The designs of the two watches are very similar and they are the same size. The Fitbit Versa 3 looks and works very much like the more expensive Sense but lacks the ability to do an ECG or the stress analysis. There is a passive measurement that is automatically reported in the app as well as the ability to actively take a measurement which requires you placing your palm over the watch face for at least two minutes - a process that found to be a bit stressful. The Sense also measures stress, though I didn’t find the feature all that useful. Overnight Spo2 is often lower than during waking hours. Either way, it gives you a picture of your respiratory health. The advantage to the Fitbit’s overnight measurement is that it gives you data that you can’t easily get with a pulse oximeter that’s not designed to work while you sleep. I brought it with me to a doctor’s appointment and its measure was very close to what the nurse recorded on her device. I first considered that to be a limitation but - if you need to measure Spo2 on demand, you can easily do so with an inexpensive pulse oximeter like the $18 Zacurate 500BL Fingertip Pulse Oximeter Blood Oxygen Saturation Monitor, which is very easy to use and - as far as I can tell - accurate. It also measures your breathing rate and Spo2 while you sleep.Īs I mentioned, all of the watches I tested measure Spo2 but, while the Apple, Samsung and Amazafit measure it on demand, the Fitbit Sense only measures it while you sleep. The Fitbit Sense also tracks your skin temperature each night to show how it varies from your personal baseline though I’m having trouble figuring out how this correlates to general health and fitness. ECG Report from Fitbit Sense via Fitbit App Larry Magid

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