Log in to App Store Connect and press App Analytics or you may go directly to this link after logging in.
From the Overview page, your app will be displayed.
Look for Total Downloads to see the number of times your app has been downloaded that month. Other information on your apps performance will also be available here.
1. Log in to your Google Play console account by going to this link.
2. Select your app in the list and press Statistics, data on your app's performance will be available here.