Gravitus is a gym workout tracker for people who lift. Log sets in seconds on iPhone, Android, or Apple Watch, then see where every lift ranks against strength standards measured from 10M+ real workouts by 300,000+ lifters. Estimated 1RM trends, PR detection, plate math, muscle analysis, programs, an AI coach, and a Strength Score that places every lift on that distribution. 4.8 stars on the App Store. Running since 2015.