Please upvote https://github.com/dart-lang/pub-dev/issues/2714 to get first-class support for download counts.
In the meantime, you can view a package's popularity score, which is a relative download count vs. other packages.
Docs: https://pub.dev/help/scoring
Popularity measures the number of apps that depend on a package over the past 60 days. We show this as a percentile from 100% (among the top 1% most used packages) to 0% (the least used package). We are investigating if we can provide absolute usage counts in a future version See this issue.
Although this score is based on actual download counts, it compensates for automated tools such as continuous builds that fetch the package on each change request.
Example: https://pub.dev/packages/const_date_time/score
