Athalyze is an analytics-first training platform built for multi-device athletes. If you record the same workout on multiple devices (Apple Watch, Garmin watch or bike computer, Whoop, Oura), Athalyze combines those recordings into one clean activity. It selects the most reliable data for each metric and preserves the originals so you can compare inputs and trust the result. Multi-Device Merging β’ Automatically combine multi-device recordings into a single, clean activity β’ Choose the best data per metric for more accurate stats β’ Compare metrics across devices on one chart, with multiple inputs shown together for each metric β’ Import FIT files with advanced metrics, including Garmin FIT developer fields β’ See device source changes within a single recording when available, such as heart rate switching between Apple Watch and AirPods Pro Personal records β’ See your best efforts across a wide range of standard distances, from short intervals to marathon and ultra distances β’ Track best power efforts across sprint to endurance durations, from seconds to one hour β’ Filter by activity type, time period, and other criteria to zoom in on meaningful PRs Curves β’ Visualize your best effort as a curve on a chart β’ Compare curves across different time periods to see how your fitness is changing Histograms and trends β’ Use histogram views to see how your training distribution changes over time for pace, power, stride length, and other metrics Gear β’ Track shoes, bikes, and other gear, and see which workouts used each item β’ Monitor total mileage so you know when it is time to replace or service gear Devices β’ See every device you have ever used and all activities that device has been part of β’ View device history, including battery level trends when available Challenges β’ Create and join step challenges that accept step data from multiple devices so friends and family can compete together β’ Keep accurate step totals even if you swap devices, such as a Garmin watch in the morning, Apple Watch in the evening, and iPhone when you are not wearing a watch β’ Get push notifications when your place in a challenge changes Built for athletes who want a training log that is accurate, complete, and easy to trust. Terms of service & privacy policy: https://www.athalyze.com/terms https://www.athalyze.com/privacy