Compatible with iOS 8, 9 and 10
Also: iKeywi 2 (iOS 7)
Not compatible with iPad
Also: iKeywi HD for iPad
iKeywi is a tweak which can let you customize the keyboard on your iPhone.
> Adds an extra row to your keyboard
> Supports all languages (*)(**)(***)
> Supports both portrait and landscape mode
> Set keys as cursor mover and undo/redo function
> Compatible with iPhone 4/4s/5/5s/5c/6 and 6 plus
> ...and more!
* Not support: Kana(かな入力), Korean 3x3 (10키), Pinyin 3x3(十键拼音), Strokes(笔画) and Handwriting(手寫).
** Zhuyin(注音) and Thai 5-Row only support Number and Symbol keypad.
*** This tweak can't work in some apps which need root permission, such as iFile and Cydia
**** Not work for AppStore 3rd party keyboard.
Configure options from Settings app