This is the biggest difference between the two apps — and it's the same gap Hevy shares with Strong.
Hevy shows you total volume lifted, a progress graph over time, and your estimated 1RM per exercise. It's the standard analytics package you'll find in most workout loggers. Useful for seeing whether your bench is trending up. Not useful for knowing whether your side delts got enough volume this week.
Duro tracks your weekly working sets per muscle group and plots them against volume landmarks (MV, MEV, MAV, MRV). Color-coded bars show which muscles are in the growth zone, which are maintaining, and which are approaching overtraining. You also get a full-body recovery map and PR tracking at every rep range — not just estimated 1RM.
Bottom line: Hevy's analytics tell you what happened. Duro's analytics tell you whether what happened was enough for growth. If you train for hypertrophy and want per-muscle-group feedback, Hevy can't give it to you.