The first differentiator will be price: I would like to figure out a way to offer this to patients without charging for the app or turning the patients into a product.  As a tool to help people help themselves, I would like to lower barriers to entry as much as possible; which is why I&#x27;m exploring the possibility of pursuing this idea as a non-profit.  Other apps that I have found are either paid apps or free with in-app purchases (e.g. in-app purchase to keep your mood log private; I wonder what privacy is like in an app whose default state is public posting).<p>There are many more mood trackers than apps that allow you to track one dimension such as mood and not both symptoms and potential contributing factors, but as you point out there are some apps doing this already. Existing apps that track both symptoms and mood have two challenges:<p>1. Staying motivated to continue to log data daily as a patient goes through an evaluation is difficult if record keeping is done with pencil+paper or an app.<p>2. Apps that track more than mood have a more complicated UX to handle input across a variety of dimensions.<p>Apps like mySymptoms do make self-evaluation and data collection easier because the patient will usually have their phone with them; but this is still a chore.  mySymptoms was designed to track symptoms for Irritable Bowel Syndrome and the UX reflects the motivation level of that user group.<p>Instead of a log keeping app, I want to make an app that will act like a personal lab assistant guiding the patient through their study of 1. Here is how I am trying to make this process of record keeping easier:[EDIT: fixed line breaks]<p>1. A UI&#x2F;UX that allows data entry with as few touches as possible: each datapoint should be able to be entered with a single touch or gesture (voice interaction would be useful too, but one step at a time).<p>2. Present the user with one question from the lab assistant at a time instead of providing a daily grid to update.<p>3. Don&#x27;t wait for user action, but prompt the user to interact with the app. Timing of prompts can be triggered by learned timing of user interaction with the app, desired medication&#x2F;eating schedule, and sensor input to ask questions at the right time (some users my respond to prompts better while on the move while others when at home).