Left On Read 

The traditional Read Receipt will let you know at what time a person you have texted has viewed the message you sent them.  Left On Read alters this framework by giving you constant feedback as to how long it has been since your text has been sent.  Left On Read

is an audio application that tells you how long it has been since i’ve sent a text message with no reply.

Every 30 seconds it will alert you to how long you have been waiting for someone. The app will continually update you on the timer until the other person responds, weather it be 60 seconds or 60 hours later.