The ultimate diary for your physical evolution. Precise weight tracking, intuitive habit logging, and elite performance analytics.

Real-time metabolic sync with all major wearables for precise calorie and heart-rate data.
Capture mood, sleep quality, and performance notes in a daily aesthetic log built for speed.
Advanced volume and weight metrics to ensure every session pushes you past your plateau.
Scale your results with tailored tracking precision.
Download ONYX on iOS and Android. Track every rep, every gram, every breakthrough — wherever you train.
ONYX athletes wear Hardcore. Built for those who refuse to quit.