Catch the spelling, spacing and punctuation slips before anyone else does.
The mechanical checks — repeated words, double spaces, a space before a comma, a sentence starting in lower case, an unclosed bracket, a sentence that has run away from you — happen instantly in your browser and cost nothing.
Full grammar checking, the kind that understands agreement and tense, needs a language model. We use LanguageTool, which is open source and can be self-hosted free in all six languages. That is deliberate: it keeps the tool free without a monthly bill behind it.
English, French, German, Spanish, Italian and Portuguese.
It shows you what and where. Automatic fixing tends to introduce its own errors, so the decision stays with you.
The instant checks run entirely in your browser. Nothing leaves your device for those.