Canton, Mass.-based Dunkin’ Brands will celebrate National Coffee Day, which is Sunday, Sept. 29, by treating fans to a free small cup of Dunkin’ Donuts hot or iced coffee via a mobile offer eligible at participating Dunkin’ Donuts restaurants throughout the United States.

The offer is available and redeemable only on Sept. 29 through the “My Offers” tab of the Dunkin’ App. The Dunkin’ App is available for free from the Apple App Store on iPhone or iPod touch or at www.itunes.com/appstore and from the Google Play Store at https://play.google.com/store.

Also in celebration of National Coffee Day, the company will sell its packaged coffee at a discounted price. For two days only — Sept. 28 and 29 — Dunkin' Donuts' 16-ounce packaged coffee will be available for $5.99 at participating Dunkin’ Donuts restaurants nationwide and online while supplies last, with a limit of two per guest, the company says.

Also on Sept. 28 and 29, consumers can purchase Dunkin’ Donuts K-Cup packs at a special price of $7.99 for a 14-count box. Like its packaged coffee, this offer is available at participating Dunkin’ Donuts restaurants nationwide while supplies last, with a limit of two per guest.

“As the nation's coffee leader, National Coffee Day is one of our favorite days of the year and a wonderful opportunity for us to recognize the important role our coffee plays in keeping millions of our guests running all day, every day,” said John Costello, Dunkin’ Brands president of global marketing and innovation, in a statement. “We are very much looking forward to celebrating this holiday by thanking our loyal guests through our mobile offer for a free cup of our famous coffee, special discounts on our packaged coffee and K-Cup packs, and other exciting National Coffee Day programs still to come.”