EchoMark records 8,044 monthly visits with +10.6% month-over-month growth and Freemium, Contact for Pricing pricing. GPTZero records 23,246,989 monthly visits with +32.5% growth and Freemium, Paid pricing.
Invisible forensic watermarks that identify who leaked your data
AI detection and writing verification built for schools and editors
| Dimension / Metric | | |
|---|---|---|
| Official Domain | echomark.com | gptzero.me |
| Pricing Model | Freemium, Contact for Pricing | Freemium, Paid |
| Monthly Visits | 8.04K (8,044) | 23.25M (23,246,989) |
| MoM Traffic Delta | +772 (+10.6%) | +5.7M (+32.5%) |
| Primary Market & Share | 🇺🇸 United States (100%) | 🇺🇸 United States (54%) |
| Direct Visits / mo | 3.19K | 7.53M |
| User Rating | 4.3 | 4.1 |
| Supported Platforms | Website | Website |
Invisible forensic watermarks that identify who leaked your data
Each recipient's copy of an email, document or image carries a different hidden mark, so a single leaked artifact points to one person.
The Luma image mark is engineered to survive printouts, photocopies, mobile photos and compression, where metadata-based tagging fails.
Marks everything shown on a display, covering any app or file type including browsers, collaboration tools and AI assistants.
Upload a leaked file, screenshot or photo and get back the source recipient with a confidence score and chain-of-custody documentation.
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.
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.
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
SpecialistCheck plagiarism, detect AI text and polish your writing in one place
SpecialistCheck plagiarism, detect AI text and polish your writing in one place
Free AI content detector that flags machine-written text and helps you rewrite it
Free AI content detector that flags machine-written text and helps you rewrite it
