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GPTZero vs Originality.ai: catalog facts
GPTZero	Originality.ai
Freemium Free scans up to 10,000 characters, with paid upgrades for advanced features.	Freemium Three free AI scans per day, with paid plans for more.
Web, Browser extension	Web, Browser extension
Sentence-level highlighting rather than a single score Writing replay in Google Docs shows how a document was produced	AI detection plus plagiarism, readability and fact checks Chrome and Firefox extensions with Google Docs support
AI detection is probabilistic and can misclassify human writing Free scans are limited in length	Free tier is limited to three scans a day AI detection results are estimates and can be wrong
Web application, Browser extension	Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 26, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.