
Share and access study materials worldwide — with AI study tools built in
Share and access study materials worldwide — with AI study tools built in
GPTZero records 23,246,989 monthly visits with +32.5% month-over-month growth and Freemium, Paid pricing. TrustDoc records 74 monthly visits with -97.1% growth and Freemium, Paid pricing.

AI-powered document scoring, evaluation and verification
| Dimension / Metric | ![]() | |
|---|---|---|
| Official Domain | gptzero.me | trustdoc.us |
| Pricing Model | Freemium, Paid | Freemium, Paid |
| Monthly Visits | 23.25M (23,246,989) | 74 (74) |
| MoM Traffic Delta | +5.7M (+32.5%) | -2.49K (-97.1%) |
| Primary Market & Share | 🇺🇸 United States (54%) | 🇺🇸 United States (100%) |
| Direct Visits / mo | 7.53M | 29 |
| User Rating | 4.1 | 3.8 |
| 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.

AI-powered document scoring, evaluation and verification
Upload, analyze, and retrieve documents in a few clicks, with AI reviewing each file against your approved headers and templates instead of relying on manual spot-checks.
Generate consistent numerical scores for every submission so reviewers and stakeholders can compare documents objectively rather than relying on gut feel.
AI writes the reasoning behind each score, giving you an audit trail that explains why a document passed or fell short, which is especially valuable in compliance contexts.
Standard and premium plans condense long documents into digestible summaries, so reviewers can triage a large batch quickly before reading in depth.

Share and access study materials worldwide — with AI study tools built in
Share and access study materials worldwide — with AI study tools built in
Offers broad multilingual AI detection and text humanization, but lacks GPTZero's detailed deep-scan reporting features.
Offers broad multilingual AI detection and text humanization, but lacks GPTZero's detailed deep-scan reporting features.

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.
Detect, humanize and verify AI content in one place
Detect, 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.

All-in-one online PDF editor with AI helpers for reading, summarizing, and generating documents
All-in-one online PDF editor with AI helpers for reading, summarizing, and generating documents

Provides detailed sentence-level analysis for multilingual text, but lacks GPTZero's broad academic brand recognition.
Provides detailed sentence-level analysis for multilingual text, but lacks GPTZero's broad academic brand recognition.

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.
AI detector that highlights evidence, not just a score
AI detector that highlights evidence, not just a score

SpecialistTailors detection specifically for academic institutions and LMS integrations, but is less optimized for casual web users.
SpecialistTailors detection specifically for academic institutions and LMS integrations, but is less optimized for casual web users.
SpecialistHumanize AI text and check it against AI detectors
SpecialistHumanize AI text and check it against AI detectors