Nick Herbert from London, England created the ReplyASAP app to stop his teenage son from ignoring his messages. It works by taking over the phone screen of the person who has been messaged and then it sounds an alarm until the text is answered.
He said: "My son started at Langley Park School for Boys a couple of years ago and has a smartphone. I thought this would make getting hold of him easier, but it doesn't at all. In fact, he is always playing games and has the phone on silent. It drives me crazy.
"I'm hoping the app will make our relationship better. It will alleviate the stress when I can't get hold of him as I will know that he has seen my message ... As they are teenagers I realise they aren't going to be massively keen. My son hasn't really said anything negative about the app. It is all about him understanding why it's there.
"If I have something important to say I will send an urgent message. Hopefully It will make things a bit easier. Will it be the bane of his life? Maybe, I'm not going to be using it all the time to speak to him. It is supposed to be a failsafe."
The app currently only works on Android and costs 99p if you want to be able to message one person. It costs £2.49 to message four people, £6.99 for ten people and £12.99 for 20.
Mr Herbert is hoping to have the app available via the App Store soon so it can be used on iOS too.