# Alternatives to LanguageTool Open source multilingual grammar. LanguageTool ranks #4 of 9 in AI writing assistants, with an Alt Score of 82. It is licensed under LGPL-2.1-or-later, open source with paid hosting and available on Web, Browser extension, Windows and macOS. 8 of 10 checklist rows are verified against a public source. Source: https://altcatalog.com/alternatives/languagetool/ Category: AI writing assistants ## Overview - **Who it's for**: Writers, students, professionals, and organizations who write in English, German, Spanish, French, or one of 30+ other supported languages and want an automated check on their text before sending or publishing it. - **What you get**: LanguageTool checks spelling, grammar, punctuation, and capitalization, and flags style issues like redundant or overused phrasing. It also offers paraphrasing suggestions to rewrite sentences as more formal, concise, fluent, or simple. A free tier covers basic spelling and punctuation checks, while Premium adds more advanced grammar and style detection. It has open-source roots and also offers a developer API. - **How it works**: You install a browser extension, desktop app, or office/email plugin (Chrome, Firefox, Word, Google Docs, Outlook, etc.), and it underlines errors and suggests corrections as you type; you can also paste text directly into the web checker or call the API. ## Profile - **License**: LGPL-2.1-or-later (verified 2026-07-10) - **Pricing model**: OSS + paid hosting (verified 2026-07-10) - **Starts at**: ? - **Platforms**: Web, Browser extension, Windows, macOS - **Status**: active (verified 2026-07-10) ## Ranked alternatives | # | App | Alt Score | Licence | Platforms | |---|-----|-----------|---------|-----------| | 1 | [Grammarly](https://altcatalog.com/alternatives/grammarly.md) | 86 | Proprietary | Windows, macOS, Web, Browser extension | | 2 | [QuillBot](https://altcatalog.com/alternatives/quillbot.md) | 86 | Proprietary | Web, Browser extension, Windows, macOS | | 3 | [Jasper](https://altcatalog.com/alternatives/jasper.md) | 82 | Proprietary | Web, Browser extension | | 4 | [DeepL Write](https://altcatalog.com/alternatives/deepl-write.md) | 73 | Proprietary | Web, Windows, macOS, Browser extension | | 5 | [ProWritingAid](https://altcatalog.com/alternatives/prowritingaid.md) | 73 | Proprietary | Web, Browser extension, Windows, macOS | | 6 | [Wordtune](https://altcatalog.com/alternatives/wordtune.md) | 73 | Proprietary | Web, Browser extension, iOS | | 7 | [Copy.ai](https://altcatalog.com/alternatives/copyai.md) | 64 | Proprietary | ? | | 8 | [Sudowrite](https://altcatalog.com/alternatives/sudowrite.md) | 46 | Proprietary | Web | Alt Score = Verified coverage (90%) + Visibility (10%). See https://altcatalog.com/how-alt-score-works/ ## Feature comparison Legend: Yes / No / Partial / ? (not verified). | AI writing assistants checklist | LanguageTool | Grammarly | QuillBot | Jasper | DeepL Write | ProWritingAid | |---|---|---|---|---|---|---| | Pricing model | OSS + paid hosting | Freemium | Freemium | Subscription | Freemium | Freemium | | Starts at | ? | $12/month (billed annually) | €8.33/month (billed annually) | $59/month per seat (billed annually) | ? | €120/year (Premium, billed yearly) | | License | LGPL-2.1-or-later | Proprietary | Proprietary | Proprietary | Proprietary | Proprietary | | Platforms | Web, Browser extension, Windows, macOS | Windows, macOS, Web, Browser extension, iOS, Android | Web, Browser extension, Windows, macOS, iOS, Android | Web, Browser extension | Web, Windows, macOS, Browser extension | Web, Browser extension, Windows, macOS | | Grammar & spelling | Yes | Yes | Yes | Yes | Yes | Yes | | Style / tone rewriting | Yes | Yes | Yes | Yes | Yes | Yes | | Long-form generation | ? | Yes | Yes | Yes | No | Partial | | Plagiarism detection | ? | Yes | Yes | Yes | ? | Yes | | Browser extension | Yes | Yes | Yes | Yes | Yes | Yes | | Office / Docs integration | Yes | Yes | Yes | Yes | Yes | Yes | | Self-hostable | Yes | ? | ? | ? | ? | ? | | Free tier limits | Yes | Yes | Partial | No | Yes | Partial | | Multilingual | Yes | Partial | Yes | Yes | Yes | ? | | Data used for training (opt-out) | Yes | Yes | Yes | Yes | Yes | Yes | ## Sources Sources for LanguageTool. Each alternative is sourced on its own page. - **Platforms**: Web, Browser extension, Windows, macOS — (verified 2026-07-10) - Quote: “LanguageTool adds advanced spelling, grammar and style correction to Windows and many other services and apps.” - **License**: LGPL-2.1-or-later — (verified 2026-07-10) - Quote: “The LanguageTool core (this repo) is freely available under the LGPL 2.1 or later.” - **Pricing model**: OSS + paid hosting — (verified 2026-07-10) - Note: OSS core (LGPL) + paid Premium cloud. - Quote: “LanguageTool is open-source proofreading software for English, Spanish, French, German,” - **Status**: active — (verified 2026-07-10) - Quote: “## 6.7 (2025-10-01)” - **Grammar & spelling**: Yes — (verified 2026-07-10) - Quote: “Get developer access to the same technology that powers our Premium grammar, style, and spelling checker.” - **Style / tone rewriting**: Yes — (verified 2026-07-10) - Quote: “rephrase your sentences to be shorter, more fluent, or more formal” - **Browser extension**: Yes — (verified 2026-07-10) - Quote: “LanguageTool adds advanced spelling, grammar and style correction to Chrome and many other services and apps.” - **Office / Docs integration**: Yes — (verified 2026-07-10) - Quote: “LanguageTool adds advanced spelling, grammar and style correction to Google Docs and many other services and apps.” - **Self-hostable**: Yes — (verified 2026-07-10) - Quote: “LanguageTool comes with its own embedded HTTP server, so you can send a text to a local instance of LanguageTool.” - **Free tier limits**: Yes — (verified 2026-07-10) - Quote: “Character limit per text field” - **Multilingual**: Yes — (verified 2026-07-10) - Quote: “It supports more than 30 languages, including English, French, Spanish, and German.” - **Data used for training (opt-out)**: Yes — (verified 2026-07-10) - Quote: “None of the texts you send to the API are stored to ensure full privacy” --- Ranked by verified data, never by who paid. https://altcatalog.com/trust/