Grammarly vs LanguageTool vs Undetectable AI vs StealthGPT

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

Your tool
Grammarly
vs
Competitor 1
LanguageTool
Competitor 2
Undetectable AI
Competitor 3
StealthGPT
Compare
4 tools · best value per row highlighted
Your tool Grammarly
grammarly.com
Writing confidence that follows you everywhere
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Competitor 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 Undetectable AI
undetectable.ai
Undetectable AI bundles an AI text detector, an AI humanizer and an AI image detector into one account.
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Competitor StealthGPT
stealthgpt.ai
StealthGPT is an AI humanizer and writing assistant that rewrites generated text so it reads naturally and avoids detector flags.
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Traffic estimated monthly website traffic
Monthly visits
49.3Mvisits/mo
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MoM change
▲ 10.8%
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6-month growth
-22.5%
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Global rank web
#688
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Avg. last 3 months
46.5M
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Bounce rate lower is better
40%
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Pages / visit
7.8
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Visit duration
4m 41s
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Traffic sources
● Direct 85% · ● Referral 9%
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GrammarlyLanguageToolUndetectable AIStealthGPT
015.9M31.8M47.7M63.6MGrammarly · 58.8MGrammarly · 54.5MGrammarly · 55.9MGrammarly · 55.7MGrammarly · 63.6MGrammarly · 58.3MGrammarly · 54MGrammarly · 45.8MGrammarly · 44.5MGrammarly · 49.3M10M100MGrammarly · 58.8MGrammarly · 54.5MGrammarly · 55.9MGrammarly · 55.7MGrammarly · 63.6MGrammarly · 58.3MGrammarly · 54MGrammarly · 45.8MGrammarly · 44.5MGrammarly · 49.3MNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Freemium
Free
Paid
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Starting price
$12per month · free tier available
Free
$5per month
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Free tier
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Free trial
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API access
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Plans
Free FreePro Custom/moEnterprise Custom/mo
Free Free
10K words $5/mo20K words $9.50/mo35K words $15.75/mo50K words $21.25/mo+1 more
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Capabilities input → output
Input
Text
Text
DocumentsImagesText
Text
Output
Text
Text
DataText
Text
Skill level
Beginner-friendly
Beginner-friendly
Beginner-friendly
Beginner-friendly
Categories
AI Detection & SafetyWriting & ContentAI DetectorAI Grammar Checker+4 more
Writing & ContentAI Grammar CheckerAI RewriterAI Writing Assistants
AI Detection & SafetyAI DetectorAI Image DetectorHumanizer AI
AI Detection & SafetyAI DetectorHumanizer AI
Tasks what each tool can do · 0 shared · core   partial
Tasks covered
6
10
10
9
Paraphrasing
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Detection
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Writing
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Grammar checking
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Text humanization
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Humanizing AI text
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Undetectable content writing
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Content detection
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Proofreading
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AI authorship detection
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Bypassing AI content detection
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Image authenticity analysis
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Multilingual grammar assistance
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Plagiarism detection
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Audio detection
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Citation formatting
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Dutch text correction
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Edited image detection
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French grammar checking
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French text correction
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Multilingual writing assistance
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Spanish text correction
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Text enhancement
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Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
no ratings yet
Upvotes
▲ 1
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Saves
0
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Reviews
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Prompts
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Verified listing
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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.