TaxJar might be a bit more popular than Delta. We know about 1 link to it since March 2021 and only 1 link to Delta. 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.
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
Might want to check out taxjar.com, I haven't used it but one thing they claim to do is help with this compliance. Source: almost 2 years ago
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