Tatome is only activated when headphones are plugged in by default. The volume of the ringtone can be changed.
Tatome is free without any advertising. But you can buy a premium in app product which enables some more options like:
Use the text to speech without a attached headphone. Modify the spoken text by yourself.
21.08.2013 - Version 1.2
In-app bill changes
14.08.2013 - Version 1.1
Small gui fixes
13.08.2013 - Version 1.0