Academic AI Detector

An academic AI detector analyzes writing for patterns associated with AI-generated text. You can use it to review essays, assignments, research papers, and thesis chapters. The score is a signal to investigate alongside the writing process and supporting sources; it does not establish who wrote a document.

In our September 2026 benchmark, tropa-3 detected 95.2% of raw AI text from current models and 57.7% of humanized AI text, and flagged none of the 252 human texts it was compared on. On 239,490 held-out human texts it flagged 0.10%. The AI texts come from the same models and humanizers our detector was trained on, so treat these figures as an upper bound. The linked research explains the samples and scoring thresholds so you can interpret each figure in context.

tropa-3 had the highest raw-AI detection rate of the four tools in our September 2026 benchmark: 95.6%, versus 61.6% for GPTZero, 44.0% for Pangram and 21.4% for ZeroGPT. On 247 human texts, tropa-3, GPTZero and Pangram flagged none and ZeroGPT flagged 2. The comparison counts confident AI labels, excluding mixed labels. The AI texts come from models our detector was trained on, so this is a result for that sample and scoring rule. The linked benchmark provides the full methodology.

Yes, you can check German essays, Hausarbeiten, research papers, and thesis chapters in the original language. In our August 31, 2026 evaluation of tropa-2, our previous model, all 300 German texts generated with GPT-4o and GPT-5.5 scored at least 70 (likely AI), and 286 scored at least 90 (AI-generated). At the 90-point threshold, 4 of 15,881 German reference web texts were flagged. These separate samples describe raw AI text and pre-2022 web writing, not a guarantee for every German academic document.

You can submit text in English, German, French, Spanish, Italian, Portuguese, and Dutch. We publish AI-detection results for English and a separate German sample. For French, Spanish, Italian, Portuguese, and Dutch, the language table on this page reports false positives on pre-2022 reference web texts; it does not establish an AI-detection rate for those languages. Check writing in its original language and review the result with someone familiar with the text.

Check the original passage when your question concerns the original writing. Translation changes the wording and sentence structure, so a score on a translation describes that translation. It does not establish how the original paper was written. For a document containing several languages, reviewing passages separately helps keep the result tied to the text you want to assess.

Yes. Paste a passage into the text checker, or sign in to upload a PDF or DOCX up to 10 MB. Document analysis extracts the text for checking and generates a report. If you also want feedback on argumentation, structure, and citations, use the separate AI Thesis Checker.

You can try text detection on this page without an account. Further checks use the existing account and credit system. Document uploads require sign-in and sufficient credits, and full sentence-level deep analysis requires a subscription. See the pricing page for current plans.

Use a continuous passage of at least 100 words where possible, and include more of the writing when available. A title, a short abstract, or a few isolated sentences gives the detector less context. Review the surrounding argument and any quoted material when interpreting the result.

No. AI detection looks for patterns associated with generated writing. Plagiarism checking compares text against existing sources. This tool does not provide a source-matching plagiarism check, and a low AI score does not confirm originality or citation accuracy.

tropa-3 can identify some AI-generated writing after editing and can show a “possibly humanized” hint when that signal is present. In our September 2026 benchmark it detected 57.7% of text processed by six humanizer tools and 61.7% of paraphrased AI text. Paraphrasing, translation, and substantial rewriting can change the signal, so the absence of a flag does not establish that a passage was written without AI.

No. Both false positives and false negatives are possible. Review drafts, source notes, revision history, and the student’s explanation of their work. Use the result as one input to your institution’s review process, never as the sole basis for a grade or misconduct decision.