[Solved] Looking for a privacy oriented fitness tracker

Hi other privacy people :)

I am currently looking for a fitness tracker that at least doesn't need a proprietary app to get the data out of it. Haven't really found any recent articles that look into that aspect of fitness trackers, any advice?

I know about the bangle.js but wanted to know if there is more. Also, if you have this device and use it to track your running, I would be happy to read your review!

Thanks in advance!

Edit: Solution for me was to adjust the settings of opentracks. Before it recorded only every 10 metres. Additionally I ordered a chest strap for my heart rate. Brand is Polar, they seem to be good about not needing their own app to get your data.