Real-time
Two-way sync
Changes in Firebase or Klaviyo instantly reflect in both systems. No stale data, no manual imports.
Database ⇄ Business productivity
Firebase to Klaviyo integration — real-time, two-way sync
Keep Firebase and Klaviyo 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
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Migrated from Matillion
Case study
Migrated from Fivetran
Case study
Migrated from Celigo
Why teams connect Firebase and Klaviyo
Mirror Klaviyo's data into Firebase so your own code can read and write it like any other table, with changes flowing both ways in seconds.
Engineers integrate with tools like Klaviyo through APIs, which means auth, pagination, rate limits, webhooks, and retry logic, all maintained forever and all different for every tool. Meanwhile the data would be trivial to use if it simply lived in Firebase.
Stacksync mirrors Flows, Templates, Catalog Items, Tags from Klaviyo into Authentication Users, Cloud Storage Objects, Cloud Functions Triggers, Firestore Collections in Firebase and keeps both sides in sync in real time. Your services query the database directly, and inserts or updates your code makes flow back into Klaviyo, so the tool and the database never disagree.
Common use cases
- Keep suppression and consent status consistent between Klaviyo and other email or SMS tools
- Sync catalog items from an ERP or PIM so product recommendations and back-in-stock flows use current data
- Mirror Firestore collections into Postgres or a warehouse to run SQL analytics on app data.
- Write CRM-side changes (plan, status, owner) back into Firestore documents the app reads.
Automate Klaviyo from your codebase
Write to the synced tables in Firebase and Stacksync propagates the change into Klaviyo, replacing custom integration code.
React to changes as they happen
Updates in Klaviyo arrive as row changes in Firebase, so triggers, jobs, and services can respond in near real time.
One integration pattern for the whole stack
Every synced tool looks the same from the database, so each new integration is configuration, not a new codebase.
What you can sync between Firebase and Klaviyo
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.
| Firebase objects | Klaviyo objects | |
|---|---|---|
| Authentication Users User accounts read into CRMs and warehouses for customer records. | Segments Dynamic audiences are readable so other tools can mirror who qualifies. | |
| Cloud Storage Objects Files referenced from documents; usually synced as metadata plus URLs. | Events Timestamped behavioral records tied to metrics; external order and product events are pushed in to trigger flows. | |
| Cloud Functions Triggers Server-side hooks that fire on document changes and can push updates outward. | Metrics Event type definitions organize the activity stream used in segmentation and attribution. | |
| Firestore Collections Top-level groupings of documents that a sync maps to tables or SaaS objects. | Campaigns Email and SMS sends expose performance data for warehouse-based reporting. | |
| Firestore Documents Schemaless JSON-like records, the primary unit synced to and from external systems. | Flows Automation definitions and their engagement data sync outward for attribution. | |
| Subcollections Nested collections under documents, typically flattened into related tables during sync. | Templates Message templates are accessible via API for content management workflows. |
What ships with Firebase ⇄ Klaviyo
Connect Firebase and Klaviyo for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Firebase–Klaviyo connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Firebase or Klaviyo 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 Firebase or Klaviyo record.
Observability
Monitoring
Track your Firebase ⇄ Klaviyo sync health, view errors, and replay failed events in one click.
Trading partners
EDI
Transform legacy EDI complexity into simple database interactions between Firebase and Klaviyo.
How the Firebase and Klaviyo connectors work
Firebase
- Integration surface
- REST and gRPC APIs, typically accessed through the Firebase Admin SDK
- Authentication
- Google service account credentials (IAM) for server-side access; Firebase Auth tokens for client contexts
- Change detection
- Real-time snapshot listeners on Firestore queries and Cloud Functions triggers on document changes
- Capabilities
- read · write
- Rate limits
- Subject to Firestore's documented operation quotas and per-document write throughput limits
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
How it works
How to connect Firebase to Klaviyo — 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 Firebase and Klaviyo with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.
Firebase
connected
Klaviyo
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Firebase and Klaviyo 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 · Firebase ⇄ KlaviyoCustomers 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.
Firebase KlaviyoCompany company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Firebase and Klaviyo integration FAQ
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Yes. Stacksync provides a managed, real-time two-way integration between Firebase and Klaviyo: authenticate both systems, choose the objects to sync (such as Firebase's Authentication Users and Cloud Storage Objects), map fields visually, and changes propagate both ways in milliseconds — no code required.
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Yes. Each object mapping can be bidirectional or restricted to a single direction (both systems accept writes). Read-only mirrors, one-way pushes, and full two-way sync can be mixed in the same integration.
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Common patterns for Firebase and Klaviyo: Automate Klaviyo from your codebase; React to changes as they happen; One integration pattern for the whole stack. Write to the synced tables in Firebase and Stacksync propagates the change into Klaviyo, replacing custom integration code.
-
Firebase: REST and gRPC APIs, typically accessed through the Firebase Admin SDK. Authentication: Google service account credentials (IAM) for server-side access; Firebase Auth tokens for client contexts. Klaviyo: REST API compliant with the JSON:API specification. Authentication: OAuth 2.0 for apps or private API keys. Stacksync manages authentication, retries, and rate limits on both sides.
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Klaviyo: API versioning is handled with a date-based revision header, letting integrations pin behavior to a specific release. Firebase: Firebase spans two databases with different models: Firestore (collections and documents) and the original Realtime Database (a single JSON tree). Stacksync's field mapping accounts for these differences between Firebase and Klaviyo 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 Firebase and Klaviyo records are not retained after a sync operation.
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 Firebase and Klaviyo.
Popular · 8 of 386
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Firebase ⇄ Orderful -
Firebase ⇄ Resend - Firebase ⇄ ServiceNow
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Firebase ⇄ Slack -
Klaviyo ⇄ Azure SQL Database -
Klaviyo ⇄ Citus -
Klaviyo ⇄ Couchbase -
Klaviyo ⇄ DuckDB
No integrations match .
