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Hey! These docs are for version 1-2, which is no longer officially supported. Click here for the latest version, 2023-09-15!

Get started with Klaviyo

Get started with Klaviyo's APIs in a few easy steps. Log in, grab your API credentials, and start developing.

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.

  1. Create a sandbox 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 an overview of Klaviyo's data model and 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.