Our verdict: LanguageTool is the strongest multilingual alternative to Grammarly, and the free plan already catches most spelling and grammar mistakes. The desktop app brings the checks into Windows programs like Outlook, but the advanced style rules, longer texts and unlimited rephrasing need Premium.
About LanguageTool
LanguageTool checks texts for spelling, grammar and punctuation errors in more than thirty languages and adds style suggestions such as wordiness, repetition and informal wording. The Windows app underlines errors directly where you type in supported programs, including Outlook, and you apply a suggestion with a click.
The app works without registration. Signing in with a free LanguageTool account adds your personal dictionary and style rules. The free Basic plan limits each check to 2,000 characters per text field and allows three AI sentence rephrasings per day; Premium raises the limit to 150,000 characters and adds over 20,000 extra checks for major languages, a style guide and unlimited rephrasing. Text is checked on LanguageTool's servers, so the app needs an internet connection.
What it does well
- Inline suggestions. Errors are underlined where you write and fixed with one click.
- 30+ languages. Checks English, German, French, Spanish, Dutch, Portuguese, Polish and many more.
- Outlook integration. Checks emails in Outlook before you send them.
- Personal dictionary. Sign in to use your own words and custom rules everywhere.
- AI rephrasing. Rewrites sentences to be more formal, fluent or shorter.
Who it is for
Good fit
People who write emails and documents in several languages and want checks across Windows apps.
Look elsewhere
Anyone who must keep texts offline, or who needs long-document checks without paying.
Pros and cons
Pros
- Free plan with solid grammar and spelling checks
- Supports more than 30 languages
- Works inside Windows apps such as Outlook
- No registration needed for basic use
Cons
- Free plan checks only 2,000 characters per text field
- Advanced style checks and unlimited rephrasing need Premium
- Text is sent to LanguageTool servers for checking
How to install LanguageTool
The download button fetches an .appinstaller file from languagetool.org; opening it starts Windows App Installer, which downloads and installs the app and keeps it updated. No account is required, but signing in loads your dictionary and Premium features.
Questions about LanguageTool
Is LanguageTool free?
Yes, there is a free Basic plan that needs no account. It checks up to 2,000 characters per text field and allows three AI rephrasings per day. Premium is a paid subscription with longer texts, extra style checks and unlimited rephrasing.
Does LanguageTool work offline?
The Windows app checks text on LanguageTool's servers, so it needs an internet connection.
Is LanguageTool better than Grammarly?
LanguageTool supports many more languages, while Grammarly focuses on English. Both reserve advanced style suggestions for paid plans.
