Have more of a visual feedback when the keys are pressed. Either keys popping up, glow, etc.
The button should already change the color when you press it. Does this work on your device?
And in the textfield you should always see the letter that will be typed when you release the finger. So the basic idea is that you don't have to look at the keyboard normally.
But yes it could be even more visible.
Although the button layout / concept is insanely good, I still have many typos throughout the day. Even more often I only realize it after a few more characters. An additional popup like in the picture would help me a loooot.
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