10月16日在美國Apple App Store排名第一的免費應用程式？

This market will resolve according to the iOS app, ranked #1 in the United States on the iPhone Apple App Store's overall Top Charts under "Free Apps", as of 12:00 PM ET on the specified date. If the chart is unavailable at 12:00 PM ET, this market may remain open for up to 48 hours to allow for the data to become available. If the data remains unavailable, this market will resolve according to the last published ranking. To find the overall chart, click "Apps" at the bottom of the US iOS App Store app, scroll down to "Top Free Apps" and click "See All". Then under "Free Apps" in the "Top Charts" section, you'll see the list that will be used as the resolution source to this market (https://apps.apple.com/us/charts/iphone).