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CRM ⇄ Business productivity

Kustomer to Lemlist integration — real-time, two-way sync

Keep Kustomer and Lemlist 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 Kustomer and Lemlist

Sync what happens in Lemlist with the customer records in Kustomer, 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 Lemlist 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, Leads, Activities, Unsubscribes in Lemlist to Teams, Tags, Notes, Customers in Kustomer with bi-directional, real-time sync. Activity and record changes in Lemlist update the matching contact or account in Kustomer, and CRM data flows the other way wherever Lemlist can store and use it.

Common use cases

  • Stop or pause sequences automatically when a reply converts to a deal in the CRM
  • Mirror campaign performance data into BI tools for outbound reporting across senders
  • Push order and shipment records from commerce systems into Kustomer custom objects so agents answer order-status questions without switching tools
  • Mirror conversations and satisfaction data into a warehouse for support analytics and agent performance reporting

Where Lemlist runs outreach

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

Where Lemlist supplies contact or company data

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

Where Lemlist can store CRM context: fields kept current

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

What you can sync between Kustomer and Lemlist

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 Lemlist objects
Teams Team assignments support routing parity and reporting. Unsubscribes Opt-out records propagate to other outreach tools and the CRM for compliance.
Tags Labels on conversations and customers sync for categorization and analytics. Webhooks Hook subscriptions define which activity events are pushed to external endpoints.
Notes Internal annotations carry context alongside synced conversations. Team Members Sender and seat records map outreach activity to reps in other systems.
Customers The central record whose timeline aggregates every interaction; external attributes sync onto it. Campaigns Outreach campaigns are the container leads are pushed into from CRMs and list-building workflows.
Conversations Support threads across channels sync outward for analytics and CRM context. Leads Per-campaign prospect records sync in from enrichment sources and back out with status.
Messages Individual messages within conversations support full-thread replication. Activities Engagement records such as opens, clicks, replies, and bounces sync to CRM timelines.
What ships with Kustomer ⇄ Lemlist

Connect Kustomer and Lemlist for flexible, real-time data sync.

Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Kustomer–Lemlist connection.

Real-time

Two-way sync

Changes in Kustomer or Lemlist instantly reflect in both systems. No stale data, no manual imports.

No-code + pro-code

Workflow automation

Trigger automated workflows whenever Kustomer or Lemlist 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 Kustomer or Lemlist record.

Observability

Monitoring

Track your Kustomer ⇄ Lemlist sync health, view errors, and replay failed events in one click.

Trading partners

EDI

Transform legacy EDI complexity into simple database interactions between Kustomer and Lemlist.

How the Kustomer and Lemlist connectors work

Kustomer

Integration surface
REST API
Authentication
API key used as a bearer token, scoped by role
Change detection
Outbound webhooks on record events, plus polling for backfill
Capabilities
read · write · webhooks
Rate limits
Subject to the platform's API rate limits

Lemlist

Integration surface
REST API
Authentication
API key
Change detection
Webhooks on outreach activity events, plus polling
Capabilities
read · write · webhooks
Rate limits
Subject to the platform's API rate limits
How it works

How to connect Kustomer to Lemlist — 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 Kustomer and Lemlist 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
    Kustomer connected
    Lemlist connected
    OAuth 2.0
    SSH tunnel
    SSL certificate
    VPC peering
  2. 02

    Choose tables

    Pick the Kustomer and Lemlist 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 · Kustomer ⇄ Lemlist
    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
    Kustomer Lemlist
    Company company_name text
    Email email text
    Amount amount numeric
    Created created_at timestamp
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FAQ

Kustomer and Lemlist 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 Kustomer and Lemlist.

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