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Please double check your answers.
@Peanutswar
The website is a bit laggy. Is there any application for this online tool? Just for practicing Logic Gates and any other related subjects. I tried searching on their website but I can't find any.

Good day @Maus0728,
The only thing I used for my logic gates are:
1. draw.io
2. tinkercad.com
[1][2] are quite bit laggy if you are trying to use with your phone.
or this application (you can find in google play store) but you need to pay else try other way to use this for free.
3. EveryCircuit