Based on our record, pretix should be more popular than Runtastic. It has been mentiond 2 times since March 2021. 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.
What about something like Pretix. I personally haven't tried it. Source: almost 2 years ago
You may want to try pretix: https://pretix.eu/about/en/, the corresponding GitHub: https://github.com/pretix/pretix . Source: over 2 years ago
Workaround is to use SHealth only, export gpx file, then import it through runtastic.com (Profile (Arrow Next to profile picture) ->Settings->Activity Import). The imported workout count for the challenges. Source: almost 2 years ago
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