Canary echo is a companion app + service to https://canarytokens.org/. The service in conjunction with the mobile apps allows you to receive push notifications to your mobile phone when ever a canary token is triggered.
Record the canary echo url (it is displayed above the register button).
Click the register device button.
If the deviceid is already registered you will need to enter the corresponding password to use it. Alternatively if it is not registered, an account will automatically be created for you.
You can now add the echo url as a callback URL in the webhook url field when creating a canary token.
Whenever a canary token is triggered you will recieve a notification on your mobile device.
As with anything new, there are probably bugs or oversights from my side. Feel free to send these to me either via twitter (@rc1140) or by creating tickets on the respective github repos.