AP Shipping Rules Tester for WooCommerce is in the WordPress.org plugin directory. Version 1.2.8 is the release you install.
Open WooCommerce > Shipping Rules Tester after you activate it. The screen reads your shipping settings. It doesn’t change them, and it doesn’t save the sample you type in.
Give it a destination and a package. It shows the zone that matches, then the local rates WooCommerce calculates for built-in flat rate, free shipping, and local pickup. You can use a quick package, or build several items, including a saved product’s shipping class, weight, and dimensions.
Some methods stay marked as skipped. The tester doesn’t build a live cart, apply a coupon, sign in as a customer, or call an external shipping provider. Installed extensions can still run their own hooks during the calculation, so confirm a surprising result at checkout.
The side-by-side comparison stays in that browser tab. Leave the page, or choose Clear comparison, and it’s gone.
The directory listing has the readme. The shipping guide walks through zones, classes, and the sample package. The product page answers the usual install questions.