For iPhone User please try AEI Keyboard Note English. (This app is Free)

Original English Keyboard for iPhone & iPad
* With Arrow Keys
* Ideal Key for iPhone (We called “AEI Keyboard”.)
* iPad Special Ten Keys like PC Ten Keys.

About AEI Keyboard
- Only One Push to input Vowel (letter).
- Less than Two Push to input Alphabet. (any letter)
- Input faster with Two Thumbs.

Useful keyboard Settings (tap"tools")
You can turn off Key Sound from it.

*Please add this Keyboard from iOS Setting and switch "Allow Full Access"