SwiftKey

SwiftKey was one of the first keyboards to prove that AI-powered prediction could genuinely improve mobile typing, and it remains among the best options available. The personalized predictions that learn from your writing across different apps improve noticeably over time, and multilingual typing across up to five languages simultaneously is a standout feature for polyglot users. Support for 700+ languages is unmatched. Swipe typing (Flow) is smooth and accurate, and the theme customization options are extensive. Microsoft's acquisition brought Bing AI integration for text generation and tone adjustment, adding useful AI assistant capabilities directly within the keyboard. Cross-device prediction sync through a Microsoft account is a practical touch. As a standalone AI assistant, the Bing integration provides useful but basic text manipulation -- it lacks the depth of dedicated AI assistants. The iOS version feels more constrained than Android due to platform limitations. With a billion downloads, SwiftKey has proven its value. Compared to Gboard, SwiftKey offers better personalization and multilingual support but lacks integrated search. For users who prioritize prediction accuracy and multilingual capability, SwiftKey is the stronger choice.