[6] A majority of the approximately 143,000 [7] merchants who use Klaviyo's software are e-commerce sellers who host their offerings on Shopify.

[8] In August 2022, e-commerce company Shopify announced it was making Klaviyo the recommended email solution partner for its Shopify Plus merchant platform, with a US$100,000,000 strategic investment into the company.

[12] In April 2023, Klaviyo filed for an initial public offering (IPO) for a listing at the New York Stock Exchange.

[8][13] In September, the company went public, raising $576 million in the IPO at a $9.2 billion valuation.

[20] In addition to its e-commerce platform integrations, users can integrate other tools from their tech stacks like Zendesk, Postscript, Meta Ads, Google Ads, Square, Albato, Zapier, Aftership, Amazon Buy with Prime, Big Commerce, Canva, Zoho and Okendo [21] and Salesforce, directly to Klaviyo, or use an API solution when an integration needs to be customized.