreach, 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 Campaigns, Broadcasts, Deliveries / Messages, Newsletters in Customer.io to Tasks, Opportunities, Users, Mailboxes in Outreach with bi-directional, real-time sync. Activity and record changes in Customer.io update the matching contact or account in Outreach, 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.
- Pull mailing, call, and task activity into a database for engagement analytics beyond native reports.
- Keep account ownership and stages aligned between Outreach and the CRM as territories change.
Where Customer.io processes payments
Charges, refunds, and subscription changes appear on the account in Outreach, so revenue context lives with the relationship.
Where Customer.io can store CRM context: fields kept current
Owner, lifecycle stage, or account details from Outreach 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 Outreach, so sales sees open issues before the next call.
What you can sync between Customer.io and Outreach
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 | Outreach objects | |
|---|---|---|
| Segments Attribute- or event-based groups; data syncs feed the attributes segments evaluate. | Mailboxes Connected sending accounts referenced when attributing outbound activity | |
| Campaigns Automated workflows whose membership and metrics can be read via the App API. | Prospects The people being engaged; the main record kept in sync with the CRM | |
| Broadcasts One-off sends to segments or audiences, triggerable via API. | Accounts Companies grouping prospects, aligned with CRM account ownership | |
| Deliveries / Messages Per-recipient message records whose lifecycle events flow out through reporting webhooks. | Sequences Multi-step cadences; synced as reference data for enrollment automation | |
| Newsletters Recurring email sends with performance metrics available for reporting syncs. | Sequence states Per-prospect enrollments; writing one adds a prospect to a cadence | |
| People Profiles with attributes, matched on identifiers like id or email; the main write target of data syncs. | Mailings Sent emails with engagement data, pulled for activity analytics |
What ships with Customer.io ⇄ Outreach
Connect Customer.io and Outreach for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Customer.io–Outreach connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Customer.io or Outreach 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 Outreach record.
Observability
Monitoring
Track your Customer.io ⇄ Outreach 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 Outreach.
How the Customer.io and Outreach 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
Outreach
- Integration surface
- REST API conforming to the JSON:API specification
- Authentication
- OAuth 2.0
- Change detection
- webhook subscriptions on resource create, update, and destroy events, plus polling
- Capabilities
- read · write · webhooks
- Rate limits
- subject to per-user hourly rate limits
How it works
How to connect Customer.io to Outreach — 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 Outreach 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
Outreach
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Customer.io 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.
objects · Customer.io ⇄ OutreachCustomers 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 OutreachCompany company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Customer.io and Outreach integration FAQ
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Yes. Stacksync provides a managed, real-time two-way integration between Customer.io and Outreach: authenticate both systems, choose the objects to sync (such as Customer.io's Segments and Campaigns), map fields visually, and changes propagate both ways in milliseconds — no code required.
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Customer.io: Beyond people, Customer.io supports non-person objects (for example accounts) with typed relationships to people, enabling account-based messaging logic. 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 Customer.io and Outreach 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 Customer.io and Outreach 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 Customer.io and Outreach connectors, real-time two-way sync, monitoring, and support. That replaces building and maintaining a custom Customer.io–Outreach integration in-house.
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Yes — Stacksync ships production-grade connectors for both Customer.io and Outreach. 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 Outreach: Webhook subscriptions on resource create, update, and destroy events, plus polling. Each detected change propagates to the other side in milliseconds, with field-level conflict resolution and an inspectable event log.
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
Every pair below is a real-time, two-way sync. Search all 386 integrations available for Customer.io and Outreach.
Popular · 8 of 386
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Customer.io ⇄ SAP Sales Cloud -
Customer.io ⇄ Streak CRM -
Customer.io ⇄ SugarCRM -
Customer.io ⇄ Twenty CRM -
Outreach ⇄ Google Sheets -
Outreach ⇄ Klaviyo -
Outreach ⇄ Lemlist -
Outreach ⇄ Lusha
No integrations match .
