Lviv, Ukraine based custom software development company N-iX, founded by Andrew Pavliv, has created a nice keyboard for iPhones, iPads and iPods running iOS 8 through its spin-off firm.
Named ThickButtons, it helps big-fingered users type more efficiently by using patented technology which enlarges and highlights keys you'll most likely press next while shrinking the remaining ones to reduce the chance of making an error.
Such an input method arguably makes typing with one finger more accurate, especially on four-inch iPhones. The software doesn’t require additional training and doesn’t depend on dictionary.
ThickButtons is $1.99 in the App Store.