Real-time
Two-way sync
Changes in Klaviyo or SendGrid instantly reflect in both systems. No stale data, no manual imports.
Business productivity
Klaviyo to SendGrid integration — real-time, two-way sync
Keep Klaviyo and SendGrid 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 SendGrid
Stop re-entering the same information in Klaviyo and SendGrid: 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 Events, Metrics, Campaigns, Flows in Klaviyo with Categories, Senders, Single Sends, Unsubscribe Groups in SendGrid 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
- Push offline, ERP, or subscription order events into Klaviyo as metrics to trigger post-purchase and win-back flows
- Mirror campaign and flow engagement events into a warehouse for revenue attribution alongside order data
- Keep product-usage attributes from an operational database updated on SendGrid contacts to drive lifecycle segments
- Reconcile transactional email activity with support tickets so agents see what a customer was sent
Where SendGrid is where the team documents or plans: keep its data fed
Information that originates in Klaviyo stays current in SendGrid instead of going stale after a one-time paste.
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.
What you can sync between Klaviyo and SendGrid
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 | SendGrid objects | |
|---|---|---|
| Lists Static audience memberships sync in from CRMs and forms for targeting. | Segments Query-based contact groups whose membership SendGrid computes from contact fields. | |
| Segments Dynamic audiences are readable so other tools can mirror who qualifies. | Categories Synced with incremental and full sync per the Stacksync docs. | |
| Events Timestamped behavioral records tied to metrics; external order and product events are pushed in to trigger flows. | Senders Synced with incremental and full sync per the Stacksync docs. | |
| Metrics Event type definitions organize the activity stream used in segmentation and attribution. | Single Sends One-off marketing campaigns whose stats are read back for reporting. | |
| Campaigns Email and SMS sends expose performance data for warehouse-based reporting. | Unsubscribe Groups Synced with incremental and full sync per the Stacksync docs. | |
| Flows Automation definitions and their engagement data sync outward for attribution. | Email Activity Synced with incremental and full sync per the Stacksync docs. |
What ships with Klaviyo ⇄ SendGrid
Connect Klaviyo and SendGrid for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Klaviyo–SendGrid connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Klaviyo or SendGrid 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 SendGrid record.
Observability
Monitoring
Track your Klaviyo ⇄ SendGrid 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 SendGrid.
How the Klaviyo and SendGrid 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
SendGrid
- Integration surface
- REST API (v3)
- Authentication
- API key (create in SendGrid Settings > API Keys with Custom Access / Full Access for the objects to sync; key begins with "SG")
- Change detection
- Event Webhook posts delivery and engagement events (processed, delivered, open, click, bounce, spam report) to an HTTP endpoint; contact and list changes are detected by polling
- Capabilities
- read · write · webhooks
- Rate limits
- Subject to the platform's API rate limits; contact upserts are batched, asynchronous jobs rather than per-row writes
How it works
How to connect Klaviyo to SendGrid — 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 SendGrid 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
SendGrid
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Klaviyo and SendGrid 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 ⇄ SendGridCustomers 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 SendGridCompany company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Klaviyo and SendGrid integration FAQ
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Yes. Stacksync provides a managed, real-time two-way integration between Klaviyo and SendGrid: authenticate both systems, choose the objects to sync (such as Klaviyo's Lists and Segments), map fields visually, and changes propagate both ways in milliseconds — no code required.
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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 SendGrid 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 SendGrid connectors, real-time two-way sync, monitoring, and support. That replaces building and maintaining a custom Klaviyo–SendGrid integration in-house.
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Yes — Stacksync ships production-grade connectors for both Klaviyo and SendGrid. 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 SendGrid: Event Webhook posts delivery and engagement events (processed, delivered, open, click, bounce, spam report) to an HTTP endpoint; contact and list changes are detected by polling. Each detected change propagates to the other side in milliseconds, with field-level conflict resolution and an inspectable event log.
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On the Klaviyo side: Events, Metrics, Campaigns, Flows, plus custom fields where Klaviyo exposes them. On the SendGrid side: Categories, Senders, Single Sends, Unsubscribe Groups. Stacksync auto-detects both schemas and converts types between the two systems.
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 SendGrid.
Popular · 8 of 386
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Klaviyo ⇄ Campfire -
Klaviyo ⇄ Front -
Klaviyo ⇄ Amazon Seller Central -
Klaviyo ⇄ Twilio -
SendGrid ⇄ Zendesk - SendGrid ⇄ Campfire
- SendGrid ⇄ Front
- SendGrid ⇄ Amazon Seller Central
No integrations match .
