Winston AI detects ChatGPT, Claude and Gemini text, plus plagiarism and AI images. Free 14-day trial; paid plans from $10/month billed annually.
Researched and fact-checked by Bartu Cavusoglu · Updated October 26, 2026
Winston AI is a web-based AI content detector and plagiarism checker. It estimates whether a piece of text was written by a person or generated by a model such as ChatGPT, Claude or Google Gemini. The company says more than 10 million users rely on it.
Beyond text, the product line includes AI image detection, writing feedback, a fact checker, an essay grader, a grammar checker, a citation generator, a readability score checker and HUMN-1 website certification. Winston AI also describes its latest detection model as Winston 5.0.
The site frames the product around three audiences: education, SEO and publishing, and individual writers. Accuracy and benchmark figures on the site are the company's own claims.
Users create an account, then paste text into a quick scan box or upload files in .docx, .png or .jpg format. OCR technology extracts text from scanned documents, pictures and handwriting, so the same workflow covers printed and handwritten material.
Results arrive in seconds. The detector gives a score from 0 to 100 showing the odds that the text is human or AI generated, and an AI prediction map adds a color-coded, sentence-by-sentence assessment. Users can switch on the plagiarism checker to scan the same text for copied content.
Reports can be printed or shared as PDFs. The company says the model uses natural language processing, machine learning and deep learning, is trained on human-reviewed data to limit false positives, and is updated weekly.
The core feature is AI text detection across ChatGPT, Claude, Google Gemini, LLAMA and other models, with support for 14 languages on the homepage list, including English, French, Spanish, German, Portuguese and Simplified Chinese. The AI prediction map shows which passages drive the score.
Advanced plagiarism detection highlights matches and sources and helps manage citations. The AI image detector targets images from tools such as Midjourney, DALL-E, Stable Diffusion, Adobe Firefly and Nano Banana, and higher tiers list forensic details such as C2PA, Exif and IPTC.
Other capabilities include shareable PDF reports, writing feedback, a readability score, team invitations, top-up credits and HUMN-1 website certification. APIs exist for AI content detection, image detection and plagiarism checking. The company states it is GDPR compliant and does not use content to improve its models.
Winston AI is an AI content detector and plagiarism checker. It estimates whether text was written by a human or an AI model such as ChatGPT, Claude or Google Gemini, and it also detects AI-generated images.
Paid plans are Essential at $18/month, Advanced at $29/month and Elite at $49/month on monthly billing. Annual billing lowers these to $10, $16 and $26 per month, charged as $60, $96 and $156 per year. Enterprise pricing is custom.
Yes. The Free plan gives 2,000 credits over a 14-day trial, and the site says no credit card is required to get started.
The company says it detects ChatGPT, Claude, Google Gemini, LLAMA and other known models, and that its algorithms are updated weekly. Its image detector covers tools such as Midjourney, DALL-E, Stable Diffusion, Adobe Firefly and Nano Banana.
The site lists a Chrome extension, Google Classroom, WordPress, Zapier and an API. APIs are available for AI content detection, AI image detection and plagiarism checking.
Yes, you can cancel from the billing section of your account, and cancellation takes effect at the end of the current paid term. Annual plans cannot be canceled during the plan term.
The company states it is GDPR compliant and that submitted content is not used to improve its models. Payments are processed by Stripe, and the company says it does not store sensitive payment information.
It suits educators checking academic integrity, publishers and SEO teams reviewing content, and writers who want an originality check before publishing. Organizations needing custom features can contact the sales team.