GPTZero Free plan (AI text detection, 10,000 words per month, 1 Advanced Scan)

Free plan at 0 USD: 10,000 words per month, Basic AI Scan, 1 Advanced Scan, and 5 AI Highlights in the Chrome extension; the per-scan limit is 10,000 characters

Official pricing page (rendered), Free card verbatim: "FREE", "$0", "10,000 words per month", "Basic AI Scan", "1 Free Advanced Scan", "5 Free AI Highlights in Chrome Extension". In the comparison table, the "Words per month" row shows 10,000 for Free, 300,000 for Premium and 500,000 for Professional; the "Character limit per scan" row shows 10,000 for Free, 50,000 for Premium and 150,000 for Professional. Only Premium (12.99 USD per month, billed annually) includes "Advanced AI Scan", "Multilingual AI detection" and "Download AI reports".

⚠️The Free plan covers only the basic scan and 1 Advanced Scan; multilingual detection and report downloads need Premium. The pricing page does not state the sign-up method, so email is listed. Detection results are only a probabilistic judgment and should not be the sole basis for a decision. Access from mainland China was not tested.