LanguageTool vs Grammarly vs QuillBot vs Undetectable AI

Which one fits you in 2026? Traffic, pricing, input → output, tasks and community side by side.

Your tool
LanguageTool
vs
Competitor 1
Grammarly
Competitor 2
QuillBot
Competitor 3
Undetectable AI
Compare
4 tools · best value per row highlighted
Your tool LanguageTool
languagetool.org
LanguageTool checks grammar, spelling, punctuation, casing and style as you write, and works in more than 30 languages and dialects, including English, German, Portuguese, Spanish, French and Dutch.
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Competitor Grammarly
grammarly.com
Writing confidence that follows you everywhere
Make main Remove
Competitor QuillBot
quillbot.com
Rephrase until it sounds right
Make main Remove
Competitor Undetectable AI
undetectable.ai
Undetectable AI bundles an AI text detector, an AI humanizer and an AI image detector into one account.
Make main Remove
Traffic estimated monthly website traffic
Monthly visits
—
49.3Mvisits/mo
31.4Mvisits/mo
—
MoM change
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▲ 10.8%
▼ 8.4%
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6-month growth
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-22.5%
-27.9%
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Global rank web
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#688
#1,318
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Avg. last 3 months
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46.5M
36.7M
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Bounce rate lower is better
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40%
46%
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Pages / visit
—
7.8
5.5
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Visit duration
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4m 41s
2m 52s
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Traffic sources
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● Direct 85% · ● Referral 9%
● Direct 76% · ● Referral 22%
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LanguageToolGrammarlyQuillBotUndetectable AI
015.9M31.8M47.7M63.6MGrammarly · 58.8MGrammarly · 54.5MGrammarly · 55.9MGrammarly · 55.7MGrammarly · 63.6MGrammarly · 58.3MGrammarly · 54MGrammarly · 45.8MGrammarly · 44.5MGrammarly · 49.3MQuillBot · 59.8MQuillBot · 47MQuillBot · 42.9MQuillBot · 43.5MQuillBot · 49.6MQuillBot · 48.1MQuillBot · 44.6MQuillBot · 34.3MQuillBot · 31.4M10M100MGrammarly · 58.8MGrammarly · 54.5MGrammarly · 55.9MGrammarly · 55.7MGrammarly · 63.6MGrammarly · 58.3MGrammarly · 54MGrammarly · 45.8MGrammarly · 44.5MGrammarly · 49.3MQuillBot · 59.8MQuillBot · 47MQuillBot · 42.9MQuillBot · 43.5MQuillBot · 49.6MQuillBot · 48.1MQuillBot · 44.6MQuillBot · 34.3MQuillBot · 31.4MNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Free
Freemium
Freemium
Paid
Starting price
Free
$12per month · free tier available
$19.95per month · free tier available
$5per month
Free tier
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Free trial
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API access
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–
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Plans
Free Free
Free FreePro Custom/moEnterprise Custom/mo
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10K words $5/mo20K words $9.50/mo35K words $15.75/mo50K words $21.25/mo+1 more
Capabilities input → output
Input
Text
Text
DocumentsImagesText
DocumentsImagesText
Output
Text
Text
DocumentsImagesSlidesText
DataText
Skill level
Beginner-friendly
Beginner-friendly
Beginner-friendly
Beginner-friendly
Categories
Writing & ContentAI Grammar CheckerAI RewriterAI Writing Assistants
AI Detection & SafetyWriting & ContentAI DetectorAI Grammar Checker+4 more
AI Detection & SafetyWriting & ContentAI DetectorAI Grammar Checker+5 more
AI Detection & SafetyAI DetectorAI Image DetectorHumanizer AI
Tasks what each tool can do · 0 shared · core   partial
Tasks covered
10
6
9
10
Grammar checking
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Paraphrasing
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Writing
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Detection
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Proofreading
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Plagiarism detection
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Undetectable content writing
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AI authorship detection
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–
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Content detection
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–
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Text humanization
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–
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Humanizing AI text
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–
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Image authenticity analysis
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–
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Multilingual grammar assistance
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–
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Summarizing
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–
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Audio detection
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–
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Document summarization
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–
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Dutch text correction
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–
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Edited image detection
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–
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French grammar checking
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–
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French text correction
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–
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Multilingual writing assistance
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–
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Spanish text correction
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–
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Text enhancement
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–
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Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
no ratings yet
Upvotes
▲ 0
▲ 1
▲ 2
▲ 0
Saves
0
0
0
0
Reviews
0
0
0
0
Prompts
0
0
0
0
Verified listing
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–
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Traffic figures are third-party estimates for the tool's own domain; tools sharing a domain with a bigger product are not counted. Pricing is captured from each tool's site and may lag.