Runner's Tools vs Splitr

Features: - Race Predictor: Will predict your potential on the most common race distances based on a given one. The automatic calculation uses a dynamic scale but we also made it possible to use your own (single Riegel factor) value. The default gives a realistic prediction, not assuming everyone is a trained high mileage athlete! - Training paces: Based on a (planned or recent) race performance, will calculate both the appropriate splits and paces for interval and tempo training - Track splits: Using GPS for track training is not great. This tool will convert a given pace to the target split of a full lap for each lane of a standard (IAAF) 400m track - Race Splits: Plan any race by breaking the distance and target race time down by kilometer or mile markers - Evaluate or plan a race by factoring in elevation, elevation gain/loss, temperature and humidity (dew point) - Convert any pace from minutes per mile to minutes per km and vice versa - Calculate the right speeds to set treadmills to, based on pace - Calculate age graded performance Works in both metric and imperial system.

Splitr is a smart pace calculator for runners, cyclists, and anyone who thinks in splits. Enter any two values — speed, pace, distance, or time — and Splitr instantly calculates everything else. No tapping a button. No switching screens. Just the numbers you need, the moment you need them. **How it works** Type a distance and a time, and Splitr shows you your pace and speed. Type a pace and a distance, and it tells you your finish time. Change any field and everything updates live. **What you can calculate** - Speed in mph and km/h - Pace per mile and pace per kilometre - Distance in miles and kilometres - Total time in hours, minutes, and seconds **Distance shortcuts** Tap 800m, 1.5K, 3K, 5K, 10K, Half Marathon, or Marathon to instantly set the distance — then just enter a pace or time to get everything else. **Built for clarity** A clean, dark interface keeps the focus on your numbers. Fields you've entered are highlighted in blue. Derived values are calculated automatically and shown in a distinct style so you always know what you typed vs. what was worked out. **Save your presets** Save any calculation with a custom name. Restore it with one tap. Reorder and rename your presets whenever you like. Your presets sync automatically across your devices via iCloud. **Home screen widget** Add the Splitr widget to your home screen to see your most recently saved preset at a glance — speed, pace, distance, and time — without opening the app. **Share results** Share any calculation via text, email, or any app on your phone. **100% free. Privacy-respecting.** Splitr is free and always will be. No subscription. No sign-up. No ads. No personal data collected — just anonymous, non-identifying usage diagnostics. Your presets sync across your devices via your own iCloud — we never see them. Network activity is limited to that iCloud sync, Apple's StoreKit for the optional tip jar, and the anonymous diagnostics. Every feature is free, no strings attached. Whether you're planning a marathon, checking your tempo pace, or converting a training plan from miles to kilometres, Splitr gives you the answer before you've finished typing.