NO - it doesn't leave your local Network!
Your phone only needs to be in the same network as the computer, where you've started your Browser. To test is you shoule usually be able to ping your phone and if any firewall or so is between your pc and our phone ensure that port 8888 is open for http-traffic.
An Android Phone (> Android 5 Lollipop) and a computer with a browser (Chrome/Mozilla are fully supported - others not tested but should work) in the same network (usually same Wifi).
To be able to embed an local website from your phone we need to use normal http.
But the connection from the Phone to the Server and everything else in the background is secured by https!
Please check that your Phone is connected to the same network as your computer and restart the connection if needed.
You can easily configure the refresh rate with the slider on the bottom.
Moving it to the makes it faster moving it to the makes it slower.
But if you still have performance issues please check the Wifi connection speed - perhaps your Wifi signal is too weak or your phone is too busy.
Great! please give me some stars and a short review on Google Play. ;)
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My Name is Stefan M. Marek you get get more information about me - look here: http://marekworks.at
Even if i try to keep securtiy high - i cannot be held responsible for any problems you get because your local network isn't save or your system is unsafe.
You have also to check on your own, if the content you're presenting is allowed to be presented to others.
This App is just an simple app - you have to check what you are allowed to do with it or not.
Last point - I do not intend to track any of your internal or personal data, as there are Google-AdSense/AdMob Advertisings on my page and in the app i cannot control everything, that is happening in there. About that topics please read the related documentation of Google.