Get started with Klaviyo

What is Klaviyo?

Klaviyo is a powerful email and SMS marketing tool with a strong commitment to data science. Our integrations library and API make it simple to build emails and experiences that are truly personal at scale.

Ready to get started?

Welcome to the Developer guides! Follow along the steps below, or select a step to begin, and get started building with Klaviyo today.

Create a test account (optional)
Generate sample data
Install a library (optional)
Obtain API credentials
Authenticate
Make a test API request
Rate limits & error handling

Then, level up your knowledge with in-depth code guides:

Understanding Client-Side API Calls
Understanding Customer Data

Learn Klaviyo fundamentals with an overview of Klaviyo's data model and architecture:

Klaviyo's data model
Klaviyo's architecture

Not a developer?

Head on over to the Help Center to browse a comprehensive collection of how-to's and guides for using Klaviyo products and getting connected to our native integrations.