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Fleksy - Happy Typing
This app represents the pinnacle of an own goal on the part of Apple. The optionally-invisible keyboard has great prediction, and would be useful for sighted and sight-impared people alike, but it is trapped inside its own app.
That's right, you need to open this app if you want to use a decent predictive keyboard, then copy the text to an app that isn't Mail, Facebook, or Twitter.
Inside the app, a dialog appears that says:
Unfortunately, due to iOS limitations, it's not possible to replace the standard keyboard. Here's how you can let Apple know you really like Fleksy.
[Button to email Apple] [Button to review on App Store]
We can continue hoping that Apple will allow apps like this to blossom, but history suggests that we'll be waiting a while.