Wifistidy.com is some useful app. It is very useful app we can use it many ways and we can study everything that whta we want to know it had some materials and good information about everything. But the problem is the materials did not have much depth information it consists of low informatiom but it is also useful and it consists of information that is just useful to us but if you want a detailed information it is not useful I think the team had to update some materials because some of the materials are not opening and showing nothing is there.
I Will recommand this app it is useful and very helpful to those who are suffering to get a rare matetial it consists that materials also.