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Business productivity ⇄ CRM

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

Keep Customer.io and Freshsales 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 Customer.io and Freshsales

Sync what happens in Customer.io with the customer records in Freshsales, 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 Objects, Events, Segments, Campaigns in Customer.io to Products, Contacts, Accounts, Deals in Freshsales with bi-directional, real-time sync. Activity and record changes in Customer.io update the matching contact or account in Freshsales, 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.
  • Two-way sync of contacts and accounts between Freshsales and a Postgres database so product and data teams query CRM data with SQL.
  • Sync deals into a data warehouse for pipeline reporting alongside product usage data.

Where Customer.io supplies contact or company data

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

Where Customer.io processes payments

Charges, refunds, and subscription changes appear on the account in Freshsales, so revenue context lives with the relationship.

Where Customer.io can store CRM context: fields kept current

Owner, lifecycle stage, or account details from Freshsales sync into Customer.io, so people working there have the context without switching tools.

What you can sync between Customer.io and Freshsales

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 Freshsales objects
Segments Attribute- or event-based groups; data syncs feed the attributes segments evaluate. Accounts Company records kept aligned with billing, ERP, and warehouse tables.
Campaigns Automated workflows whose membership and metrics can be read via the App API. Deals Pipeline records synced to a warehouse for revenue reporting.
Broadcasts One-off sends to segments or audiences, triggerable via API. Tasks Rep to-dos created from external triggers or synced for productivity reporting.
Deliveries / Messages Per-recipient message records whose lifecycle events flow out through reporting webhooks. Appointments Scheduled meetings readable for activity analytics.
Newsletters Recurring email sends with performance metrics available for reporting syncs. Notes Free-text records attached to contacts, accounts, and deals.
People Profiles with attributes, matched on identifiers like id or email; the main write target of data syncs. Sales activities Configurable activity types logged against records, useful for engagement scoring.
What ships with Customer.io ⇄ Freshsales

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

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

Real-time

Two-way sync

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

No-code + pro-code

Workflow automation

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

Observability

Monitoring

Track your Customer.io ⇄ Freshsales 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 Freshsales.

How the Customer.io and Freshsales 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

Freshsales

Integration surface
REST API
Authentication
API key sent as a Token authorization header
Change detection
Polling with updated-at filters through views; outbound webhooks can be configured via workflow automations
Capabilities
read · write · webhooks
Rate limits
Subject to per-account API rate limits that vary by Freshworks plan
How it works

How to connect Customer.io to Freshsales — 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 Customer.io and Freshsales 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
    Customer.io connected
    Freshsales connected
    OAuth 2.0
    SSH tunnel
    SSL certificate
    VPC peering
  2. 02

    Choose tables

    Pick the Customer.io and Freshsales 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 · Customer.io ⇄ Freshsales
    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
    Customer.io Freshsales
    Company company_name text
    Email email text
    Amount amount numeric
    Created created_at timestamp
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FAQ

Customer.io and Freshsales 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 Customer.io and Freshsales.

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