Rename Buy now button for Free products

There is a filter for the add-to-cart text: ‘woocommerce_product_single_add_to_cart_text’. It has two parameters, the standard text and the product. So you would need to write something like this:

add_filter( 'woocommerce_product_single_add_to_cart_text', 'my_func', 10, 2 );
function my_func( $default_text, $product ) {
  $price = (float) $product->get_price();
  if( $price ) {
    return $default_text;
  } else {
    return 'FREE';
  }
}

Not tested, so I hope you will be able to debug it if necessary.

Hi,
We’ve not heard back from you in a while, so I’m marking this thread as resolved. Hopefully, the above code snippet by @lorro was helpful!

If you have further questions, please feel free to open a new topic.

Thanks.