Fit Companion might be a bit more popular than SyncMyTracks. We know about 1 link to it since March 2021 and only 1 link to SyncMyTracks. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
If you are on android I have succesfully used SyncMyTracks: https://syncmytracks.com/ to import my historical activity form google fit / suunto into Garmin Connect. It does include Samsung Health as an account it will sync. Allows syncing both ways, and you can have it automated (can't remember which features require purchase - but its not expensive and the automation works very well - never have to remember to... Source: over 2 years ago
I think you can plot the last 7 days for free and pay to graph longer time periods and add more fitness goals. Https://fitcompanion.stefanowatches.com/. Source: about 1 year ago
RunGap - Free Workout Data Manager for iOS.
Health Sync - Health Sync is a mobile application that synchronizes your health data from multiple fitness applications, including Strava, InBody, Samsung health, Fitbit, Polar, Suunto, Oura, and many more.
tapiriik - Automatically synchronize your fitness activities between Garmin Connect, Runkeeper, Strava and more.
FitToFit - FitToFit is a handy tool that enables you to export your health data from Fitbit to Google Fit.
FitnessSyncer - Make Sense of Your Health and Fitness Data
Sanitas HealthCoach - Sanitas HealthCoach is an interactive health coach that allows you to keep track of your daily activities and overview of your measurements.