p8b-infinitime VS ActivityLog2

I'm not aware of any major brands that offer account free service.

As far as I know, Tizen smart watches can function well on their own after setting up the account once and I believe cloud synchronization is optional. However, Tizen is a dead end with Samsung getting back to Android Wearable.

There's PineTime (https://www.pine64.org/pinetime/), which is very barebones but open source. Popular firmware, such as InfiniTime (https://github.com/InfiniTimeOrg/InfiniTime) can also be flashed onto several smart watches available on your favourite Chinese import stores (for example: https://github.com/StarGate01/p8b-infinitime for the Colmi P8).

I use ActivityLog2 which also reads FIT files.

https://github.com/alex-hhh/ActivityLog2/releases

Don’t believe me? Check out the interactive gui stuff at https://alex-hhh.github.io

Check out this guy's page I just came across here. He's got a bunch of gui based Racket applications that look really cool.

I use and like Activity Log 2 - https://github.com/alex-hhh/ActivityLog2. You can import most common file formats like TCX, GPX and FIT.

This https://github.com/alex-hhh/ActivityLog2 works quite well for FIT files on desktop.

If you just want to track your workout data, there are far better softwares/websites to do it, I mean strict data analysis. As you don't give something to social part, could be great. GoldenCheetah , Github-ActivityLog2, TrainingPeaks:WKO5, Runalyze

As suggested I can record my activities from my watch/bikecomputer, and sync later, there are some apps who is kinda nice: GoldenCheetah, Runalyze, TrainingPeaks/WKO, Github: ActivityLog2, but I have not found a own-private-local cloud solution... OsmAnd+ and LocusMap are doing a good recording job as well, have not check if those recorded track/activity can be shared/transfered easily on a owncloud.