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Polygraf AI

Use this AI detector to check content for plagiarism, copyright issues, and other writing flaws

Sold out

With all these AI tools churning out full essays, plagiarism checks have become a lot trickier. (“Your last document was just a screenshot. Now you’re formatting citations??”)

As AI evolves, so do its obvious tells, making it harder to know what’s original without turning content review into a full-time job.

If only you had an AI-powered content detector that could instantly spot AI authors, plagiarism, and other writing flaws in any content.

Meet Polygraf AI.

TL;DR

too long didn't read
Instantly detect AI-generated content, plagiarized text, and even edits made with Grammarly
Get deeper content insights with AI highlighting and writing analysis

At-a-glance

Alternative to

Allows Existing Accounts

Overview

Polygraf AI lets you instantly detect AI authorship, plagiarism, and edits like Grammarly to maintain content authenticity.

Spot AI-generated content

Whether you’re grading students or working with freelance talent, Polygraf AI makes it easy to analyze content for AI authorship and assistance.

  • Accurately identify content written by ChatGPT, Gemini, Claude, and other LLMs
  • Determine if content was edited with AI tools like Grammarly
  • Distinguish between human-generated and AI-generated or AI-modified content, with confidence scores between 0% and 100%

AI detector

Check if your content was generated or modified by AI, with a confidence score for easy comparisons.

Pinpoint exactly which parts are AI-generated

Polygraf AI comes with easy-to-use dashboards and clear scores, so you can uncover the true author behind every single line.

  • View a color-coded breakdown to see what’s been written by a person, AI-generated, or AI-modified in one piece
  • Detect intentional and unintentional text edits aimed to deceive AI models, like empty spaces between words and grammatical errors

AI highlighter

Highlight AI-generated text and spot altered content instantly.

Steer clear of copyright issues

On top of that, this content detector also flags copyright issues, helping you catch traditional plagiarism on the same interface.

  • Detect the source of any content, with URLs and exact sentence or phrase matches
  • Trace machine-generated text back to the source material used to train AI models

Copyright detector

Flag copied content and trace it back to the original source.

Plus, Polygraf AI helps you take your writing to the next level, so you don’t have to rely on AI quick-fixes to polish your tone, fix grammar, or fake clarity.

  • Get insights into your writing structure, including readability, vocabulary richness, average sentence length, and average word length
  • Check out your team’s writing stats so you know exactly what to improve

Writing analysis

Measure readability, vocabulary, and flow to strengthen your writing skills.

Polygraf AI has everything you need to verify content authenticity, flag plagiarism, and sharpen your writing—all on one powerful platform.

Spot AI-generated content with confidence.

Get Polygraf AI at its lowest price!

Polygraf AI

Polygraf AI

Polygraf.ai
FoundedFounded
March 2023
HeadquartersHeadquarters
Austin, TX
Company sizeCompany size
11-50 employees
Product stageProduct stage
Expansion
Financial stageFinancial stage
Seed
Verified by Persona

In addition to our internal vetting process, we use Persona, to validate each company and founder's identity. Learn more

Updates from Polygraf AI

Company and product FAQs

Posted May 8, 2025

First post from founder

Posted May 8, 2025

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Questions
Reviews

Questions & Reviews

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Showing 5 of 30 questions

Q: Free trial review

It's not bad, I like the source detector. The AI detector also does it's job somewhat ok-ish.

I did 3 ai detection, about 500 words and 3000 characters each. They used up around 600 to around 500 credits for the detection. For the first one, it was fully AI generated by ChatGPT, I got a 93.70% confirmation rate, and source detector was OpenAI, no questions there. For the second one, I changed it and added mimimal human text, I got a 72.10% AI generated. Again, no issues and works perfectly. But for the last test, I used an AI humanizer tool and immediately, the tool put it as 11.95% AI generated. This was a huge jump so I think the devs might have to work a bit on that. But again, the tool is good enough to use when you need a "quick is this AI check" before you submit something w/o the need to purchase premium plans of GPTZero.

J_HJun 17, 2025
See detail
Founder Team
Vignesh_PolygrafAI

Vignesh_PolygrafAI

Jun 17, 2025

A: Thanks for the detailed review! Our models are continuously evolving to keep pace with new humanizers (which also evolve) so you will see improvements on that front. Again, thanks for considering Polygraf and giving us a shot!

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Q: Bug in my profile settings

When going into your account settings-> profile and selecting the "which category best describes you", this bug appears.

Something went wrong! Show error:

right-hand side of 'in' should be an object, got null

"How can I resolve this issue?" (Apologies for this question, the sumo modbot now requires these questions)

J_HJun 17, 2025
See detail
Founder Team
Vignesh_PolygrafAI

Vignesh_PolygrafAI

Jun 17, 2025

A: Thanks for bringing this to our attention - our engineering team is looking into the issue and we will revert to you shortly.

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Q: History Function [BETA] wants to delete the selected history.

History Function [BETA] I would like your help to improve it so that users can select specific items to delete or choose to delete all.

jirawat.duJun 17, 2025
See detail
Founder Team
Vignesh_PolygrafAI

Vignesh_PolygrafAI

Jun 17, 2025

A: Hello, this is an upcoming feature under the 'History' tab. Our engineering team is working on it, and it will be available in the near term.

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Q: Can't you see that your arrogant responses to comments in reviews decrease people's desire to buy your program?

Someone noted that other programs indicate inaccuracies in AI detection when they are checked against each other. Your only response is that those other programs are inaccurate. Someone is upset about the failure to humanize the text. You can only reply that the related tool isn't intended for that purpose. By implication, you, onlooker, read the instructions carefully! You don't see that Polygraf AI has a summary rating of 2.5 out of 5, nor do you see how many people bothered to write anything about it (5). Perhaps you should compare Polygraf AI's marketing results with those of other similar programs and start being more polite to potential customers. Explain rather than criticize.

AlbertPLUSJun 11, 2025
See detail
Founder Team
Vignesh_PolygrafAI

Vignesh_PolygrafAI

Jun 11, 2025

A: Hi Albert. You are correct that tone is important, and we are not intentionally trying to be that way.

Let’s see if we can clear up our position here: Polygraf AI is not intended as an AI detection evasion or “humanizer” tool. We’re focused on transparency and providing insights on how AI-generated content is perceived on various platforms. The Humanizer is a free, optional beta tool that is designed to assist users in adjusting tone and structure to prevent spam filters and not to trick detection systems. But we also understand the frustration and confusion when expectations don’t match results. The detection space is still developing, and differences between platforms are frequent, even for popular tools. We're trying to improve the communication so that users can more easily understand what each Polygraf feature is for and where its boundaries are.

Thanks for taking the time to comment. All feedback - good or bad - helps us improve our product and our relationship with our users.

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Q: Will premium features ever be added to standard plans?

Will only be interested in purchasing if I have your word that in the future that premium features would released to your standard plans too. Right now everything seems super restrictive.

J_HJun 15, 2025
See detail
Founder Team
Vignesh_PolygrafAI

Vignesh_PolygrafAI

Jun 15, 2025

A: Hi there. Some of the Premium plan features, especially those involving advanced content analysis/generation and deeper AI detection, are extremely GPU-intensive and resource-heavy. We’re actively working on optimizing and deploying token usage efficiency upgrades shortly to make these features (and more) more accessible to other plans, so more users can try everything and grow from there. Since this is still ongoing, we can't commit which (and when) premium features will be available on the standard plan - but feature expansion is on our product roadmap. Thanks for considering Polygraf AI!

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