YITH WooCommerce Waiting List Premium

YITH WooCommerce Waiting List is a WooCommerce add-on that adds customers to a waiting list when a product is out of stock. They get an automatic email when it is back in stock.

It also works for pre-launch products. You can build a mailing list of interested customers before the sale starts, disable sales to build interest, and offer a custom discount or bonus to people who subscribe. The list gives you a base for targeted campaigns once the product is available.

You can also suggest similar products to customers waiting on an item that is unavailable.