Can I use the OrCam Read without the app?

Absolutely!

The app is a “companion app” that can help the user operate their device, and provides an easy way to customize  the device settings and access video tutorials.

It also has a “Find” button that causes the device to beep to help find it if it is lost. 

However, it isn’t essential for the device to be used with the app. Your device is easy to use, even without the app.