LanguageTool

★★★★☆4.5 / 5 editorial Freemium Free for basic checking; Premium from $4.99/mo on annual billing adds advanced style and formal-language checks.

Multilingual grammar, style, and spell checker for 30+ languages

✓ Editor-verified listing — details reviewed by Grab AI Tool editors; pricing re-checked regularly.

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#grammar checking#multilingual#proofreading#editing#style checking

What is LanguageTool?

LanguageTool is a multilingual writing checker that reviews grammar, spelling, punctuation, and style in more than thirty languages, including English, German, Spanish, French, and Portuguese. Unlike checkers built only for English, it understands regional variants and formal versus informal registers, which makes it a favorite in Europe and among anyone who writes in more than one language.

It runs almost everywhere: browser extensions, Word and Google Docs add-ins, email clients, and desktop apps, with an open-source core you can even self-host. Premium adds advanced style suggestions, formal-language checks, and team style guides. Its suggestions are conservative and accuracy-focused rather than generative, so it polishes your words instead of replacing them with AI-generated alternatives.

Key Features

Grammar and style checking in 30+ languages
Regional variants and formal/informal registers
Extensions for browsers, Word, Docs, and email
Team style guides and personal dictionary
Open-source core with self-hosting option

Pros

Best multilingual coverage among major checkers
Privacy-friendly with self-hosting available
Works inside nearly every writing app

Cons

English suggestions trail Grammarly in depth
Premium needed for advanced style checks
Interface is functional rather than beautiful

Pricing

Model: Freemium
Free for basic checking; Premium from $4.99/mo on annual billing adds advanced style and formal-language checks.

Adding Up Your AI Bill?

If you pay for LanguageTool alongside other AI subscriptions, the monthly total adds up quietly. Tick every tool you pay for in our free AI Tool Cost Calculator to see your real monthly and yearly bill — and spot overlaps you can cut. Still choosing? Start with our guide on how to choose the right AI tool.