Period Calendar Period Tracker vs Plank Challenge: Core Workout

A data-backed head-to-head — estimated revenue, downloads, ratings and pricing side by side, from live App Store signals. Updated continuously.

Period Calendar Period TrackerPlank Challenge: Core Workout

Verdict: Period Calendar Period Tracker earns more — an estimated $620k–$3.4M/mo, versus $73k–$390k/mo for Plank Challenge: Core Workout.