I love the fact that I can track my habits but my progress on anything not just numerical data, but what did I also, like what I used wash my face, oil cleans vs. cleansing milk, vs steaming vs. regular soap. The fact you can look by month or by chart allows for great was to view progress. The fact the line/bar/icon charts are stack make it easy to compare charts to see correlations.
Weaknesses of app
So what are the down sides it still a little glitchy on icons, if you have to correct your icon it may not always take. You also cannot predetermine how many icons you want which is a big flaw, if you ask me, for an app that is supposed to be fully customizable. Instead you are force to chose from their pre defined list, which means that If you need use specifically 7, 8, 9, 10, or 11 icons you cannot (but you cans use 12, highest amount of icons given). You cannot store icons that you made in the icon library but more of an inconvenience than a flaw.
Bonuses this app DOESNT have but would be great:
1 More graph colours (for bars and lines).
2. A pie chart option so you can see overal scope different icons in a week month or year for item or overall items (of similar data) per category.
3. Library to store your own icons
4. Line listing for notes, great that you can see what days you wrote notes but a list with a title or first line of each note would make it easier to find certain incidences or key notes. Right now you get an icon.
5. Being able to see several icons in day on calendar per category. That would be another way to connect allergies, sensitivities or other triggers to days a person has minor/major reactions.