WinDirStat is not available for Android but there are a few alternatives with similar functionality. The best Android alternative is DiskUsage, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 50 alternatives to WinDirStat, but unfortunately only two of them are available for Android. If you can't find an alternative you can try to remove all filters.
DiskUsage provides a way to find out which files and directories on the SD card of your Android phone are consuming the most space. It displays diagram with directories/subdirectories proportional to their size. Users are allowed to zoom in to look at specific directory content.
disky can analyze your device and show your data split by directory. Apps are also included, so you get the full picture of what uses your storage.
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Because it has functions simular to WinDirStat and it's for Android!