Ask HN:What is a personal or biz web utility that is needed/not yet dominated?

I have spent the last year learning how to create a web application and now that I am capable, I am having difficulty finding a utility that would be worth the time investment to create it. All the obvious ones exist and are controlled by a major player and I have no means to compete with my part time involvement. I'm not looking for 'the next big thing' as much as a usefull utility that could development into a livable income's worth of paying customers. Note: I am talking about a web only application. I am unfamiliar with android/iphone.