GPTZero records 23,246,989 monthly visits with +32.5% month-over-month growth and Freemium, Paid pricing. Lex records 24,323 monthly visits with -57.1% growth and Freemium pricing.
AI detection and writing verification built for schools and editors
An AI writing workspace that keeps the craft in focus
| Dimension / Metric | | |
|---|---|---|
| Official Domain | gptzero.me | lex.page |
| Pricing Model | Freemium, Paid | Freemium |
| Monthly Visits | 23.25M (23,246,989) | 24.32K (24,323) |
| MoM Traffic Delta | +5.7M (+32.5%) | -32.32K (-57.1%) |
| Primary Market & Share | 🇺🇸 United States (54%) | 🇺🇸 United States (43.1%) |
| Direct Visits / mo | 7.53M | 14.65K |
| User Rating | 4.1 | 1.8 |
| 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.
An AI writing workspace that keeps the craft in focus
Ask the built-in assistant to critique a passage, brainstorm alternatives or rewrite something, without leaving the document.
Keyboard-driven AI shortcuts find the better word, expand a bullet into prose or generate a list of ideas in place.
Threaded comments navigated by shortcut plus saved versions, so you can try a different way of saying something without losing the original.
Share a link for one-click co-editing in real time, or send a read-only link so others can simply read the finished piece.
Paraphrase, proofread and summarize text with an AI writing workspace
Paraphrase, proofread and summarize text with an AI writing workspace
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.
SpecialistCombines AI detection with robust text humanization tools, but focuses more heavily on rewriting than pure verification.
SpecialistCombines AI detection with robust text humanization tools, but focuses more heavily on rewriting than pure verification.
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.
The AI workspace where researchers read, write, and cite with every claim traceable to its source
The AI workspace where researchers read, write, and cite with every claim traceable to its source
One workspace to write, check and summarize
One workspace to write, check and summarize
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.
Write bolder, clearer prose with instant readability and grammar feedback
Write bolder, clearer prose with instant readability and grammar feedback
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.
The AI editor built for finishing books, screenplays and long-form stories
The AI editor built for finishing books, screenplays and long-form stories
