LanguageTool

Copywriting

LanguageTool is a multilingual grammar, spelling, style, and paraphrasing checker supporting 30+ languages and dialects. It runs as browser extensions, desktop apps, and integrations for Gmail, Google Docs, Word, and more. Premium adds advanced checks, higher character limits, unlimited AI paraphrasing, and team management features.

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Features & details

Full overview from our catalog (read-only reference).

Category (short)

Copywriting

Sponsored note

Target audience

Multilingual writers and international teams, Users wanting Grammarly alternative with open-source core, Organizations needing browser-wide writing assistance

Best for

Multilingual writers and international teams, Non-native English professionals, Users wanting Grammarly alternative with open-source core, Organizations needing browser-wide writing assistance, Students and academics (20% education discount available)

Pricing notes

Verified July 2026 via languagetool.org and Help Center. Free: basic spelling/grammar, 10,000 characters per check, limited advanced rules. Premium: €19.90/mo monthly, €59.89/yr (~€4.90/mo), €99.90/2yr (~€4.16/mo). USD equivalents often cited as $24.90/mo monthly, ~$4.99–7/mo annual. Teams: €56.90/user/yr for up to 20 users. Premium adds 150,000-character limit, unlimited paraphrasing, and advanced style checks. 14-day money-back guarantee. Free tier trimmed in recent years—advanced rules moved behind paywall.

Pros & cons

Editorial notes to help compare fit before opening the vendor site.

Pros

30+ languages with dialect support
Open-source core enables self-hosting
Unlimited AI paraphrasing on Premium
Works across virtually all writing surfaces
Affordable annual Premium (~$5/mo effective)

Cons

Free tier significantly reduced (10K chars, basic rules only)
English-only depth lags Grammarly
Premium required for Picky Mode and advanced style
Team plan limited to 20 users per tier
Paraphrasing quality varies by language

Review notes

Context from the listing review and editorial research.

LanguageTool remains the leading open-source-friendly grammar checker with strong multilingual support. Premium value is clearest for daily multilingual writers using browser extensions. Free tier is usable but increasingly limited vs 2024. Compared to Grammarly, LanguageTool wins on language breadth and self-hosting; Grammarly wins on English-only polish and tone detection depth.

Extended features

In-depth description and capability notes.

Grammar, spelling, and style checking in 30+ languages AI-powered paraphrasing and sentence rewriting Browser extensions for Chrome, Firefox, Safari, Edge, and Opera Integrations: Gmail, Google Docs, Word, Outlook, LibreOffice Picky Mode for advanced style and punctuation refinements Open-source core with self-hosted server option Statistics dashboard for writing productivity tracking

Use cases

LanguageTool fits writers, professionals, and teams needing multilingual proofreading and paraphrasing across browsers and document editors. Email and document proofreading in multiple languages Non-native English writing improvement Style and tone adjustments for formal vs casual writing Team-wide writing quality assurance Self-hosted grammar checking for privacy-sensitive orgs Academic and professional writing with dialect selection (6 English variants)