No, you cannot use an Alexa without the app. The Amazon Alexa app is essential to setting up and using your Echo device. Without the app, you won’t be able to access all of Alexa’s features and abilities or configure any settings on your device. You will also need the mobile app if you want to control multiple devices with a single account. To get started, download the Amazon Alexa app on iOS or Android devices and follow the instructions for setup. Once complete, you can use voice commands through your Echo device as well as manage settings in the mobile application such as connecting Wi-Fi networks or customizing skills and preferences for each user in your home. With this powerful combination of hardware and software working together, users can experience an intuitive way to interact with their homes like never before!