We don't have an app but you can easily view your Mailtrack email activity and settings on your phone by doing as follows:
1) Open Chrome on your phone, then go to https://mailtrack.io/
2) Sign in to your Mailtrack dashboard using the email address you use with Mailtrack.
If you open the Chrome menu then select the option 'Add to Home screen'...
...this will create a button on your phone's home screen, providing you with easy access to your Mailtrack account.