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Business productivity ⇄ CRM

Klaviyo to Nutshell integration — real-time, two-way sync

Keep Klaviyo and Nutshell 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 Klaviyo and Nutshell

Sync what happens in Klaviyo with the customer records in Nutshell, 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 Klaviyo 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 Flows, Templates, Catalog Items, Tags in Klaviyo to Tasks, Notes, Products, Tags in Nutshell with bi-directional, real-time sync. Activity and record changes in Klaviyo update the matching contact or account in Nutshell, and CRM data flows the other way wherever Klaviyo can store and use it.

Common use cases

  • 01 Keep suppression and consent status consistent between Klaviyo and other email or SMS tools
  • 02 Sync catalog items from an ERP or PIM so product recommendations and back-in-stock flows use current data
  • 03 Mirror tasks and activities into ops tools for cross-team visibility.
  • 04 Sync Nutshell leads into a warehouse or Postgres so small B2B teams can report on pipeline without exports.

Common sync patterns

Where Klaviyo processes payments

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

Where Klaviyo can store CRM context: fields kept current

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

Where Klaviyo runs outreach

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

What you can sync between Klaviyo and Nutshell

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 Nutshell objects How this pairing syncs
Tags Organizational labels on campaigns, flows, and lists support reporting rollups. Tags Segmentation labels mapped to lists or filters in downstream tools Same entity on both sides — records pair one-to-one and field-level changes reconcile in both directions.
Lists Static audience memberships sync in from CRMs and forms for targeting. Notes Free-text history attached to leads and contacts, replicated for a full timeline Lists is specific to Klaviyo and Notes to Nutshell — each maps to any object or custom field on the other side.
Segments Dynamic audiences are readable so other tools can mirror who qualifies. Products Line items attached to leads, used to sync sold products into billing Segments is specific to Klaviyo and Products to Nutshell — each maps to any object or custom field on the other side.
Events Timestamped behavioral records tied to metrics; external order and product events are pushed in to trigger flows. Users Rep records used to resolve ownership when syncing assignments Events is specific to Klaviyo and Users to Nutshell — each maps to any object or custom field on the other side.
Metrics Event type definitions organize the activity stream used in segmentation and attribution. Leads Nutshell's deal object; synced as the pipeline record linked to people and companies Metrics is specific to Klaviyo and Leads to Nutshell — each maps to any object or custom field on the other side.
Campaigns Email and SMS sends expose performance data for warehouse-based reporting. People Individual contacts, kept consistent with marketing and outreach tools Campaigns is specific to Klaviyo and People to Nutshell — each maps to any object or custom field on the other side.

How changes propagate between Klaviyo and Nutshell

Each direction of the sync is driven by what the source system can signal and what the destination accepts — detection, delivery, and expected latency below.

Klaviyo Nutshell Sub-second propagation

DetectionKlaviyo notifies Stacksync of record changes through webhook events. Polling on updated timestamps.

DeliveryEach detected change is written to Nutshell through its API, with automatic retries and rate-limit backoff.

Nutshell Klaviyo Sub-second propagation

DetectionNutshell notifies Stacksync of record changes through webhook events. Webhook subscriptions for record events, with polling as fallback.

DeliveryEach detected change is written to Klaviyo through its API, with automatic retries and rate-limit backoff.

Rate-limit considerations

  • Klaviyo: Per-endpoint burst and steady rate limits apply.
  • Nutshell: Subject to the platform's API rate limits.
What ships with Klaviyo ⇄ Nutshell

Connect Klaviyo and Nutshell for flexible, real-time data sync.

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

Real-time

Two-way sync

Changes in Klaviyo or Nutshell instantly reflect in both systems. No stale data, no manual imports.

No-code + pro-code

Workflow automation

Trigger automated workflows whenever Klaviyo or Nutshell 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 Nutshell record.

Observability

Monitoring

Track your Klaviyo ⇄ Nutshell 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 Nutshell.

How the Klaviyo and Nutshell 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

Nutshell

Integration surface
JSON-RPC API over HTTPS; a newer REST API is also offered
Authentication
HTTP Basic with account email and API key
Change detection
webhook subscriptions for record events, with polling as fallback
Capabilities
read · write · webhooks
Rate limits
subject to the platform's API rate limits
How it works

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

    Choose tables

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

Klaviyo and Nutshell integration FAQ

SECURITY

Security teams trust 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
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 415 integrations available for Klaviyo and Nutshell.

Popular · 5 of 415
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