Your app isn't really competing against other productivity apps, it's competing against the fact that an app is not going to be most people's best approach for improving their lives. The process of integrating a tool with life is not fun, it takes work and there's only so much that things like reminders can do for you.
I use two productivity apps on my phone. Reminders and the one I'm building. It's an ongoing experiment in how one can use software to improve life. Right now the only thing I've managed to integrate is spending tracking, and even that took months of back and forth consideration. Do I want to tag individual expenditures? How do I want to categorize them? How do I want to add an expenditure to a category? What should I call the act of spending something and what should I call the category? How do I want my reports to look like? Do I want reports in the database, or should they be generated dynamically? How should I represent common transactions that I do every day in a way that doesn't clutter up the main interface?
The whole exercise has left me unenthused about productivity software as a viable product category. Adding an expenditure now is easy as pie, for me, and only me. All of the work I had to do to figure out how I spend money and how I should build an app to manage it essentially has to be redone for every single person who wants to use software to help them manage their life. The domain seems simple, but it's actually incredibly complicated, because it's different for everyone.