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I've been frustrated with available self-tracking tools. (Food trackers are slooooow and interface poorly with exercise trackers; I have never yet found a mood tracker that allows you to look at statistics; various other things like that.)
Are the features you want basically simple? Do you have a specific list of features in mind that you want and that other products don't offer, or are you just vaguely dissatisfied with current products?
In my mind a mood tracker app is just a frontend for a simple database table, but am I missing something? Do you have a theory of why the other products didn't get it right?