LanguageToolvsQuillbot
Two writing assistant tools, the same questions. Every answer comes from the official pages, with the date we checked. Nothing here is ranked.
last check 2026-10-11
LanguageTool
by LanguageTooler GmbH
Grammar, spelling and style checker for over 30 languages, with an AI paraphraser, in a web editor, desktop and iOS apps, and add-ons.
All LanguageTool factsQuillbot
by Learneo, Inc.
Set of AI writing tools built around a paraphraser, with grammar checking, humanizing, AI detection, plagiarism checks, summaries and chat.
All Quillbot factsWhere they differ
- Free plan limitsLanguageTool: 2,000 characters per text field, 3 AI sentence rephrasings a day, Picky Mode limited.Quillbot: Paraphrasing up to 125 words in 2 modes, summaries up to 1,200 words, 20 AI Chat queries a day.
- Used to train AILanguageTool: Not used: inputs from Individual and Team Plan users are not used to train models; no opt-out needed.Quillbot: Individual accounts: inputs are used for training and personalization by default., Team Plan: text inputs are not used for training.
- LanguagesLanguageTool: Over 30 languages and variants, including English, German, Portuguese, Spanish, French and Dutch.Quillbot: Grammar checks in English, German, Spanish and French.
- Works inLanguageTool: Browser extension, Microsoft Word, LibreOffice, Google Docs, Gmail, Apple Mail, ThunderbirdQuillbot: Browser extension, Microsoft Word
Confirmed for only one of the two so far: writes new text, plagiarism check. The table below shows which.
Same answer for both: free plan, platforms, grammar and spelling, rewrite and change tone.
Plans and prices
As listed on each official pricing page, in the currency we were shown. No conversion, no rounding.
LanguageTool
- Free Free plan$0.00 / month
- Premium Paid, individualPrice not confirmed
- Team TeamPrice not confirmed
Quillbot
- Free Free plan$0.00 / month
- Premium Paid, individualPrice not confirmed
- Team TeamPrice not confirmed
Full comparison with sources
| Writing assistant | ||
| What it is for | ||
| What it is for | Grammar, spelling and style checker for over 30 languages, with an AI paraphraser, in a web editor, desktop and iOS apps, and add-ons. | Set of AI writing tools built around a paraphraser, with grammar checking, humanizing, AI detection, plagiarism checks, summaries and chat. |
| Good for | ||
| Editor's suggestion | No editor suggestion yet | No editor suggestion yet |
| Cost | ||
| Free planA free plan that is not time-limited. Trials are listed separately. |
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| Plans and pricesOriginal currency and billing period. No conversion. |
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| Input and output | ||
| LanguagesLanguages it transcribes or speaks, as stated. |
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| Grammar and spellingMarks grammar, spelling and punctuation mistakes and suggests fixes. |
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| Rewrite and change toneRewrites a sentence or paragraph, for example shorter, more formal or friendlier. |
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| Writes new textDrafts new text from a short instruction, not only fixes what you wrote. |
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| Checking facts | ||
| Plagiarism checkCompares your text with published sources and shows matches. |
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| Workflow | ||
| PlatformsWhere the product is offered: web, desktop app, mobile app, or editor extension. |
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| Works inApps and places it works in, such as a browser extension, Word or Google Docs, as officially listed. |
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| Sources and confidence | ||
| Confidence | Last checked 2026-10-11 Not yet confirmed: Writes new text, Plagiarism check | Last checked 2026-10-11 All compared fields have a confirmed value. |
What it is for
What it is for
LanguageTool:
Grammar, spelling and style checker for over 30 languages, with an AI paraphraser, in a web editor, desktop and iOS apps, and add-ons.
Quillbot:
Set of AI writing tools built around a paraphraser, with grammar checking, humanizing, AI detection, plagiarism checks, summaries and chat.
Editor's suggestion
LanguageTool:
No editor suggestion yetQuillbot:
No editor suggestion yetCost
Free plan
A free plan that is not time-limited. Trials are listed separately.
LanguageTool:
- Supportedhelp.languagetool.orgchecked 2026-10-11
Free plan
Quillbot:
- Supportedhelp.quillbot.comchecked 2026-10-11
Free plan
Plans and prices
LanguageTool:
- Free (Free plan)$0.00 / month
- Premium (Paid, individual)Price not confirmed
- Team (Team)Price not confirmed
- All plan details and sources
Quillbot:
- Free (Free plan)$0.00 / month
- Premium (Paid, individual)Price not confirmed
- Team (Team)Price not confirmed
- All plan details and sources
Input and output
Languages
Languages it transcribes or speaks, as stated.
LanguageTool:
- Over 30 languages and variants, including English, German, Portuguese, Spanish, French and Dutch.languagetool.orgchecked 2026-10-11
Quillbot:
- Grammar checks in English, German, Spanish and French.help.quillbot.comchecked 2026-10-11
Grammar and spelling
Marks grammar, spelling and punctuation mistakes and suggests fixes.
LanguageTool:
- Supportedlanguagetool.orgchecked 2026-10-11
Plan not specified
Quillbot:
- Supportedquillbot.comchecked 2026-10-11
Plan not specified
Rewrite and change tone
Rewrites a sentence or paragraph, for example shorter, more formal or friendlier.
LanguageTool:
- Supportedlanguagetool.orgchecked 2026-10-11
Plan not specified
Quillbot:
- Supportedhelp.quillbot.comchecked 2026-10-11
Plan not specified
Writes new text
Drafts new text from a short instruction, not only fixes what you wrote.
LanguageTool:
- Not yet confirmed
Quillbot:
- Supportedquillbot.comchecked 2026-10-11
Plan not specified
Checking facts
Plagiarism check
Compares your text with published sources and shows matches.
LanguageTool:
- Not yet confirmed
Quillbot:
- Supportedhelp.quillbot.comchecked 2026-10-11
Plans: Premium, Team
Workflow
Platforms
Where the product is offered: web, desktop app, mobile app, or editor extension.
LanguageTool:
- Web, Desktop app, Mobile apphelp.languagetool.org +1checked 2026-10-11
Quillbot:
- Web, Desktop app, Mobile apphelp.quillbot.com +1checked 2026-10-11
Works in
Apps and places it works in, such as a browser extension, Word or Google Docs, as officially listed.
LanguageTool:
- Browser extension, Microsoft Word, LibreOffice, Google Docs, Gmail, Apple Mail, Thunderbirdhelp.languagetool.org +1checked 2026-10-11
Plans: Premium, Team
Quillbot:
- Browser extension, Microsoft Wordquillbot.comchecked 2026-10-11
Sources and confidence
Confidence
LanguageTool:
Last checked 2026-10-11
Not yet confirmed: Writes new text, Plagiarism check
Quillbot:
Last checked 2026-10-11
All compared fields have a confirmed value.