Delta might be a bit more popular than Runtastic. We know about 1 link to it since March 2021 and only 1 link to Runtastic. 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.
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: over 1 year ago
The one with getdelta.io is different, it returned HTTP 404, which "indicates that the origin server did not find a current representation for the target resource or is not willing to disclose that one exists.". Source: about 1 year ago
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