If you are still ordering fast food without checking the restaurant’s app first, you could be leaving money on the table. Major chains are increasingly putting discounts, rewards, and limited-time promotions inside their apps instead of advertising them on the regular menu. Some offers require a rewards account, while others are available only after you place an order through the app. The savings can range from discounted sides to free food with a qualifying purchase. Here are five offers worth checking before your next fast-food run.