New Users is the analytics metric that shows the number of devices on which your app was opened for the first time.
Total and Trend
The total number for the selected time period appears in blue.
The trend is the percentage change of New Users from the previous time period. It's positive and green for increases, and negative and red for decreases.
For example, if you had 75 New Users in the past month and 52 New Users in the previous month, the number of New Users increased by 45.6%.
Graph
The graph shows the number of New Users for a specific date in the time period you selected.
Hover over any point on the graph to see its details. For example, you can see that there were 27 New Users on Sunday, May 17, 2015. 
Breakdown
Your analytics data for New Users is broken down by date. The data is further broken down by platform—iOS devices, Android devices or both (All Platforms). You can also filter this data by country.
For example, you can see that there were 12 New Users on Sunday, May 3, 2015 for iOS devices.
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