Grammarly vs GPTZero vs Turnitin vs Undetectable AI

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

Your tool
Grammarly
vs
Competitor 1
GPTZero
Competitor 2
Turnitin
Competitor 3
Undetectable AI
Compare
4 tools · best value per row highlighted
Your tool Grammarly
grammarly.com
Writing confidence that follows you everywhere
Remove
Competitor 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
Make main Remove
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.
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
11Mvisits/mo
—
—
MoM change
▲ 10.8%
—
—
—
6-month growth
-22.5%
—
—
—
Global rank web
#688
—
—
—
Avg. last 3 months
46.5M
11M
—
—
Bounce rate lower is better
40%
—
—
—
Pages / visit
7.8
—
—
—
Visit duration
4m 41s
—
—
—
Traffic sources
● Direct 85% · ● Referral 9%
—
—
—
GrammarlyGPTZeroTurnitinUndetectable AI
015.9M31.8M47.7M63.6MGrammarly · 58.8MGrammarly · 54.5MGrammarly · 55.9MGrammarly · 55.7MGrammarly · 63.6MGrammarly · 58.3MGrammarly · 54MGrammarly · 45.8MGrammarly · 44.5MGrammarly · 49.3MGPTZero · 11M10M100MGrammarly · 58.8MGrammarly · 54.5MGrammarly · 55.9MGrammarly · 55.7MGrammarly · 63.6MGrammarly · 58.3MGrammarly · 54MGrammarly · 45.8MGrammarly · 44.5MGrammarly · 49.3MGPTZero · 11MNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Freemium
Freemium
—
Paid
Starting price
$12per month · free tier available
$12.99per month · free tier available
—
$5per month
Free tier
–
–
Free trial
–
–
API access
–
–
Plans
Free FreePro Custom/moEnterprise Custom/mo
Free FreePremium $12.99/moProfessional $24.99/mo
—
10K words $5/mo20K words $9.50/mo35K words $15.75/mo50K words $21.25/mo+1 more
Capabilities input → output
Input
Text
DocumentsText
DocumentsText
DocumentsImagesText
Output
Text
DataText
Data
DataText
Skill level
Beginner-friendly
Beginner-friendly
Beginner-friendly
Beginner-friendly
Categories
AI Detection & SafetyWriting & ContentAI DetectorAI Grammar Checker+4 more
AI Detection & SafetyAI DetectorAI Plagiarism Checker
AI Detection & SafetyAI DetectorAI Plagiarism Checker
AI Detection & SafetyAI DetectorAI Image DetectorHumanizer AI
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
6
7
8
10
Detection
AI authorship detection
–
Plagiarism detection
–
Content detection
–
Grammar checking
–
–
Content authenticity verification
–
–
Paraphrasing
–
–
–
Text humanization
–
–
–
Writing
–
–
–
Exam cheating
–
–
–
Hallucination detection
–
–
–
Humanizing AI text
–
–
–
Image authenticity analysis
–
–
–
Proofreading
–
–
–
Undetectable content writing
–
–
–
Academic integrity advising
–
–
–
Audio detection
–
–
–
Edited image detection
–
–
–
Exam grading
–
–
–
Text enhancement
–
–
–
Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
no ratings yet
Upvotes
▲ 1
▲ 1
▲ 0
▲ 0
Saves
0
0
0
0
Reviews
0
0
0
0
Prompts
0
0
0
0
Verified listing
–
–
–
–

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.