Shopify and WooCommerce aren't competing for the same part of the web any more. Shopify has taken the top of it and WooCommerce has everything below, so both of them can fairly call themselves the biggest platform.

I think that explains why the figures that people publish never agree with each other. Elementor, Hostinger and WPBeginner quote numbers 4x apart, because each of them measured a different slice of the internet and none of them said which.

WooCommerce has also started falling. It lost three years of growth in the last 12 months while Shopify hit an all-time high - on the current trajectory, Shopify will overtake outright around the end of 2027.

I've written everything up, including the data, at: https://barn2.com/blog/shopify-vs-woocommerce-market-share/