GPTZero records 23,246,989 monthly visits with +32.5% month-over-month growth and Freemium, Paid pricing. TopPDF records 643 monthly visits with -90.6% growth and Freemium pricing.
AI detection and writing verification built for schools and editors
All-in-one AI PDF tools to edit, convert, compress and translate documents
| Dimension / Metric | ||
|---|---|---|
| Official Domain | gptzero.me | toppdf.co |
| Pricing Model | Freemium, Paid | Freemium |
| Monthly Visits | 23.25M (23,246,989) | 643 (643) |
| MoM Traffic Delta | +5.7M (+32.5%) | -6.17K (-90.6%) |
| Primary Market & Share | 🇺🇸 United States (54%) | 🌐 Global (—) |
| Direct Visits / mo | 7.53M | 230 |
| 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.
All-in-one AI PDF tools to edit, convert, compress and translate documents
Modify text and images directly inside a PDF and translate document content into many languages while keeping the original page layout intact.
Shrink, merge and split PDFs so large documents are easier to store, share and organise, with compression that aims to preserve visible quality.
Convert PDFs to Word, Excel, PowerPoint and JPG, and convert Word, Excel, PowerPoint, JPG and EPUB back into PDF.
An AI grammar checker that finds grammatical errors and spelling mistakes across multiple languages, plus a paraphrasing tool for fast rewriting.
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.
Free online OCR that turns any image into editable text in seconds
Free online OCR that turns any image into editable text in seconds
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.
A free, AI-powered PDF editor for every device
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.
AI-powered PDF editor for Windows, Mac and iOS
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 AI-powered PDF editor, converter and reader for every device
Free AI-powered PDF editor, converter and reader for every device
AI translation for text, images, documents and speech in 100+ languages
AI translation for text, images, documents and speech in 100+ languages
Cross-platform PDF editing with GPT-powered AI for reading, translating, and signing documents
