PacerX: Race Predictor
Running Analysis & Trends
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Know what you could race today. New for iOS 27: smarter 5K-to-marathon predictions, Prediction History, and Deep Analysis powered by Apple Intelligence.
How fast could you race today?
PacerX turns the runs already in Apple Health into personalized 5K, 10K, half marathon, and marathon predictions—then shows you the training evidence behind every estimate.
Built for runners who want more than a workout list or a one-result pace calculator, PacerX looks across your recent training, best efforts, trends, pace, heart rate, effort, weather, elevation, and consistency to help you understand where your fitness is heading.
SMARTER RACE PREDICTIONS
See realistic estimates for 5K, 10K, Half Marathon, and Marathon based on your recent training. Open any prediction to understand the runs and signals that influenced it.
PREDICTION HISTORY
Track how your projected race fitness changes over time. See when your training is moving the needle—and when your estimates are holding steady.
DEEP ANALYSIS
On supported devices, Deep Analysis uses Apple Intelligence to give you a deeper explanation of what your recent training says about race readiness. PacerX uses on-device processing where appropriate and can use Apple Private Cloud Compute for supported Deep Analysis requests.
COMPARE YOUR RUNS
Open any run and compare it with a relevant past workout—or choose one yourself. Review pace and heart-rate charts, side-by-side metrics, and context such as route, distance, effort, weather, and elevation.
FIND YOUR BEST RUNS
Discover validated personal bests and standout efforts across your running history, including 1K, mile, 5K, 10K, half marathon, marathon, longest run, most climbing, most consistent splits, and more.
SEE THE FULL PICTURE
Review weekly mileage, monthly and yearly trends, pace, heart rate, cadence, elevation, perceived effort, shoes, running surface, weather, and other context from your training history.
PRIVATE BY DESIGN
PacerX reads your running data from Apple Health. No account is required, there are no ads, and your running history isn't used to build advertising profiles. Optional Deep Analysis may securely process derived training insights using Apple Private Cloud Compute, where request data is not stored.
PacerX doesn't replace your coach or training plan. It gives you a clearer picture of what your training says—so your next conversation, workout, or race decision starts with better context.
Understand your training. See what you're ready for. Keep moving forward.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
PacerX 1.3 is updated for iOS 27 and puts smarter race predictions at the center of your training picture.
• Smarter Race Predictions — Get personalized 5K, 10K, Half Marathon, and Marathon estimates built from your recent training—not just one race result or a simple pace formula.
• Prediction History — See how your projected race fitness changes over time.
• Deep Analysis — Use Apple Intelligence to get a deeper explanation of what your training says about race readiness.
• More polish — Faster history, better refresh behavior, clearer workout evidence, and reliability improvements throughout the app.
The developer, Nathan Stryker, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Nathan Stryker
- Size
- 12.5 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- PacerX Lifetime $79.99
- PacerX Annual Subscription $29.99
- Monthly Subscription $4.99
- Copyright
- © Nathan Stryker
