GPTZero built its name in classrooms, catching AI-written essays for teachers. Did AI Write It is built for the professional draft going out under your name, and checks plagiarism and facts on the same paste, not just AI-likelihood.
Sign up freeSame draft, one paste
All three from the report GPTZero's AI-detection score alone can't show.
Started as, and still leans toward, a tool for teachers checking whether a student wrote their own essay.
Built for the marketing copy, LinkedIn post, or report you are about to send, not for grading homework.
Did AI Write It
One Winston-verified score per check, with every sentence flagged and reasoned individually.
GPTZero
A per-document score plus a sentence-level burstiness breakdown, tuned for catching AI-written essays.
Did AI Write It
Built in. The same paste runs a plagiarism scan and a claim-by-claim fact check, no second tool.
GPTZero
Plagiarism scanning is available as a separate add-on. There is no fact-checking.
Did AI Write It
2,000 words a month free, no card required, then flat monthly plans starting at $9.
GPTZero
Offers a free tier with a monthly word cap, plus paid Individual, Pro, and Team plans. Confirm current limits and pricing at gptzero.me.
Neither tool is certain on every input. Did AI Write It scores every check against Winston's real detection model rather than a heuristic, and shows the reasoning behind every flagged sentence so you can judge the call yourself.
Yes. Running a draft through more than one detector is a reasonable way to build confidence before a piece goes out, especially on borderline scores.
Yes. The homepage runs a free instant scan with no account, and a free signed-in plan includes 2,000 words a month across AI detection, plagiarism, and fact-checking.
Paste your draft and get an AI-detection, plagiarism, and fact-check score in one report.
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