This plugin is one of the best WooCommerce product addons plugins available. It is equipped with a customs form builder that allows you to add multiple extra options for your products. It also enables conditional logic and you can show/hide fields depending on the customization selected by the customer. You can also show/hide fields depending on the variation selected. You can also assign prices and use a custom pricing formula for product quantity, input value, and other attributes.
It has multiple display options available, such as checkbox, radio group, file upload, selection, input field, date, color, location, and price. Custom Product Addons has 4 pricing plans available depending on the number of sites and updates period, such as Single site (1-year update) for $39 and Single Site (lifetime updates) for $59.