Grammarly
grammarly.com
Catches the grammar and tone problems you stop seeing in your own draft
Free account
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languagetool.org
Open-source grammar checking across more than twenty languages.
The alternative for anyone writing outside English: genuinely strong German, French, Spanish, Dutch and Polish rules, and British and American English kept properly separate rather than blurred together. The engine is open source and can be self-hosted, which matters if drafts should not travel to a third party. Free checks are limited by length rather than by count.
Questions
Works the moment the page loads. No account, no email, no trial. The free tier caps how much text you can check in one pass and holds the rewriting features for Premium.
Yes. LanguageTool sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
The free tier caps how much text you can check in one pass and holds the rewriting features for Premium.
Alternatives
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grammarly.com
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Rewrites difficult English into simpler words, keeping the meaning
wordcounter.net
Counts words and characters, and shows which words you overuse