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Smodin vs GPTZero: catalog facts
Smodin	GPTZero
Freemium Free to try, with paid plans for heavier use.	Freemium Free scans up to 10,000 characters, with paid upgrades for advanced features.
Web	Web, Browser extension
Several writing tools in one place Accepts uploaded Word, PDF and text files	Sentence-level highlighting rather than a single score Writing replay in Google Docs shows how a document was produced
AI detection scores are estimates and can be wrong Humanizer output may conflict with school or publisher rules	AI detection is probabilistic and can misclassify human writing Free scans are limited in length
Web application	Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
No account 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.