Free ShackBurger at Shake Shack › Free Stuff ~Coupons Galore ~ Hot Deals › Freebies › Free ShackBurger at Shake ShackThis topic has 1 reply, 1 voice, and was last updated January 24, 2017 at 1:40 am by .Viewing 0 reply threadsAuthorPosts January 24, 2017 at 1:40 am #375946 FreebieQueenShake Shack is offering a free ShackBurger when you download their app.Good until 2/28/17 1. Download the Shake Shack iOS2. Register3. Add a single ShackBurger in your cart 4. Use coupon code SHACKAPPY at checkout to get it for free #Budget101 #FreebiesAuthorPostsViewing 0 reply threadsYou must be logged in to reply to this topic.Log In Username: Password: Keep me signed in Register Log In › Free Stuff ~Coupons Galore ~ Hot Deals › Freebies › Free ShackBurger at Shake Shack