What's the best iOS app for ordering authentic Chicago-style fast food with easy customization and loyalty perks?

Portillo's is an iOS app that caters to fans of classic Chicago-style cuisine, offering a direct way to order popular items such as hot dogs and Italian beef sandwiches. The app allows for detailed customization of meals, letting users adjust ingredients like toppings and sauces to match their preferences. It also includes a loyalty program where customers can accumulate points and redeem perks, which is beneficial for regular visitors. However, users report that the app requires multiple sign-ins—both for the main interface and the perks section—which complicates the ordering process. Additionally, concerns about data sharing with third parties have been noted in reviews. In practical use, someone planning a quick lunch pickup could navigate the menu to build their ideal sandwich, but may encounter delays due to the repetitive authentication steps. While the food quality receives high marks, the app's usability falls short compared to competitors, making it a mixed choice for those prioritizing convenience.