I wore 4 CGMs at once to compare them
I wore 2 Stelos and 2 Lingos simultaneously for this experiment (using 2 iPhones) Because of sensors and cloud service issues, I was only able to get ~1 week of overlap between all 4 sensors.
At some points, the glucose values between CGMs were 77 mg/dL apart!
But if you ignore the differences in absolute values, the shape of the trends and spikes are pretty similar. My takeaway is that we should not be paying attention to how much time we are in the healthy 140-70 range (because sometimes a sensor said I was high while the 3 other sensors said I was in range), but rather look at how many steep spikes we have.
I also have finger stick, Oura ring sleep data, activity and food logs, which I plan to overlay on this graph.
I plan to make the data and python code (JupyterLab notebook) available if anyone is interested in doing more analysis or checking my work.