The keyboard with the best prediction and self learning was my (first smartphone) Sony Xperia Z5 from 2015. I only realized it was a Sony specific app later in

The keyboard with the best prediction and self learning was my (first smartphone) Sony Xperia Z5 from 2015. I only realized it was a Sony specific app later in life. (I didn't understand auto correction memes until I got a work phone with a google keyboard.) Sadly they don't offer it as a stand alone app. I would pay for it. I have settled for FUTO Keyboard for now. Bevor that I used SwiftKey. (The Sony is still the only one where I did see contextual self-learning/prediction.)