For a lot of writers Grammarly is an invaluable tool to help nail grammar, punctuation, and the many other pitfalls that English throws your way. There's no full-featured version for mobile, but the Grammarly Keyboard comes pretty close. It now has another feature from the desktop version: Tone Detector, which helps you send the right message at the right time. Or alternately, helps curb your less savory texting habits.

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