# Language Tool

## Kurzbeschreibung
**“Your writing assistant”**


**LanguageTool** is primarily an AI editing tool: it improves existing texts with suggestions for grammar, spelling, punctuation, style, tone, and in some cases rephrasing, rather than primarily generating new content like a classic GenAI writer. It is available via web editor, browser, Word, Google Docs, LibreOffice, mail integrations, as well as on Windows/macOS/iOS, and supports more than 30 languages. For developers, there is also an HTTP API and an open-source core technology for self-hosting.

## Claim
More than a Grammar Checker - Your writing assistant

## Geeignet für
- API Integration
- Writing & Editing
- Language Learning
- Texts / Content
- Translations

## Kernfunktionen
- API
- Privacy
- Grammar Check
- Proofreading
- Multilingualism
- Open Source
- Spelling
- Self-Hosting
- Style
- Style Guide
- Teams
- Dictionary
- Punctuation

## Preismodell
- **free:** Free basic version for spelling, grammar, and style checking; some free services are also accessible without an account.
- **subscription:** **Premium / Individual **Advanced checks, longer texts, style and tone suggestions, as well as additional writing features compared to Free.


**Teams** All Premium features plus user management, Team Style Guide, Team Dictionary, and higher text lengths for teams.
- **other:** Business DPA available; core functionality open source, own server possible locally or in the cloud; public HTTP API or developer options available.

## DSGVO und Datenschutz
**Gesamteinschätzung:** Yes

**Overall assessment of hosting & data: **

LanguageTool can be used both as a cloud writing assistant and via its open-source core functionality. A positive aspect is that anyone can run their own LanguageTool server locally or in the cloud; this is a clear advantage for data protection, offline/private cloud use, and sensitive texts. Also positive are the DPA for business customers, Team Style Guide, Team Dictionary, user management, and the fact that inputs are not used for model training. A critical point is that self-hosting does not automatically cover all premium cloud features and that integrations/clients may work to varying degrees with custom servers.


**Conclusion: **

Compared to many writing assistants, LanguageTool is particularly attractive for GDPR-oriented setups because self-hosting is possible; however, for full premium features and business use, the DPA, server location, and scope of features should be reviewed specifically.


[LanguageTool Business Data Processing Agreement](https://languagetool.org/de/legal/dpa)

Compared to many GenAI tools, LanguageTool is well documented, but not entirely frictionless. 


**Positive:** DPA pursuant to Art. 28 GDPR, SCCs, reference to the EU-U.S. DPF, no use of user inputs to train the LanguageTool models, editor storage on AWS Germany, API servers according to the API page in Germany and no storage of the transmitted texts there, plus there is an on-premise option without external data transfer. 


**Limiting:** Since 19/12/2024, the responsible data controller for the service has been Learneo, Inc., USA, and the Privacy Policy provides for international transfers. In apps/extensions, certain telemetry/short-term data is also processed; ignored suggestions may contain text fragments, and for acceleration reasons, checks are kept in main memory for up to 15 minutes. 


**Overall:** from a data protection perspective, well defensible for Business/API/On-Prem, but overall only “conditional” because of the US controller/transfers.


[LanguageTool Business Data Processing Agreement](https://languagetool.org/de/legal/dpa)

## Hosting und Daten
- **On-Prem / lokales Hosting:** abgedeckt
- **Private Cloud / Rechenzentrum:** abgedeckt
- **EU SaaS / Managed:** abgedeckt
- **Hybrid:** teilweise / indirekt
- **AVV / DPA:** abgedeckt
- **Kein Training auf Kundendaten:** abgedeckt
- **Open-Source / Transparenz-Pfad:** abgedeckt

## Herkunft
**Land:** Germany

**Taxonomie:** Germany

LanguageTooler GmbH, Boschstraße 23a, 22761 Hamburg, Germany. For the service/data protection context relevant today, Learneo officially states: Learneo, Inc., 2261 Market Street #10569, San Francisco, CA 94114, United States of America

## Vorteile
- – Very clear focus on writing, correcting, and improving style.
- – 30+ languages and dialects, particularly strong in English, German, Spanish, French, Dutch, and Portuguese.
- – Many integrations: browser, Word, Google Docs, LibreOffice, mail clients, desktop.
- – Open-source core, self-hosting, and API make the tool unusually flexible.
- – Positive for data protection: no use of user inputs for model training, DPA available, on-premise possible.

## Nachteile
- – Not a full-fledged research or general AI assistant; LanguageTool describes itself more as an AI Editing Tool than an AI Writing Tool.
- – According to the current Help Center, the browser extension is now only available for Premium.
- – The practical value increases significantly with Premium; the free version is clearly limited.
- – Although data protection is comparatively well documented, the current data controller is Learneo, Inc. in the USA, which means international data transfers remain relevant.
- – According to official communication, language quality and additional checks are more developed in some major languages than in all peripheral languages.

## Quellen
- Offizielle Website: https://languagetool.org

## Letzter Datenstand
2026-04-16

## Originalseite
https://kifox.ai/en/ki-tools/language-tool-en/