If you're considering purchasing an Amazon Echo device, you may be wondering if there is a monthly fee associated with the Alexa voice assistant. The good news is that there is no monthly fee for using Alexa. You will, however, need to pay for any subscription services that you use with Alexa (such as Amazon Music or Audible). In addition, if you purchase an Echo device with cellular connectivity, you'll need to pay for a data plan. So, while there is no monthly fee for using Alexa, there are some potential costs that you should be aware of before making your purchase.