Fitness Bands

AI-built from peer-reviewed research, manufacturer specifications, FDA filings, and aggregated user reports. No first-person testing.

Review7 min read

Whoop 5.0: Sleep Tracking Data and Specifications

Whoop 5.0 review built from Whoop's published product information. No Whoop 5.0 specific PSG validation has been published yet. The predecessor Whoop 4.0 was validated by Miller et al. (2020) at 64% PSG agreement.

1 product compared

Review6 min read

Xiaomi Smart Band 9: Sleep Tracking Data and Specifications

Xiaomi Smart Band 9 review built from Xiaomi's published specifications. Budget AMOLED fitness band, 15.8g, 21-day battery, sleep stages tracking, 5 ATM water resistance.

1 product compared

Review6 min read

Fitbit Inspire 3: Sleep Tracking Data and Specifications

Fitbit Inspire 3 review built from Google Store / Fitbit published specifications. Budget Fitbit band, 20g, 10-day battery, color AMOLED, SpO2, sleep stages.

1 product compared

Review6 min read

Bellabeat Ivy: Sleep Tracking Data and Specifications

Bellabeat Ivy review built from Bellabeat published product information. Women's wellness bracelet, screen-free, 8-day battery, menstrual cycle correlation focus.

1 product compared

Top Picks6 min read

Best Budget Sleep Trackers Under $150: Data Over Marketing

Budget sleep trackers under $160 compared on published validation data, specs, and value. Best options based on peer-reviewed research where available.

5 products compared

Review7 min read

Fitbit Charge 6: Sleep Tracking Data and Specifications

Fitbit Charge 6 sleep tracking review. Haghayegh (2019) meta-analysis shows 81-91% sleep/wake accuracy. Charge 5 kappa 0.41 (Schyvens 2025). $160, free sleep staging.

1 product compared

Review7 min read

Whoop 4.0: Sleep Tracking Data and Specifications

Whoop 4.0 sleep tracking review based on Miller et al. (2020) showing 64% PSG agreement. Subscription-only model ($149-359/year). Full specs and cost analysis.

1 product compared