The Amex Spend Manager is the old name for the American Express Business App. However, none of these mobile applications are available anymore. American Express has migrated the features from the American Express Business App to the main Amex Mobile App.
So, cardholders who would like to manage their business cards through an app can download the main Amex mobile app for iOS and Android devices. The American Express mobile app allows users to access their account and manage their cards in one place. They can freeze or unfreeze cards, pay their bills, monitor transactions, get real-time alerts, attach receipts, categorize transactions, and more.