Delta might be a bit more popular than Fresh Web Explorer. We know about 1 link to it since March 2021 and only 1 link to Fresh Web Explorer. 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.
But it appears to have been disabled now. In the thread you shared, meghan (who appears to be part of the Moz team) linked this as the answer. Source: over 2 years 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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