Detector Humanizer Plagiarism Pricing FAQ
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Live — Trusted by 2M+ students

Know exactly
what's AI.

Detect AI-generated text, humanize flagged content, and submit with total confidence — in seconds.

AI

Analyzing patterns...

✦GPTZero compatible✦ChatGPT detection✦Claude detection✦Gemini detection✦Turnitin ready✦98% accuracy✦2M+ texts analyzed✦GPTZero compatible✦ChatGPT detection✦Claude detection✦Gemini detection✦Turnitin ready✦98% accuracy✦2M+ texts analyzed
2M+
Texts analyzed
98%
Detection accuracy
4.5★
Student rating
How it works
Three steps. Total clarity.
STEP 01

Paste your text

Copy any essay, thesis, or article and paste it into Vex.AI. We support all major languages — English, Russian, Spanish, German, French, Turkish and more. No formatting required, just raw text.

STEP 02

Get your AI score

Our multi-layer algorithm analyzes sentence entropy, writing style, burstiness and vocabulary patterns to give you a precise AI probability score. Results in under 3 seconds, with word-level highlighting showing exactly which parts triggered the detector.

STEP 03

Humanize & submit

One click rewrites flagged sentences so your text sounds completely natural and human. Our humanizer preserves your original meaning while removing AI patterns. Tested to pass GPTZero, Turnitin, and all major academic detectors.

Features
Everything built in.

Detect any AI model

98% accuracy

Recognizes text from ChatGPT, GPT-4, Claude, Gemini, DeepSeek, and every major writing tool.

ChatGPT Claude Gemini DeepSeek +12 more
4.9
RISK SCORE

Academic AI score

See the exact probability your university would flag your text — before you submit it.

Turnitin · iThenticate · GPTZero

Instant rewriting

Our humanizer rewrites flagged text so it passes any AI detector — naturally, not robotically.

BEFORE 87% AI
AFTER 3% AI ✓
FREE

Plagiarism included

Every check automatically scans billions of web pages for copied content, at no extra cost.

1B+
Sources
99%
Accuracy
Testimonials
Loved by students.

Join 2M+ students worldwide

★★★★★
"Passed my professor's GPTZero check with zero flags."

I was skeptical at first, but Vex.AI caught AI-written sections in my research paper I had completely missed. The score breakdown tells you exactly where the problems are — not just a vague percentage. Fixed everything before submission.

A
Amanda R.
University student, USA
★★★★★

"Saved me twice in one semester. I use AI to brainstorm, then rewrite manually — but my phrasing still gets flagged. Vex.AI shows me exactly which sentences look robotic. Honestly couldn't submit without checking here first."

✓ Used weekly ✓ Humanizer
K
Kevin P.
Graduate student, UK
★★★★★

"As a PhD candidate I needed a detector that doesn't give false positives on technical writing. Vex.AI handles academic tone really well — it found subtle AI patterns in my literature review I hadn't noticed at all."

ACCURACY
9.5/10
EASE OF USE
10/10
M
Maria S.
PhD candidate, Germany
★★★★★

"Other detectors gave me a 90% AI score on text I wrote myself. Vex.AI is actually calibrated well. Results are instant and the UI takes 30 seconds to learn. Best $9.99 I've spent this semester."

87%
before
→
3%
after humanizer
J
James T.
College student, Canada
AI Humanizer

Make it sound human.

Paste AI-generated text and get a natural, undetectable version in seconds.

Under 3 seconds
Passes GPTZero
Passes Turnitin
Never stored
75%
Avg AI score reduction
<3s
Processing time
12+
AI patterns removed
Plagiarism Checker

Is it original?

Check your text against billions of sources. Get results in seconds.

Billions of sources
Academic databases
Instant results
1B+
Sources indexed
99%
Match accuracy
Free
With every scan
Simple pricing

Plans for every
deadline.

Start free, upgrade anytime. Cancel whenever.

7-DAY TRIAL

Starter

For quickly exploring before committing to a full plan.

$2
then $19.99/month
  • 50 detections
  • Basic humanizer
  • Plagiarism check
MOST POPULAR

Monthly

For essays, deadlines, and regular academic work.

$9.99$19.99
per month
  • Unlimited detections
  • Advanced humanizer
  • Plagiarism check
  • Priority support
  • History saved
BEST VALUE

Annual

For students who write all year and want to save max.

$4.99$19.99
per month, billed annually
  • Everything in Monthly
  • 75% savings vs monthly
  • Early access to features
FAQ
Got questions?
Here's the truth.
What is an AI detector?+
An AI detector analyzes statistical and linguistic patterns in text to determine the probability that it was generated by an AI model. It looks at sentence entropy, perplexity, burstiness, and vocabulary distribution — signals that differ measurably between human writers and language models. Vex.AI combines multiple detection layers to give you a reliable score even on edited or paraphrased AI text.
How accurate is Vex.AI?+
Our detector achieves 4.5/5 accuracy in student beta testing across 50,000+ samples, cross-validated against GPTZero and Originality.ai. False positive rates on genuine human writing are kept below 4%. For best results, paste at least 150 words — shorter texts have higher variance in any detector. We update our models regularly to stay current with new AI writing tools.
Can it detect ChatGPT and Claude?+
Yes. We detect patterns from ChatGPT (3.5 and 4), GPT-4o, Claude (all versions), Gemini, DeepSeek, Mistral, LLaMA, and most major AI writing assistants. Each model has distinct statistical fingerprints. We also detect lightly edited AI text — when someone runs output through paraphrasers like Quillbot. The hardest cases are heavily rewritten AI text mixed with original writing, which we handle better than most tools.
Is using AI always cheating?+
No — and this is an important distinction. Policies vary significantly by institution, course, and even assignment. Many universities explicitly allow AI for brainstorming, outlining, or grammar checking with proper disclosure. Some ban it entirely. Others are still forming policies. Vex.AI helps you understand how your text will be perceived by automated detectors, so you can make an informed decision before you submit.
Is my text stored?+
Your raw text is never sold, shared, or used to train any models — period. If you're logged in, a brief scan record is saved to your personal history so you can track your work. You can delete your history at any time from your account page. Anonymous scans leave no trace at all.
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Endpoints
POST /v1/detect
Detect AI probability in text
POST /v1/humanize
Rewrite AI text to sound human
POST /v1/plagiarism
Check text for plagiarism
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