GPTZero vs Turnitin vs Undetectable AI vs Grammarly

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

Your tool
GPTZero
vs
Competitor 1
Turnitin
Competitor 2
Undetectable AI
Competitor 3
Grammarly
Compare
4 tools · best value per row highlighted
Your tool GPTZero
gptzero.me
Used by over 10 million teachers and students across more than 100 countries, GPTZero detects AI-generated text across major language models while providing a suite of writing verification tools
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Competitor Turnitin
turnitin.com
Turnitin is an academic integrity suite that schools, universities, and research organizations use to verify originality and deal with AI-written text.
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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 Grammarly
grammarly.com
Writing confidence that follows you everywhere
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Traffic estimated monthly website traffic
Monthly visits
11Mvisits/mo
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49.3Mvisits/mo
MoM change
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▲ 10.8%
6-month growth
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-22.5%
Global rank web
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#688
Avg. last 3 months
11M
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46.5M
Bounce rate lower is better
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40%
Pages / visit
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7.8
Visit duration
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4m 41s
Traffic sources
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● Direct 85% · ● Referral 9%
GPTZeroTurnitinUndetectable AIGrammarly
015.9M31.8M47.7M63.6MGPTZero · 11MGrammarly · 58.8MGrammarly · 54.5MGrammarly · 55.9MGrammarly · 55.7MGrammarly · 63.6MGrammarly · 58.3MGrammarly · 54MGrammarly · 45.8MGrammarly · 44.5MGrammarly · 49.3M10M100MGPTZero · 11MGrammarly · 58.8MGrammarly · 54.5MGrammarly · 55.9MGrammarly · 55.7MGrammarly · 63.6MGrammarly · 58.3MGrammarly · 54MGrammarly · 45.8MGrammarly · 44.5MGrammarly · 49.3MNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Freemium
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Paid
Freemium
Starting price
$12.99per month · free tier available
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$5per month
$12per month · free tier available
Free tier
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Free trial
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API access
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Plans
Free FreePremium $12.99/moProfessional $24.99/mo
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10K words $5/mo20K words $9.50/mo35K words $15.75/mo50K words $21.25/mo+1 more
Free FreePro Custom/moEnterprise Custom/mo
Capabilities input → output
Input
DocumentsText
DocumentsText
DocumentsImagesText
Text
Output
DataText
Data
DataText
Text
Skill level
Beginner-friendly
Beginner-friendly
Beginner-friendly
Beginner-friendly
Categories
AI Detection & SafetyAI DetectorAI Plagiarism Checker
AI Detection & SafetyAI DetectorAI Plagiarism Checker
AI Detection & SafetyAI DetectorAI Image DetectorHumanizer AI
AI Detection & SafetyWriting & ContentAI DetectorAI Grammar Checker+4 more
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
7
8
10
6
Detection
AI authorship detection
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Plagiarism detection
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Content detection
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Grammar checking
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Content authenticity verification
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Paraphrasing
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Text humanization
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Writing
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Exam cheating
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Hallucination detection
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Humanizing AI text
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Image authenticity analysis
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Proofreading
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Undetectable content writing
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Academic integrity advising
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Audio detection
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Edited image detection
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Exam grading
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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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▲ 1
Saves
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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.