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CRM ⇄ Business productivity

Attio to Customer.io integration — real-time, two-way sync

Keep Attio and Customer.io 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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Why teams connect Attio and Customer.io

Sync what happens in Customer.io with the customer records in Attio, 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 Events, Segments, Campaigns, Broadcasts in Customer.io to Deals, Workspaces, Custom objects, People in Attio with bi-directional, real-time sync. Activity and record changes in Customer.io update the matching contact or account in Attio, and CRM data flows the other way wherever Customer.io can store and use it.

Common use cases

  • Sync product usage and billing attributes from Postgres onto Customer.io people so lifecycle campaigns trigger on real product behavior.
  • Push CRM segments and lead status into Customer.io so messaging respects sales stage.
  • Keep Attio aligned with a billing system or ERP on customer records and plan status.
  • Mirror lists and list entries into a database for pipeline reporting beyond the in-app views.

Where Customer.io handles support or shared inboxes

Tickets and conversations attach to the right contact and account in Attio, so sales sees open issues before the next call.

Where Customer.io runs outreach

Prospects, sends, and replies sync into Attio, keeping lead status current without manual imports.

Where Customer.io supplies contact or company data

Enriched fields land directly on records in Attio, and refreshes keep them from going stale.

What you can sync between Attio and Customer.io

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.

Attio objects Customer.io objects
Users Synced with incremental and full sync per the Stacksync docs. People Profiles with attributes, matched on identifiers like id or email; the main write target of data syncs.
Deals Pipeline records; read out for revenue reporting and written to from automation. Objects Non-person entities such as accounts or companies, related to people for account-level messaging.
Workspaces Synced with incremental and full sync per the Stacksync docs. Events Behavioral events sent via the Track API that trigger campaigns.
Custom objects Workspace-defined objects that behave like standard ones in the API. Segments Attribute- or event-based groups; data syncs feed the attributes segments evaluate.
People Standard person object; synced with marketing tools and warehouse person tables. Campaigns Automated workflows whose membership and metrics can be read via the App API.
Companies Standard company object; matched to billing and product accounts in two-way syncs. Broadcasts One-off sends to segments or audiences, triggerable via API.
What ships with Attio ⇄ Customer.io

Connect Attio and Customer.io for flexible, real-time data sync.

Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Attio–Customer.io connection.

Real-time

Two-way sync

Changes in Attio or Customer.io instantly reflect in both systems. No stale data, no manual imports.

No-code + pro-code

Workflow automation

Trigger automated workflows whenever Attio or Customer.io 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 Attio or Customer.io record.

Observability

Monitoring

Track your Attio ⇄ Customer.io sync health, view errors, and replay failed events in one click.

Trading partners

EDI

Transform legacy EDI complexity into simple database interactions between Attio and Customer.io.

How the Attio and Customer.io connectors work

Attio

Integration surface
REST API
Authentication
Guided in-app connection ("Attio CRM" connection created in a few clicks, "without any coding required"); the docs do not name the underlying auth mechanism (OAuth vs API key)
Change detection
Webhooks on record and list-entry events, with polling as a fallback
Capabilities
read · write · webhooks
Rate limits
Subject to the platform's published API rate limits.
Attio setup guide

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
How it works

How to connect Attio to Customer.io — 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.

  1. 01

    Connect your apps

    Authenticate Attio and Customer.io with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.

    • OAuth 2.0
    • SSH tunnel
    • VPC peering
    Attio connected
    Customer.io connected
    OAuth 2.0
    SSH tunnel
    SSL certificate
    VPC peering
  2. 02

    Choose tables

    Pick the Attio and Customer.io 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.

    • Standard objects
    • Custom objects
    • Auto-schema
    objects · Attio ⇄ Customer.io
    Customers 12,480
    Sales Orders 8,213
    Invoices 5,902
    Items 1,344
  3. 03

    Map fields

    Fields map automatically even when names and types differ. Stacksync handles transformation and type casting for you, zero configuration required.

    • Auto-map
    • Type casting
    • Transforms
    Attio Customer.io
    Company company_name text
    Email email text
    Amount amount numeric
    Created created_at timestamp
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FAQ

Attio and Customer.io integration FAQ

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.

Learn more about security
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:

OAuth 2 SSH Tunnelling SSL certificates IP Whitelisting VPN gateway VPC peering and more

Related integrations

Every pair below is a real-time, two-way sync. Search all 386 integrations available for Attio and Customer.io.

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