Hacker News Reader

Easy, just go to an app page. Say, Inside for example:

iOS – https://batch.com/insights/app/ios/inside-com-breaking-news

Android – https://batch.com/insights/app/android/inside-com

And you'll have a lot of statistics there, such as the average number of words / characters used in all of their push notifications, frequency etc. That's really useful to get an overview.

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