GPTZero

GPTZero checks whether text was written by an AI model such as ChatGPT. It is an AI content detector that also covers grammar, plagiarism and citations, depending on the plan you pick.

Pricing is paid and starts at $8.33 a month when billed annually at $99.96.

Essential gives you 150,000 words per month with a basic AI scan, grammar check, AI vocabulary check and a Chrome extension.

Premium is $12.99 a month on annual billing and raises the limit to 300,000 words.

It adds an advanced scan, writing feedback, a plagiarism check, and tools to source and generate citations.

Professional costs $24.99 a month on annual billing and allows 500,000 words per month, with up to 10 million words of overage.

You can scan up to 250 files at once, view results page by page, and work with a team under enterprise grade security.

Plagiarism checking only arrives at the middle tier, so the cheapest plan is really an AI scan with grammar help.

GPTZero also appears in the AI API category.