At present, many people are already using the Internet to access various websites. These websites provide relevant and irrelevant information. The access to any website is not directly prohibited. As such, access to websites with adult contents are made available even to children. The purpose of the study is to develop a monitoring system with built-in string analyzer that can be an efficient tool in minimizing the access to websites with adult content. The study also aims to determine how can a string analyzer application be utilized and implemented to minimize the access to these websites with Internet Explorer being the web browser. The string analyzer application was specifically used to check inputted words and match them with words associated to obscenity. The researchers followed the Experimental research method. In the development of the application, the researchers used the 4D methodology as guide. At the end of the study, the researchers were able to conclude that the application would work best with Internet Explorer. With such limitations, the researchers highly recommend that the application be made applicable to all browsers for optimal use.