We are not aware of any WooCommerce extensions that this plugin is not compatible with. If you find one that causes a problem, then please let us know. In particular, this plugin is compatible with WooCommerce Opening Hours (it displays the customer’s chosen delivery/collection time on its printouts), WooCommerce Invoices and Packing Slips by WP Overnight (options set in these plugins for your print-out layout will be honoured), WooCommerce Delivery Notes, WooCommerce Product Add-Ons from woocommerce.com (it displays the customer’s chosen choices in the print-out), and WooCommerce Currency Switcher by Aelia (the print-outs will use the proper currency symbols).