Is it AI? Is it plagiarized?
Is it even real?
PhantomDetect checks any essay for AI-generated text, plagiarism, AI-sounding vocabulary, and fake citations — in one scan, before your teacher does.
No credit card required · Detects ChatGPT, Claude, Gemini & more
Detects writing from every major AI model
Free instant check — vocabulary & citations
Paste your text below. No signup needed for this part.
Four checks. One scan.
Everything a student needs to know before hitting submit.
AI Detection
See what percentage of a document is likely AI-generated, with sentence-level highlighting showing exactly where.
Powered by Winston AI, trained on ChatGPT, Claude, Gemini & more.
Plagiarism Check
Find matches against online sources, with the exact source URL and matched text — before your teacher does.
Runs as a separate check so you only pay for what you need.
AI Vocabulary Flags
Spot the words and phrases — "delve," "tapestry," "in today's world" — that read as AI-written, even in edited text.
Free, instant, no signup required.
Hallucination Check
Extracts every citation in your paper and verifies it against real academic databases, flagging invented sources.
Most AI detectors don't offer this at all.
How it works
Paste or upload
Paste your text or upload a PDF, DOCX, or TXT file — no formatting cleanup needed.
Choose your scan
Run a free vocabulary + citation check instantly, or sign up for a full AI + plagiarism scan.
Get one clear report
See AI likelihood, plagiarism matches, flagged vocabulary, and unresolved citations — side by side.
Check your own work before you submit it
Most students don't find out their essay reads as AI-generated until after it's graded. PhantomDetect lets you see what your teacher's AI detector will see — and fix it — before you turn anything in.
Educators use the same report to give students a fair, explainable reason for a flag — not just a percentage.
- Catch AI-sounding phrasing your professor already recognizes, even in text you wrote and then polished with AI.
- Verify every citation before submission — fake references are one of the fastest ways to get flagged for academic dishonesty.
- Know your plagiarism scoreagainst public sources before your school's own checker runs it.
Why not just use a typical AI detector?
Most AI detectors — including well-known names like Originality.ai and GPTZero — stop at AI detection and plagiarism. PhantomDetect also catches AI-sounding vocabulary and fabricated citations.
| Feature | PhantomDetect | Typical AI detector |
|---|---|---|
| AI detection | ✓ | ✓ |
| Plagiarism check | ✓ | ✓ |
| AI-sounding vocabulary flags | ✓ | ✕ |
| Hallucination / fake citation check | ✓ | ✕ |
| Free instant check, no signup | ✓ | Rarely |
| Built for individual students | ✓ | Sometimes |
What is an AI detector and how does it work?
An AI detector is a tool that estimates the probability that a piece of text was written by a large language model like ChatGPT, Claude, or Gemini rather than a human. Modern detectors, including the one behind PhantomDetect, use a trained classifier model rather than simple heuristics — it compares patterns in your writing against known human and AI text to produce a confidence score, plus sentence-level highlighting showing which parts look most AI-written.
Why do AI writing tools invent fake citations?
Large language models generate text by predicting plausible-sounding words, not by looking anything up — so when asked for a source, they can produce a citation that reads perfectly (real-sounding author, journal, and year) but doesn't correspond to any real publication. This is called a hallucinated citation. PhantomDetect's citation checker extracts every reference in your document and verifies it against CrossRef, a real academic database, flagging any that can't be found.
What are the words that give away AI writing?
Certain words and phrases — "delve," "tapestry," "boasts," "in today's world," "it is important to note" — show up far more often in AI-generated text than in typical human writing, even after a human edits the output. PhantomDetect's vocabulary flagger highlights these phrases instantly, for free, without needing to run a full AI-detection scan.
Is AI detection accurate?
No AI detector, including PhantomDetect, is 100% accurate — treat any AI-detection score as a probability signal rather than proof. Accuracy is lowest on very short text (under roughly 300 characters) and can vary by writing style. PhantomDetect flags this directly in the report rather than presenting a confident-sounding number regardless of input length.
Frequently asked questions
What does PhantomDetect check for?+
PhantomDetect checks a piece of writing for four things in one scan: AI-generated text, plagiarism against online sources, AI-sounding vocabulary (words like "delve" or "tapestry" that show up disproportionately in AI writing), and fake or unverifiable citations. Most AI detectors only check one or two of these.
How accurate is PhantomDetect's AI detector?+
PhantomDetect's AI detection is powered by Winston AI, which reports high accuracy across ChatGPT, Claude, Gemini, and other major models. No AI detector is 100% accurate — treat the score as a probability, not proof, especially on very short text.
Can PhantomDetect detect ChatGPT, Claude, and Gemini?+
Yes. PhantomDetect's AI detector is trained to recognize text generated by ChatGPT, Claude, Gemini, and other major large language models, not just one.
What is a hallucination or fake citation checker?+
A hallucination checker extracts the citations and references in a document and verifies each one against real academic databases (CrossRef, Semantic Scholar). AI writing tools frequently invent citations that sound real but don't exist — PhantomDetect flags exactly which ones can't be verified.
Is PhantomDetect free?+
Yes. New accounts get a free word allowance to try AI detection, plagiarism checking, vocabulary flagging, and citation verification with no credit card required. Paid plans unlock a larger monthly word allowance.
Will my essay be stored or shared?+
No. PhantomDetect scans your text to generate a report and does not sell, publish, or share submitted writing with third parties.
What file types can I upload?+
You can paste text directly or upload a PDF, DOCX, or TXT file. PhantomDetect extracts the text automatically before scanning.
Does PhantomDetect check plagiarism separately from AI detection?+
Yes. AI detection and plagiarism checking are separate checks that run independently, so you can choose an AI-only scan or a full scan that includes both.
Know before you submit.
Free vocabulary and citation checks with no signup. Full AI and plagiarism detection with a free account.
Check your writing free