13 European Writing Assistance & Grammar vendors.
Writing Assistance & Grammar: Grammar checking, spell checking, style advice and AI writing assistants. Below, every vendor in the knowledge base headquartered in the EU or the EEA, each checked by us for headquarters, owner, hosting and licence. Non-European vendors are listed at the bottom with a link to their European alternatives.
32 vendors in total: 13 European, 12 American, 7 other; 4 open source. Last checked: 5 October 2026.
Why this matters for digital sovereignty
Writing assistants read the full text you type, including confidential drafts and sometimes trade secrets, and often send it to external servers for analysis. Check where that processing happens, whether your text is used to train models, and whether local or EU-based processing is available.
European vendors
- CKEditorSelf-hosted / open source
Rich text editor developed by CKSource (legally headquartered in Warsaw, Poland, ul. Okopowa 58/72), distributed under a dual GPL/commercial licence. Actively sold in 2026 with integrated AI features (AI Chat, AI Review, AI Translate, AI Quick Actions) that keep human review control over AI-generated edits.
Poland · open-source
- DeepL WriteEU sovereign
AI-powered writing assistant from DeepL that corrects grammar, improves word choice, and enhances clarity and style across English, German, French, and Spanish (with additional languages in other tiers). Built on DeepL's translation-informed language models. Free tier plus DeepL Write Pro subscription for individuals and enterprise/teams.
Germany
- Duden MentorEU sovereign
German grammar and spelling checker with AI-powered writing assistant
Germany
- LanguageToolEU-hosted, non-EU parent
German open-source grammar, spelling, and style checker supporting 30+ languages
Germany · owner in United States · open-source
- MerciAppEU sovereign
French AI-powered writing assistant for correction and style improvement
France
- NeuroflashEU sovereign
German AI tool for content generation, copywriting and SEO optimization
Germany
- Notepad++Self-hosted / open source
Free open-source text and source code editor for Windows with syntax highlighting and plugins.
France · open-source
- ReversoEU sovereign
French translation, grammar and writing platform (Neuilly-sur-Seine) with 80M+ monthly users.
France
- ScribensEU sovereign
French grammar and spelling checker (Montpellier) for 40+ languages.
France
- Surfer SEOEU sovereign
Polish (Wrocław) AI-driven content optimization and writing platform with SERP analysis, content editor, and NLP-based recommendations. Acquired by French Positive Group in October 2025; remains an active SaaS product with infrastructure marketed as hosted entirely in Europe.
Poland
- TextmetricsEU sovereign
Dutch AI-powered writing assistant for content optimization and SEO
Netherlands
- TypewiseEU sovereign
Swiss AI writing assistant for customer management with natural language processing
Switzerland
- WritefullEU-hosted, non-EU parent
Dutch academic writing assistant (Amsterdam, Keizersgracht 241; founded 2018) specialized for research and scholarly writing, with language models trained on journal articles, offering paraphrasing, copyediting, style feedback, and LaTeX support. Integrates with Word, Overleaf, and Google Docs; used at 1,500+ institutions and by major publishers (ACS, Sage, RSC). Fully acquired by Digital Science (London, UK; ultimate parent Holtzbrinck Publishing Group, Stuttgart, Germany) in November 2023, after partial ownership since 2018, but Writefull's operational base remains in Amsterdam.
Netherlands · owner in United Kingdom
Non-European vendors in this category
For each vendor, the page with European alternatives and the sovereignty profile.
- Non-EU vendorAntidoteCanada · 8 EU alternatives
- Non-EU vendorBBEditUnited States · 1 EU alternative
- Non-EU vendorCompose AIUnited States · 8 EU alternatives
- Non-EU vendorCopy.aiUnited States · 8 EU alternatives
- Non-EU vendorGingerUnited States · 8 EU alternatives
- Non-EU vendorHemingway AppUnited States · 8 EU alternatives
- Non-EU vendorJasperUnited States · 8 EU alternatives
- Non-EU vendorOutwriteAustralia · 8 EU alternatives
- Non-EU vendorProWritingAidUnited Kingdom · 8 EU alternatives
- Non-EU vendorQuillBotUnited States · 8 EU alternatives
- Non-EU vendorRytrUnited States · 8 EU alternatives
- Self-hosted / open sourceSapling AIUnited States · 8 EU alternatives
- Non-EU vendorSuperhuman (Grammarly)United States · 8 EU alternatives
- Non-EU vendorTrinka AIIndia · 8 EU alternatives
- Non-EU vendorWhiteSmokeUnited States · 8 EU alternatives
- Non-EU vendorWordtuneIsrael · 8 EU alternatives
- Non-EU vendorWordvice AIUnited States · 8 EU alternatives
- Non-EU vendorWriterUnited States · 8 EU alternatives
- Non-EU vendorWritesonicUnited States · 8 EU alternatives
Frequently asked questions
Which European Writing Assistance & Grammar vendors are there?
The knowledge base lists 13 European Writing Assistance & Grammar vendors, including CKEditor, DeepL Write, Duden Mentor and LanguageTool. Every record is checked for headquarters, ultimate owner, hosting locations and licence.
Are there open-source options for Writing Assistance & Grammar?
Yes. Open-source Writing Assistance & Grammar software from Europe includes CKEditor, LanguageTool and Notepad++; you can self-host it with the encryption keys under your own control.