I'm a little surprised that no one has mentioned Messagease. Don't let the looks of it scare you off. Yes, it has a learning curve to it, but it is very much worth it in my opinion! It took a couple of days for me to learn it and get comfortable with it, a week to get good at it. Now, I won't use anything else. It is truly the first keyboard designed for touchscreens. When my friends see it pop up on my phone, they always give me a funny look at first. Then when they see how fast and accurately I can type on it, their eyes just get really big in amazement! I love seeing that reaction! Also, it has a game to help you learn it. Well, that's my two cents.
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watching the video on how to use it gave me a headache.