Amazon is offering the Spire Stone Stress Management and Activity Tracker for $103.96 right now. This usually costs $130, and it works with both iOS and Android.
This little stone has a respiration sensor to measure your breathing patterns. If your breathing becomes tense or erratic, a gentle notification helps you remember to relax, and gives you actionable ways to do so. Visual exercises, guided meditations, and more will help you stay calm.
You can also track activity levels, steps, calories burned, and more. The Spire Stone will help you learn where and when these moods hit, too, so you can be better prepared. It's washer-resistant, charges wirelessly, and lasts up to 10 days before needing to be recharged, meaning it won't add something meddlesome to your daily routine.