PacerX vs Dromeas

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.

Dromeas is a simple, focused running calculator — everything you need to plan a run or check your numbers after one, with no ads, no account, and no tracking. CORE CALCULATOR Enter any two of pace, time, and distance to instantly get the third. Quick-select common race distances from 1K to Spartathlon, switch between km and mi with one tap, and scroll through wheel pickers built for speed. SPLITS See a full kilometer-by-kilometer or mile-by-mile split breakdown for any pace and distance, generated instantly. FAVORITES Save any pace/time/distance combination you use often — a goal race pace, a recovery run pace, whatever you come back to — and reload it in one tap. MORE TOOLS • Race Predictor — estimate your finish time at any distance from a recent race result, using the Riegel formula. • Training Paces — get Easy, Marathon, Threshold, Interval, and Repetition paces from your threshold pace. • VO2max Estimator — estimate your aerobic fitness from a recent race performance. • Heart Rate Zones — get your five training zones from your max or threshold heart rate. • Critical Speed — find your sustainable speed and D′ from two or more race results. • Grade-Adjusted Pace — see your flat-equivalent effort on a hilly route, using a real physiological model of the energy cost of climbing and descending (Minetti et al.). • Calories Burned — estimate energy expenditure from your weight, distance, and time, using the ACSM running equation. ON YOUR WRIST A full Apple Watch app: turn the Digital Crown to read one pace four ways at once, work out a pace from a distance and a time, and reach your Favorites straight from your wrist. A watch face complication keeps your last pace one tap away. MAKE IT YOURS Choose Light, Dark, or System appearance, and pick an accent color — Blue, Orange, Green, Yellow or Magenta. PRIVATE BY DESIGN Dromeas makes no network requests. There's no account, no analytics, and no ad tracking. Your Favorites and preferences stay on your device — the only place they ever travel is your own Apple Watch, over Apple's local connection, never to a server. Read the full privacy policy in the app or on our website. Whether you're pacing a workout, predicting a race time, or just doing quick running math, Dromeas gets you the number and gets out of your way.