New York (CNN) Wednesday is National Cheeseburger Day, with some of the biggest chains offering some much-needed discounts amid consumer complaints about rising prices.McDonalds, the biggest company, is selling 50-cent double cheeseburgers when theyre ordered in its app about 45 cents more than what the chains original hamburger cost in 1948. Its part of companys string of deals to kickstart slumping sales, including recently extending its popular $5 value meal until December.Fast food has been a low-profit margin business with little customer loyalty. Chains have been unveiling big giveaways, typically tied to their mobile apps, to help drive business and develop more repeat customers.And McDonalds isnt the only burger chain to offer deals. Wendys is selling a junior bacon cheeseburger for just one cent through September 22, as long as you buy something else from the menu on its app. Also, Burger King is giving away a free cheeseburger as long as you buy something else that costs at least $1 through its app.Smaller chains are offering similar deals, too. Jack in the Box is tossing in a Jumbo Jack cheeseburger with a $1 purchase on its app, and the Carls Jr. app is offering a half-priced double cheeseburger. White Castle is offering a buy one, get one deal on its Cheese Sliders in the app with the code SAYCHEESE.Smashburger, which just unveiled a new logo and menu, is selling $5 cheeseburgers (which typically cost more than $7) with the code BURGERDAY on its app or in-store, as well as offering a vegetarian alternative. Plus, its giving a bounce-back coupon to anyone that orders the deal so customers can come back and get 50% off any burger or sandwich on a future visit.McDonalds pricey burgers have become a flashpoint of criticism and a symbol of elevated fast food prices. Joe Erlinger, president of McDonalds USA, wrote in an open letter posted to the companys website in May that the companys franchisees needed to avoid one-off price hikes that hurt the companys reputation. And he noted that prices havent risen nearly as much as people think.Still, customers have turned their backs on fast food companies, shifting to casual dining chains like Applebees and Chilis, which many customers believe offer more value.So deals are particularly crucial to fast food companies at the moment to lure customers back.The-CNN-Wire & 2024 Cable News Network, Inc., a Warner Bros. Discovery Company. All rights reserved._______Watch KOAA News5 on your time, anytime with our free streaming app available for your Roku, FireTV, AppleTV and Android TV. Just search KOAA News5, download and start watching.