Sleep Tracker
Effectiveness rated 70 due to moderate validation in 2 PSG studies (70-91% accuracy, kappa 0.42-0.55), suitable for consumer trends but limited stage precision vs clinical tools. Safety 90 reflects no major incidents, only anecdotal skin issues without trial data on long-term wear. Quality 85 for transparent hardware specs and FCC cert, lacking supplement-style purity testing. Overall 77 positions it as a solid consumer sleep tracker with evidence-based limitations.
Fitbit Sense 2 offers good consumer sleep tracking with 70-91% accuracy vs PSG in 2 validation studies, using multi-sensor data for stages and Sleep Score. Moderate stage detection limits clinical use, but reliable for trends. Minor skin risks; strong value at $200.