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.

Developer certification

Kickstart your journey as a Klaviyo developer with the Klaviyo developer certificate. Learn the fundamentals of building with Klaviyo:

• Understand Klaviyo's data model
• Understand our APIs
• Get access to key resources and developer tools
• Explore use cases and examples of building with both server-side and client-side APIs
• Learn how to troubleshoot and handle errors

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.

1. Create a test account (optional)
2. Generate sample data
3. Install a library (optional)
4. Obtain API credentials
5. Authenticate
6. Make a test API request
7. 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.