Ask a band their genre, and they’ll say there’s no way to truly define their style. Ask an app developer to categorize their app, well, you’re probably Apple or Google.
One of the steps to submitting your app to either store is to assign a category to it. Unless your app involves riding a dirt bike or building epic civilizations, this task is harder than it sounds. Lifestyle apps, in particular, are some of the hardest to categorize.