HOUSTON (KTRK) --Shake Shack is celebrating a brand new app with free burgers.
The new app allows customers to order right from the app, then come in and pick up their food.
To redeem the offer, you download the Shake Shack app, create an account and use the promo "shackappy" at checkout.
The offer is redeemable until Feb. 28, 2017.
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