EU Sovereignty Score
EU-hosted, non-EU parentAIHeadquarters: DE

LanguageTool: sovereignty score and 8 European alternatives

LanguageTool is an AI writing assistant that checks grammar, spelling, punctuation, casing and style, and can rephrase sentences with an AI feature. It supports more than 30 languages and is available as a browser extension, as an add-in for Google Docs, Word and LibreOffice, as an email add-on, as a desktop app and as a proofreading API. A free and a paid version exist.

LanguageTool began in 2003 in Potsdam as an open-source project. The core software is still available under the LGPL 2.1 or later and can be run as your own server; the commercial service itself is not offered as open source. The product is owned by Learneo, Inc. of California, which its privacy notice names as data controller; LanguageTooler GmbH in Hamburg handles part of the processing. Its data processing agreement lists hosting by Telekom Germany and Hetzner (Germany), Google Cloud (Dublin) and AWS (Munich, for texts in the editor and desktop app), and OpenAI and Aleph Alpha for rephrasing. A US parent company is relevant when assessing jurisdiction.

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Sovereignty score
94 / 1000 = high exposure
100 = sovereign
  • Jurisdiction SOV-2100
    Headquartered in the EU: European law applies
  • Data residency SOV-3100
    EU-only hosting
  • Cryptographic key sovereignty SOV-390
    Self-hostable: encryption keys under your own control
  • Freedom from lock-in SOV-680
    Open source: low switching costs
  • Source & runtime sovereignty SOV-4 · SOV-6100
    Source code auditable, forkable and self-hostable

SOV codes: the matching objective in the European Commission's Cloud Sovereignty Framework. Official source

How the score is calculated

Facts and evidence

Last checked October 9, 2026
Headquarters
DE (EU)Verified by hand
Ultimate parent company
USVerified by hand
Sovereignty model
Vendor-hosted (EU)Verified by hand
Data hosting
EUVerified by hand
Open-source
YesVerified by hand
GDPR-compliant
YesVendor-stated
Hosting signal
CLOUDFLARENET - Cloudflare, Inc., US (US)Technically measured
Category
AI
Type
Product
Website
languagetool.org ↗

The hosting signal shows the network that serves the vendor's website, often a CDN, and not necessarily where the service or your data is hosted. How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to LanguageTool

The European alternatives to LanguageTool come from our knowledge base of over 6,800 vendors. We only list vendors headquartered in the EU or the EEA; fully European-owned vendors rank before vendors with a foreign owner. For each alternative you see the country, the open-source status and a short description.

Score per alternative: 0 = high exposure, 100 = sovereign

55 European AI vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

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Why digital sovereignty matters with LanguageTool

LanguageTool is headquartered in DE and therefore falls under European law: the GDPR, NIS2 and the Data Act. No foreign legislation can compel access to your data. The ultimate owner is based in US. Foreign control undermines part of the certainty a European headquarters offers.

Data is hosted exclusively in the EU, so LanguageTool scores best on data residency.

LanguageTool is open source. You can audit the source code, self-host the software and keep the encryption keys under your own control. Switching is easier because data and software are not tied to a single party.

What this means for your organisation depends on your whole stack and context. The free assessment weighs LanguageTool together with your other vendors and gives a total score, a heatmap and the main risk drivers.

Frequently asked questions

What is the best European alternative to LanguageTool?

It depends on your use case. Strong EU alternatives to LanguageTool include Aleph Alpha, Almato and Almawave. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to LanguageTool?

Our list of EU alternatives to LanguageTool is mostly commercial options. Browse the category on the map for open-source choices.

Is LanguageTool GDPR-compliant and where is the data hosted?

LanguageTool is headquartered in DE (EU) and hosts data in EU. It is also open-source, so you can self-host it. That makes LanguageTool an EU-sovereign choice in its own right; the EU alternatives on this page are comparable European tools.

Details and sources

Verified by handHeadquarters, owner, hosting locations and licence have been checked by us against public sources. Free of charge and for every vendor, not a paid label. Nothing in this knowledge base is taken over automatically. Last checked on October 9, 2026.

Sources

Public sources used in the latest check of this record.

Compliance evidence

The links below point to the vendor's own public documents. We only record what we found: a missing link means "not found publicly", not "not compliant".

No public compliance evidence has been recorded for this vendor yet. Do you know its DPA or subprocessor list? Something wrong? Suggest a correction

Digital sovereignty in AI

AI: Artificial intelligence — large language models, translation, generative AI. In this category the choice of vendor determines who has legal access to your data, where that data lives and how easily you can switch later.

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8 European alternatives to LanguageTool — GDPR-compliant & EU-hosted · EU Sovereignty Score