The Economics of Free Burgers: How Chains Battle for Digital Loyalty Today

2026-05-28 companies

New York, Thursday, 28 May 2026.
Competing for a slice of a $115 billion market, major fast-food chains are using today’s National Hamburger Day discounts to strategically boost digital app engagement and customer loyalty.

App-Gated Offers and Basket Building

The underlying economics of today’s promotions rely heavily on minimum purchase thresholds, ensuring that promotional items still generate positive margin or offset the baseline food cost. Shake Shack (SHAK) is executing this by offering a complimentary ShackBurger only when customers spend a minimum of $10 and use the promo code “FREEBURGER” through their app, website, or in-store kiosks [1][3][5][8]. Similarly, Sonic Drive-In is giving away a free Sonic Smasher or All-American Smasher to app users who make a qualifying purchase [alert! ‘Sources conflict on the minimum purchase amount for Sonic; some report a $3 minimum while others state a $5 minimum’] [1][3][5][8]. This overarching strategy forces basket-building to protect bottom-line profitability while driving app adoption [GPT].

For chains not strictly tying deals to app downloads, aggressive price slashing serves as a traditional, yet highly effective, foot-traffic driver. Smashburger is leaning into the date itself, pricing any single burger at $5.28 today when customers use the code “528SINGLE” [1][5][6][8]. Jack in the Box and Jack’s family of restaurants are deploying a volume-based strategy, selling hamburgers for just $1 after 2:00 p.m., with a limit of five per order [3][5][6][8]. Meanwhile, Carl’s Jr. and Hardee’s are drawing attention with an eye-catching buy-one-get-one Famous Star burger for merely one cent [1]. Even Buffalo Wild Wings is cutting prices by 50% on burgers, provided the order is placed through their “GO” takeout or delivery platform with a specific promo code [5].

Sources

Marketing strategy Fast food