GPTZero records 23,246,989 monthly visits with +32.5% month-over-month growth and Freemium, Paid pricing. Roundtable (Proof of Human) records 854 monthly visits with -60.5% growth and Contact for Pricing pricing.
AI detection and writing verification built for schools and editors
Prove every user is real — invisibly and continuously.
| Dimension / Metric | | |
|---|---|---|
| Official Domain | gptzero.me | roundtable.ai |
| Pricing Model | Freemium, Paid | Contact for Pricing |
| Monthly Visits | 23.25M (23,246,989) | 854 (854) |
| MoM Traffic Delta | +5.7M (+32.5%) | -1.31K (-60.5%) |
| Primary Market & Share | 🇺🇸 United States (54%) | 🇺🇸 United States (100%) |
| Direct Visits / mo | 7.53M | 336 |
| User Rating | 4.1 | 3.9 |
| Supported Platforms | Website | Website |
AI detection and writing verification built for schools and editors
Paste text or upload a document and get an overall AI probability score plus a sentence-by-sentence breakdown of which parts look machine-written.
Flags AI text from major model families including ChatGPT, Gemini, Claude, Llama, and others, rather than training for a single model.
A Chrome extension and Google Docs add-on bring scanning into Gmail, Docs, Classroom, and other surfaces you already work in.
Checks content for copied passages from outside sources so you can separate AI-generation questions from originality questions.
Prove every user is real — invisibly and continuously.
Proof of Human runs silently behind login and checkout flows, scoring behavior in under 200 milliseconds without CAPTCHAs or friction for real people.
Continuous behavioral models look for programmatic typing, teleporting mouse movement, jump scrolling, centered clicks and pasted text to catch bots and AI agents mid-session.
The service states it collects no PII and does no cross-site tracking, helping teams meet compliance and privacy requirements.
A single script tag with a site key and user ID is enough to begin verifying sessions, and results include an example session report with explainable signals.
Free / Open-sourceAI content detection and a full writing toolkit in one place
Free / Open-sourceAI content detection and a full writing toolkit in one place
SpecialistCombines AI detection with professional human proofreading and citation tools, but functions primarily as an editing service.
SpecialistCombines AI detection with professional human proofreading and citation tools, but functions primarily as an editing service.
Free / Open-sourcePrivacy-first bot detection and fraud prevention for the web
Free / Open-sourcePrivacy-first bot detection and fraud prevention for the web
Targeted research audiences with AI-verified data quality
Targeted research audiences with AI-verified data quality
Free / Open-sourceDetect, humanize and verify AI content in one place
Free / Open-sourceDetect, humanize and verify AI content in one place
Provides robust enterprise-grade content integrity and cross-media detection, but can be more expensive for individual users.
Provides robust enterprise-grade content integrity and cross-media detection, but can be more expensive for individual users.
Delivers strong fact-checking and comprehensive site-wide plagiarism audits, but has stricter paywalls than GPTZero.
Delivers strong fact-checking and comprehensive site-wide plagiarism audits, but has stricter paywalls than GPTZero.
Free / Open-sourceMultilingual AI detector with sentence-level insight
Free / Open-sourceMultilingual AI detector with sentence-level insight
Excels at scanning both text and images with high accuracy, but offers fewer free daily checks than GPTZero.
Excels at scanning both text and images with high accuracy, but offers fewer free daily checks than GPTZero.
Free / Open-sourceFree AI detector with sentence-level insight and a humanizer
Free / Open-sourceFree AI detector with sentence-level insight and a humanizer
Free / Open-sourceAI detector that highlights evidence, not just a score
Free / Open-sourceAI detector that highlights evidence, not just a score
Free / Open-sourceTwo minutes, one stranger, one question: human or AI?
Free / Open-sourceTwo minutes, one stranger, one question: human or AI?
