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GPTZero vs Pangram: catalog facts
GPTZero	Pangram
Freemium Free scans up to 10,000 characters, with paid upgrades for advanced features.	Freemium Free credits and three free image scans per day, with paid plans for more use.
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	Detects AI-generated and AI-assisted text Separate image detection for AI-generated pictures
AI detection is probabilistic and can misclassify human writing Free scans are limited in length	Free use is limited by credits and daily scans Detection results are probabilistic 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 October 1, 2026

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