LanguageTool

LanguageTool is a grammar and style checker that finds spelling, grammar and word choice errors in more than 30 languages and dialects.

Its main languages are English, Spanish, German, French, Dutch and Portuguese, so it suits people who write in more than one of them.

Beyond fixing typos, LanguageTool flags style problems, which makes it closer to a proofreader than a basic spell check.

If you write in English, you can pick from six standard varieties, so the checker follows the spelling conventions you actually use.

An AI-based rephrasing function sits next to the corrections.

It rewrites whole sentences to be simpler, shorter or more formal, which helps when a sentence is correct but clumsy.

The category list also includes an API, so developers can build the same checking into their own products.

The rephrasing is the feature to try first if grammar fixes alone are not enough for you.