Useful, but need to spell check... – Math Ref Review

I find the app very useful, but there are several spelling errors, which can be temporarily confusing, and somewhat annoying to see over and over again - for example, in the Probability & Statistics section, they spell the word "trial" as "trail", and spell "rely" as "relay" - it would appear that English is a second language for the developers. In any event, if you don't mind some recurring typos, you might find this app very useful.
Review by AppsAddValue on Math Ref.