1. Find my iPhone - A little phone button on the swipe up screen offers a loud signal to find my phone when I set it down somewhere and I cannot remember where. This feature alone saves me hours (and being late) wandering the house trying to find my phone. While simple, the feature alleviates a lot of stress for the absentminded professor (me).
2. Heart rate monitor - Two words: Thyroid issues. The heart rate monitor identifies high and low rates, even when sleeping. When the heart rate averages start to climb or drop over time I know it is a signal for a thyroid check. Oh, and it is good for exercise.
3. Sleep monitor - I became hooked to monitoring my sleep with my Fitbit. The iWatch brought this to a new level. Being a researcher, I love graphs of all kinds. The sleep tracking option helped me come to terms with my insomnia and accept it as normal for me.
4. Standland - I sit, a lot. Between counseling, writing, and teaching online I am always at my desk. I even own a standing desk, which would work better if I remembered to use it. This app reminds me to stand at 50 minutes to the hour between whatever times I choose. An added benefit is the reward of earning features within the game encouraging my agreement to stand.