PacerX: Running Analysis

New in 1.1: compare similar runs side by side, uncover pace and heart rate differences, and see validated personal bests across your running history.

PacerX turns the runs already in Apple Health into useful comparisons, validated personal bests, and long-term performance trends. Compare similar workouts side by side, understand changes in pace, heart rate, effort, weather, and elevation, and see the records that genuinely hold up—without accounts, ads, or uploading your run history. Built for runners who want more than a workout list, PacerX helps you understand what changed, what stands out, and how each run fits into the larger picture. COMPARE YOUR RUNS Open any run and compare it with a relevant past workout—or choose any run yourself. PacerX can suggest matches based on route, distance, and effort and explain why each run was selected. Review overlaid pace and heart-rate charts, side-by-side metrics, and clear observations drawn directly from your run data. FIND YOUR BEST RUNS Discover standout performances across your complete running history, including your fastest 1K, mile, 5K, 10K, half marathon, and marathon. PacerX can also surface your longest run, most climbing, most consistent splits, and steadiest heart rate. Results are validated to help prevent GPS spikes, tracking gaps, paused stretches, and implausible pace data from creating false personal bests. SEE THE FULL PICTURE Review the training signals that matter, including: • Run history and workout summaries • Weekly mileage and monthly trends • Yearly progress and all-time distance • Pace, heart rate, cadence, and elevation • Perceived effort and workout type • Shoes, running surface, and other context • Weather and environmental conditions Numbers alone rarely tell the full story. A fast run after a stressful week, a high-heart-rate easy day, a long run on tired legs, or a workout that felt harder than expected all add important context. PacerX helps turn that context into a clearer picture of how your running is changing over time. BUILT TO SUPPORT BETTER CONVERSATIONS PacerX does not replace your coach, trainer, or training plan. It provides a detailed, organized training history that can help you and your coach spot overlooked patterns and have more informed conversations about your running. PRIVATE BY DESIGN PacerX is designed to provide useful running insights without accounts, advertising, social pressure, or unnecessary clutter. You remain in control of your data and how optional analytics are used. Review intelligently. Understand your running. Keep moving forward.