Sales Motivator - Free Gifts allows you to create different gift offers. You can select products, collections, or vendors that will trigger a free product offer, or you can set a minimum cart value that will include a gift.
With the app, you can showcase your gift offers on product pages, in the cart, and in a side widget. You can include multiple offers: for example, a gift given for purchasing a certain product and another gift given for reaching a specified spending limit.
The Sales Motivator - Free Gifts app doesn’t have a free plan. The paid one starts from $29.99 per month if you are on a Shopify Basic plan.