It’s happened at least once (or once a day; or even once an hour) to parents of tweens or teens. You send a text your your child. The text remains unanswered. Countless texts later, you realise that your offspring is deliberately ignoring your messages or – worse – has put you on silent.

What can you do about it?

Well, if you are Nick Herbert from London, you develop an app to force children to answer their parents’ texts.

He hired a friend to help develop the app, which triggers an alarm that will sound until a text is read. It also freezes the phone until the child responds to the parents’ messages.

Ever since the app – called ReplyASAP – launched on Google Play, it has been downloaded more than 75,000 times. For now, is only available for Android users but Herbert is hoping to add an iPhone version soon.