I know it looks difficult, but if you already touch type on PC then Minuum is a great mobile keyboard. You just have to train yourself to not try being precise with it (impossible to do quickly). I actually find it easier to use if I don’t look at it while I’m typing. I’ve been using it since it was on Indiegogo and haven’t seen anything else worth trying. I’m pretty sure you can even get it for free now.

Note that it does learn from you over time, so the more you use it the more accurate it becomes.

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In the above image, I’ve put the cursor back on the word “accurate” for a little demo. The first group of letters are the ones that I actually hit. After that are Minuum’s guesses in order of probability of being correct.

If you want to type a word that isn’t in its dictionary yet, you can swipe up from the top row to bring up a full keyboard. Selecting the word once it’s typed usually adds it, though for some reason they’ve excluded swears from that.