Do you have an iPhone and like to download apps with promises of free food? You are in luck then.
Head over here to download the Shack App and enter promo code “shackappy” for a FREE single ShackBurger, up to $5.55 at participating Shake Shack locations.
The offer is valid until Tuesday, February 28, 2017 and is one-time use only for app users.
For more information or to receive a FREE ShackBurger at Shake Shack, please head here.