Does Seokai work with all Shopify themes and plans?

Seokai works with the data your store already has, so it isn't tied to any one theme. Free theme, premium theme, fully custom build, it doesn't matter. The metadata Seokai writes lives in the standard Shopify fields on your products, collections, pages, and articles.

It also works the same across Shopify plans. And since Seokai never touches your theme code, you can switch or update themes down the road without losing the SEO work you've done.