Fleksy is described as 'is the fast and fun way to type that allows you to find and send GIFs, and customize your keyboard with powerful Extensions and beautiful themes' and is a Keyboard App in the OS & Utilities category. There are more than 25 alternatives to Fleksy for a variety of platforms, including Android, Android Tablet, iPhone, iPad and F-Droid. The best alternative is AnySoftKeyboard, which is both free and Open Source. Other great apps like Fleksy are Gboard (Free), Microsoft SwiftKey (Free), FlorisBoard (Free, Open Source) and Hacker's Keyboard (Free, Open Source).
Super lightweight (~ 1/3 MB) yet flexible and powerful soft keyboard. Plus an English plugin still less than 1 MB. (Swype ~15 MB, Minuum ~18 MB, Google Keyboard ~15 MB, Swiftkey ~8 MB, TouchPal ~ 8.5MB)
Multiling O Keyboard vs Fleksy opinions
pros, cons and recent comments
Support for custom themes and layouts. Lightweight ~0.3MB. Multiple types of input prediction. Highly configurable