When you search the Swift Package Index, the order in which… — The Swift Package Index Blog

When you search the Swift Package Index, the order in which the search results are displayed is determined by a combination of the relevance of text in the package name and description, and an internal score based on various metrics. Today, we’re adding a feature to make those scores public and transparent.
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https://swiftpackageindex.com/blog/revealing-and-explaining-package-scores