Although I don't know if such an app exists but I think creating such an application would be possible.
The basic algorithm we could use is that notify a user with the transaction ID if an address boradcasts a transaction on the blockchain.
Again I don't know if implementing it would be possible. I am just expressing my thoughts on the application development.
Do you even mind reading comments before you give your opinion if something is possible etc. I've put down few applications that will let you see your balance and transactions and some of them have the option to notify you. Of course this is an "easy" work as all you have to do is grab the information, data, from an API that other people provide such as blockchain.info, etherscan.io etc. unless you host your own nodes and want to build an app that will connect to your nodes. Set that every now and then the app to refresh and issue an request from an API and if something is changed issue the notification.... You clearly never programmed, or understand the basics. Please read and inform yourself before just posting just to post something.