Real-time
Two-way sync
Changes in Apollo.io or Customer.io instantly reflect in both systems. No stale data, no manual imports.
CRM ⇄ Business productivity
Apollo.io to Customer.io integration — real-time, two-way sync
Keep Apollo.io 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
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 Apollo.io and Customer.io
Sync what happens in Customer.io with the customer records in Apollo.io, 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 Broadcasts, Deliveries / Messages, Newsletters, People in Customer.io to People (database records), Sequences, Deals (Opportunities), Tasks and calls in Apollo.io with bi-directional, real-time sync. Activity and record changes in Customer.io update the matching contact or account in Apollo.io, and CRM data flows the other way wherever Customer.io can store and use it.
Common use cases
- Keep unsubscribe and subscription-preference state consistent between Customer.io and the CRM to avoid compliance gaps.
- Sync account-level objects and their person relationships for B2B messaging keyed to company attributes.
- Land sequence enrollment status and outcomes in a warehouse for outbound performance reporting.
- Deduplicate contacts across Apollo and the CRM by syncing on email as the match key.
Where Customer.io supplies contact or company data
Enriched fields land directly on records in Apollo.io, and refreshes keep them from going stale.
Where Customer.io processes payments
Charges, refunds, and subscription changes appear on the account in Apollo.io, so revenue context lives with the relationship.
Where Customer.io can store CRM context: fields kept current
Owner, lifecycle stage, or account details from Apollo.io sync into Customer.io, so people working there have the context without switching tools.
What you can sync between Apollo.io 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.
| Apollo.io objects | Customer.io objects | |
|---|---|---|
| Contacts People saved to your Apollo account, synced with emails, phone numbers, and enrichment fields. | Deliveries / Messages Per-recipient message records whose lifecycle events flow out through reporting webhooks. | |
| Accounts Company records with firmographic attributes, matched to CRM accounts during sync. | Newsletters Recurring email sends with performance metrics available for reporting syncs. | |
| People (database records) Prospects from Apollo's global database, pulled into downstream systems once enriched or saved. | People Profiles with attributes, matched on identifiers like id or email; the main write target of data syncs. | |
| Sequences Outreach cadences (emailer campaigns in the API); enrollment status is read to track which contacts are being worked. | Objects Non-person entities such as accounts or companies, related to people for account-level messaging. | |
| Deals (Opportunities) Pipeline records that can be read and written to keep Apollo aligned with the CRM of record. | Events Behavioral events sent via the Track API that trigger campaigns. | |
| Tasks and calls Rep activity records synced for activity reporting and coaching workflows. | Segments Attribute- or event-based groups; data syncs feed the attributes segments evaluate. |
What ships with Apollo.io ⇄ Customer.io
Connect Apollo.io and Customer.io for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Apollo.io–Customer.io connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Apollo.io 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 Apollo.io or Customer.io record.
Observability
Monitoring
Track your Apollo.io ⇄ 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 Apollo.io and Customer.io.
How the Apollo.io and Customer.io connectors work
Apollo.io
- Integration surface
- REST API
- Authentication
- API key (passed in request headers); master keys unlock account-wide endpoints
- Change detection
- Polling on updated-at timestamps; webhook callbacks exist only for delivering asynchronous enrichment results, not as a general change-event stream
- Capabilities
- read · write
- Rate limits
- Rate limits and enrichment credits vary by plan; bulk endpoints are throttled separately from single-record calls
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 Apollo.io 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.
- 01
Connect your apps
Authenticate Apollo.io 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.
Apollo.io
connected
Customer.io
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Apollo.io 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.
objects · Apollo.io ⇄ Customer.ioCustomers 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.
Apollo.io Customer.ioCompany company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Apollo.io and Customer.io integration FAQ
-
Yes. Stacksync provides a managed, real-time two-way integration between Apollo.io and Customer.io: authenticate both systems, choose the objects to sync (such as Apollo.io's Contacts and Accounts), map fields visually, and changes propagate both ways in milliseconds — no code required.
-
Customer.io: Beyond people, Customer.io supports non-person objects (for example accounts) with typed relationships to people, enabling account-based messaging logic. Apollo.io: Apollo distinguishes between people in its global database and contacts saved to your account; only saved contacts carry your custom fields and sequence history. Stacksync's field mapping accounts for these differences between Apollo.io and Customer.io 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 Apollo.io and Customer.io records are not retained after a sync operation.
-
Stacksync pricing is usage-based and starts at $1,000/month, including the managed Apollo.io and Customer.io connectors, real-time two-way sync, monitoring, and support. That replaces building and maintaining a custom Apollo.io–Customer.io integration in-house.
-
Yes — Stacksync ships production-grade connectors for both Apollo.io and Customer.io. The connectors handle authentication, schema detection, rate limits, and retries; you configure the sync, and Stacksync operates it.
-
Change detection on Apollo.io: Polling on updated-at timestamps; webhook callbacks exist only for delivering asynchronous enrichment results, not as a general change-event stream. On Customer.io: Reporting webhooks push message and delivery events; person attribute changes are not streamed and require source-side detection. 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 Apollo.io and Customer.io.
Popular · 8 of 386
-
Apollo.io ⇄ Full Enrich -
Apollo.io ⇄ Google Sheets -
Apollo.io ⇄ Klaviyo -
Apollo.io ⇄ Lemlist -
Customer.io ⇄ HubSpot -
Customer.io ⇄ Microsoft Dynamics 365 Sales -
Customer.io ⇄ Attio -
Customer.io ⇄ Pipedrive
No integrations match .
