GPTZero vs QuillBot vs Undetectable AI vs Originality.AI

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

Your tool
GPTZero
vs
Competitor 1
QuillBot
Competitor 2
Undetectable AI
Competitor 3
Originality.AI
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 QuillBot
quillbot.com
Rephrase until it sounds right
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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 Originality.AI
originality.ai
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Traffic estimated monthly website traffic
Monthly visits
11Mvisits/mo
31.4Mvisits/mo
—
1.7Mvisits/mo
MoM change
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▼ 8.4%
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▼ 3.1%
6-month growth
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-27.9%
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-37.9%
Global rank web
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#1,318
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#37,307
Avg. last 3 months
11M
36.7M
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1.8M
Bounce rate lower is better
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46%
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56%
Pages / visit
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5.5
—
2.5
Visit duration
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2m 52s
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2m 31s
Traffic sources
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● Direct 76% · ● Referral 22%
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● Direct 86% · ● Referral 13%
GPTZeroQuillBotUndetectable AIOriginality.AI
014.9M29.9M44.8M59.8MGPTZero · 11MQuillBot · 59.8MQuillBot · 47MQuillBot · 42.9MQuillBot · 43.5MQuillBot · 49.6MQuillBot · 48.1MQuillBot · 44.6MQuillBot · 34.3MQuillBot · 31.4MOriginality.AI · 2.6MOriginality.AI · 2.5MOriginality.AI · 2.2MOriginality.AI · 2.2MOriginality.AI · 2.7MOriginality.AI · 2.5MOriginality.AI · 2.4MOriginality.AI · 1.9MOriginality.AI · 1.7MOriginality.AI · 1.7M1M10M100MGPTZero · 11MQuillBot · 59.8MQuillBot · 47MQuillBot · 42.9MQuillBot · 43.5MQuillBot · 49.6MQuillBot · 48.1MQuillBot · 44.6MQuillBot · 34.3MQuillBot · 31.4MOriginality.AI · 2.6MOriginality.AI · 2.5MOriginality.AI · 2.2MOriginality.AI · 2.2MOriginality.AI · 2.7MOriginality.AI · 2.5MOriginality.AI · 2.4MOriginality.AI · 1.9MOriginality.AI · 1.7MOriginality.AI · 1.7MNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Freemium
Freemium
Paid
Freemium
Starting price
$12.99per month · free tier available
$19.95per month · free tier available
$5per month
$12.95per 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
Basic FreePro $12.95/moEnterprise $136.58/mo
Capabilities input → output
Input
TextDocuments
ImagesTextDocuments
TextImagesDocuments
Web pagesTextDocuments
Output
TextData
TextSlidesImagesDocuments
TextData
DataText
Skill level
Beginner-friendly
Beginner-friendly
Beginner-friendly
Intermediate
Categories
AI Detection & SafetyAI DetectorAI Plagiarism Checker
AI Detection & SafetyWriting & ContentAI DetectorAI Grammar Checker+5 more
AI Detection & SafetyAI DetectorAI Image DetectorHumanizer AI
AI Detection & SafetyAI DetectorAI Plagiarism Checker
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
7
9
10
8
Detection
Content detection
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Plagiarism detection
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AI authorship detection
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Content authenticity verification
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Grammar checking
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Undetectable content writing
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Proofreading
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Paraphrasing
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Text humanization
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Hallucination detection
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Humanizing AI text
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Image authenticity analysis
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Summarizing
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Writing
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Audio detection
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Document summarization
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Edited image detection
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Editorial fact checking
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Fact checking
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SEO
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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
▲ 2
▲ 0
▲ 0
Saves
0
0
0
0
Reviews
0
0
0
0
Prompts
0
0
0
0
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.