LanguageTool

LanguageTool is an open-source proofreader and smart writing assistant that catches grammar mistakes, typos, punctuation errors, and stylistic issues. It's built by a European company with servers in Germany, so all data processing follows GDPR. It's a fit for anyone who writes — from bloggers and copywriters to students and companies that want error-free text.

It works simply: you type or paste your text, pick a language, and the tool instantly scans it and underlines anything that might be wrong. Each suggestion comes with an explanation and a fix you can accept with a single click. It measures not only spelling and grammar but also readability and style, so it doesn't just correct your text — it polishes it.