LanguageTool alternatives: 5 tools compared (October 2026)

Grammarly is an AI writing assistant that checks and improves English text in the apps where people write, adds generative AI for drafting and rewriting, and gives companies style guides and brand tones. It serves individuals as well as large organizations.

Key functions

• Generative AI prompts for drafting and revising, 100 a month on Free, 2,000 on Pro
• Sentence rewriting and tone adjustment
• AI and plagiarism detection on Pro

Compared with LanguageTool

• Publishes a price (from €12 per user/month); LanguageTool quotes on request.
• Names 6 security certificates, LanguageTool 0.
• Strong in the same markets as LanguageTool: United States.

Check before buying: All text is processed in AWS US East, so review transfer terms and the data processing agreement before rolling Grammarly out to EU employees. Grammarly focuses on English; for other languages check coverage first. Decide whether AI detection results may be used in decisions about people, since detectors can be wrong.

ChatGPT is OpenAI's general AI assistant for writing, research, analysis and everyday office work, available as a free app for individuals and as a managed workspace for teams and companies.

Key functions

• Chat with GPT-6 models, GPT-6 Luna on the free plan
• Web search for current information inside a conversation
• Data analysis with code execution and charts

Compared with LanguageTool

• Publishes a price (from $8 per month); LanguageTool quotes on request.
• Names 6 security certificates, LanguageTool 0.
• Strong in the same markets as LanguageTool: United States.

Check before buying: Decide which plan employees may use: free and individual plans lack the workspace controls of Business and Enterprise. Sign OpenAI's data processing addendum, check which plugins and connectors may reach company systems, and note that data residency controls are listed for Enterprise only. If you operate in the US, review state rules such as those in Colorado or Illinois before using outputs in hiring or other decisions about people.

Claude is Anthropic's AI assistant for writing, analysis, research and coding, offered as a free app, as individual subscriptions and as Team and Enterprise workspaces for companies.

Key functions

• Research searches the web and connected sources and returns a cited report
• Projects group files and instructions for recurring work
• Connectors bring company tools into the chat

Compared with LanguageTool

• Publishes a price (from $17 per month); LanguageTool quotes on request.
• Names 3 security certificates, LanguageTool 0.
• Strong in the same markets as LanguageTool: United States.

Check before buying: Individual plans (Free, Pro, Max) let users opt out of training, while Team and Enterprise exclude it by default, so route business use through a company workspace. Check which connectors may access internal systems. In the US, state rules in Colorado and Illinois apply if outputs feed into hiring or other decisions about people.

DeepL is a machine translation service from Cologne for companies that translate text, documents and spoken conversations, with glossaries, translation memory and a writing assistant for editing.

Key functions

• Translates whole documents such as Word, PDF, PowerPoint and Excel files while keeping the layout
• Glossaries and translation memory keep terminology and earlier translations consistent
• DeepL Write revises text for style and tone, included in the Business plan

Compared with LanguageTool

• Publishes a price (from €7.49 per user/month); LanguageTool quotes on request.
• Can store data in the EU; LanguageTool states no EU option.
• Headquartered in Germany, LanguageTool in United States.
• Names 3 security certificates, LanguageTool 0.

Check before buying: Use a paid plan for business content, because the free version may use texts for training according to the privacy policy. DeepL requires a separate data processing agreement for personal data, available through sales. Single sign-on is available on Team and Business only for more than 50 users, and on Enterprise without that threshold. Check whether translated contracts or HR letters still need review by a person.

Wordtune is an AI writing assistant from AI21 Labs that rewrites, summarizes and corrects English text. It suits individuals and small teams that write a lot in English and want low-cost help with phrasing.

Key functions

• Sentence rewrites with suggestions for clarity, vocabulary and fluency
• AI summaries of longer texts
• AI text generation plus spelling and grammar checks

Compared with LanguageTool

• Publishes a price (from $4.89 per month); LanguageTool quotes on request.
• Strongest elsewhere: Israel.

Check before buying: Data is stored on servers in the United States, so review the transfer mechanisms before using Wordtune with EU personal or confidential data. No published plan includes SSO or central administration, and no data processing agreement is linked on the plans page; ask AI21 Labs before a team rollout. There are no refunds, so use the 3-day trial first.