Many gadgets can only measure your heart rate (average number of heartbeats per minute), but not your heart rate variability (time lapsed between heartbeats). Unfortunately, you can’t use such devices for measurements in Welltory. They are:
Withings
Other fitness trackers used for heart rate monitoring
Some gadgets do support heart rate variability measurements, but their developers’ policy doesn’t allow this data to be transferred to other apps. They include:
Biostrap
Oura
Garmin
Mi Band
Fitbit can only give us «summaries» — your average HRV data collected daily, not RR intervals with timestamps. Unfortunately, we can't build a decent HRV analysis based on that data.
See if your device is compatible with Welltory for HRV measurements and activity tracking.
However, there are gadgets we can get information from. For example, Apple Watch transfers data to Apple Health, which shares it with Welltory. We then analyze it and provide you with our interpretations. So, you can use Apple Watch for Welltory measurements. Also, you can use your Samsung Watch for measuring HRV and tracking activity.