Probably the gap between stock keyboards and SwiftKey has narrowed down over the last decade. The key differentiators are: Mixed language model learning: ngram

Probably the gap between stock keyboards and SwiftKey has narrowed down over the last decade. The key differentiators are: Mixed language model learning: ngram models learnt on phone span base language models so it's very good at Spanglish. A probabilistic typing model is learnt on device to capture characteristic patterns of key presses/misses for your typing style.