When a product is out of stock, Joinery Back-in-Stock Alerts adds a short form under it: “Out of stock. Want an email when it’s back?” For variable products, customers choose which out-of-stock option they want.
Joinery Back-in-Stock Alerts doesn’t contact any external service and doesn’t track you or your customers. It stores the email address, the product and when someone asked, sends one email, and deletes the request 30 days after sending it. Every email has a link to delete the request. It works with WordPress’s personal data export and erasure tools and suggests text for your privacy policy. To limit requests, it keeps a hash of the visitor’s IP address for an hour; the address itself is never stored.