Real-time
Two-way sync
Changes in Klaviyo or Slack instantly reflect in both systems. No stale data, no manual imports.
Business productivity
Klaviyo to Slack integration — real-time, two-way sync
Keep Klaviyo and Slack 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 Klaviyo and Slack
Stop re-entering the same information in Klaviyo and Slack: Stacksync keeps the records they share consistent in real time, in both directions.
Two tools in the daily stack often hold overlapping information: the same people, the same companies, or the same pieces of work, described twice. The tools do different jobs, so consolidating is not the answer; the overlap just needs to stop drifting.
Stacksync syncs Lists, Segments, Events, Metrics in Klaviyo with Channels, Messages, Threads, Users in Slack in real time. You choose which records overlap, map the fields that should match, and pick a direction or let changes flow both ways. From then on, an update made in either tool is reflected in the other within seconds, without exports or copy-paste.
Because the sync is field-level, each tool keeps its own extras; only the shared data is held in agreement.
Common use cases
- Sync customer profiles between Klaviyo and the CRM or warehouse so segments can use fields beyond storefront data
- Push offline, ERP, or subscription order events into Klaviyo as metrics to trigger post-purchase and win-back flows
- Archive channel messages into a warehouse or database for compliance and analytics
- Create or update records in a database when specific messages or reactions occur in a channel
Handoffs between teams
When work started in one tool continues in the other, the shared fields travel with it automatically.
Where both tools track people or companies: one consistent record
Contact and company details corrected in either tool update the other, so nobody works from the old version.
Where one tool produces events: mirror them in the other
Payments, replies, messages, or tickets created in one tool can create or update matching records in the other, keeping context in one place.
What you can sync between Klaviyo and Slack
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.
| Klaviyo objects | Slack objects | |
|---|---|---|
| Campaigns Email and SMS sends expose performance data for warehouse-based reporting. | Channels Conversations (public, private, DMs) that messages are read from and posted to. | |
| Flows Automation definitions and their engagement data sync outward for attribution. | Messages Keyed by channel and timestamp; posted via chat.postMessage and read via history methods. | |
| Templates Message templates are accessible via API for content management workflows. | Threads Replies grouped under a parent message timestamp, preserved when archiving conversations. | |
| Catalog Items Product catalog records synced from an ERP or PIM power product blocks and back-in-stock triggers. | Users Workspace members with profile fields, synced against HR systems and identity providers. | |
| Tags Organizational labels on campaigns, flows, and lists support reporting rollups. | User groups Handles like @support that map to teams in external systems. | |
| Profiles Person records with arbitrary custom properties are the target for CRM and warehouse-sourced attributes. | Files Uploads attached to messages, retrievable for archiving. |
What ships with Klaviyo ⇄ Slack
Connect Klaviyo and Slack for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Klaviyo–Slack connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Klaviyo or Slack 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 Klaviyo or Slack record.
Observability
Monitoring
Track your Klaviyo ⇄ Slack sync health, view errors, and replay failed events in one click.
Trading partners
EDI
Transform legacy EDI complexity into simple database interactions between Klaviyo and Slack.
How the Klaviyo and Slack connectors work
Klaviyo
- Integration surface
- REST API compliant with the JSON:API specification
- Authentication
- OAuth 2.0 for apps or private API keys
- Change detection
- Polling on updated timestamps; outbound webhooks exist for event topics (availability depends on plan or app-partner status) and as flow webhook actions
- Capabilities
- read · write · webhooks
- Rate limits
- Per-endpoint burst and steady rate limits apply
Slack
- Integration surface
- Web API (HTTP RPC-style methods) plus the Events API
- Authentication
- OAuth 2.0 with bot or user tokens and granular scopes
- Change detection
- Events API webhooks, delivered over HTTP callbacks or Socket Mode
- Capabilities
- read · write · webhooks
- Rate limits
- Per-method rate limit tiers; message posting is additionally limited per channel
How it works
How to connect Klaviyo to Slack — 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 Klaviyo and Slack with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.
Klaviyo
connected
Slack
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Klaviyo and Slack 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 · Klaviyo ⇄ SlackCustomers 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.
Klaviyo SlackCompany company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Klaviyo and Slack integration FAQ
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Yes. Stacksync provides a managed, real-time two-way integration between Klaviyo and Slack: authenticate both systems, choose the objects to sync (such as Klaviyo's Campaigns and Flows), map fields visually, and changes propagate both ways in milliseconds — no code required.
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Klaviyo: API versioning is handled with a date-based revision header, letting integrations pin behavior to a specific release. Slack: The Web API uses RPC-style method names such as chat.postMessage and conversations.history rather than resource URLs. Stacksync's field mapping accounts for these differences between Klaviyo and Slack without custom code.
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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 Klaviyo and Slack records are not retained after a sync operation.
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Stacksync pricing is usage-based and starts at $1,000/month, including the managed Klaviyo and Slack connectors, real-time two-way sync, monitoring, and support. That replaces building and maintaining a custom Klaviyo–Slack integration in-house.
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Yes — Stacksync ships production-grade connectors for both Klaviyo and Slack. The connectors handle authentication, schema detection, rate limits, and retries; you configure the sync, and Stacksync operates it.
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Change detection on Klaviyo: Polling on updated timestamps; outbound webhooks exist for event topics (availability depends on plan or app-partner status) and as flow webhook actions. On Slack: Events API webhooks, delivered over HTTP callbacks or Socket Mode. 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 Klaviyo and Slack.
Popular · 8 of 386
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Klaviyo ⇄ Lemlist -
Klaviyo ⇄ Lusha -
Klaviyo ⇄ Microsoft 365 -
Klaviyo ⇄ Microsoft Dynamics 365 - Slack ⇄ Lemlist
- Slack ⇄ Lusha
- Slack ⇄ Microsoft 365
- Slack ⇄ Microsoft Dynamics 365
No integrations match .
