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CRM ⇄ Business productivity

Apollo.io to Lemlist integration — real-time, two-way sync

Keep Apollo.io 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 Apollo.io and Lemlist

Sync what happens in Lemlist 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 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 Activities, Unsubscribes, Webhooks, Team Members in Lemlist to Sequences, Deals (Opportunities), Tasks and calls, Custom fields in Apollo.io with bi-directional, real-time sync. Activity and record changes in Lemlist update the matching contact or account in Apollo.io, and CRM data flows the other way wherever Lemlist can store and use it.

Common use cases

  • Mirror campaign performance data into BI tools for outbound reporting across senders
  • Sync replies, opens, and bounces from Lemlist into the CRM so outbound activity shows on lead and contact records
  • Deduplicate contacts across Apollo and the CRM by syncing on email as the match key.
  • Push CRM opportunity stages back into Apollo so reps see pipeline context while sequencing.

Where Lemlist runs outreach

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

Where Lemlist supplies contact or company data

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

Where Lemlist can store CRM context: fields kept current

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

What you can sync between Apollo.io 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.

Apollo.io objects Lemlist objects
Contacts People saved to your Apollo account, synced with emails, phone numbers, and enrichment fields. Unsubscribes Opt-out records propagate to other outreach tools and the CRM for compliance.
Accounts Company records with firmographic attributes, matched to CRM accounts during sync. Webhooks Hook subscriptions define which activity events are pushed to external endpoints.
People (database records) Prospects from Apollo's global database, pulled into downstream systems once enriched or saved. Team Members Sender and seat records map outreach activity to reps in other systems.
Sequences Outreach cadences (emailer campaigns in the API); enrollment status is read to track which contacts are being worked. Campaigns Outreach campaigns are the container leads are pushed into from CRMs and list-building workflows.
Deals (Opportunities) Pipeline records that can be read and written to keep Apollo aligned with the CRM of record. Leads Per-campaign prospect records sync in from enrichment sources and back out with status.
Tasks and calls Rep activity records synced for activity reporting and coaching workflows. Activities Engagement records such as opens, clicks, replies, and bounces sync to CRM timelines.
What ships with Apollo.io ⇄ Lemlist

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

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

Real-time

Two-way sync

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

No-code + pro-code

Workflow automation

Trigger automated workflows whenever Apollo.io 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 Apollo.io or Lemlist record.

Observability

Monitoring

Track your Apollo.io ⇄ Lemlist 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 Lemlist.

How the Apollo.io and Lemlist 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

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 Apollo.io 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 Apollo.io 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
    Apollo.io connected
    Lemlist connected
    OAuth 2.0
    SSH tunnel
    SSL certificate
    VPC peering
  2. 02

    Choose tables

    Pick the Apollo.io 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 · Apollo.io ⇄ 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
    Apollo.io Lemlist
    Company company_name text
    Email email text
    Amount amount numeric
    Created created_at timestamp
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FAQ

Apollo.io 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 Apollo.io and Lemlist.

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