I tried Unexpected Keyboard on Android; it's the first open source app worth challenging Gboard

During my investigation of keyboard alternatives to Gboard on Android, an app called Unexpected Keyboard particularly impressed me. Unlike common keyboards, Unexpected Keyboard eschews conventional layouts and offers an innovative solution through its gesture-based system. This approach allows users to access symbols, numbers, and special characters more efficiently by swiping in various directions on each key.

Initially, its unconventional design might seem bothersome, but after familiarizing oneself with the method, typing becomes remarkably swift, particularly when dealing with symbols like parentheses, quotation marks, and slashes. Although not the first choice for everyone, its unique features and open-source nature make it a noteworthy option for those prioritizing privacy and customization.