Grammarly Expands AI Writing to Six Languages

Grammarly is expanding its AI-powered writing tools beyond English, rolling out grammar, tone, and clarity suggestions in Spanish, French, Portuguese, German, and Italian — joining English as its six core languages. The company says its models can also translate those six languages into 19 others without leaving the app.

Grammarly’s language work combines long-standing linguist expertise with large language models: the company uses open-source LLMs fine-tuned by analytical linguists and hosted on Grammarly’s infrastructure with “very tight training rules,” according to VP of enterprise product Luke Behnke. The rollout was beta-tested with “about a million” users, and native speakers accepted suggestions at rates similar to English users.

For advanced features, Grammarly supports optional third-party LLMs (for example, OpenAI’s), which aren’t permitted to train on Grammarly user data; Grammarly’s own models can be trained on user data unless a user opts out. Enterprise and education customers have training disabled by default. The update aligns with Grammarly’s broader push to be an AI productivity platform — following its Superhuman acquisition and the launch of nine AI agents — and arrives amid growing competition as Google and Apple bring more multilingual AI features to their products.

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