Polygraf AI

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

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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

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Instantly detect AI-generated content, plagiarized text, and even edits made with Grammarly
Get deeper content insights with AI highlighting and writing analysis

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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

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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
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Questions & Reviews

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Showing 5 of 32 questions

Q: Any progress on Poorlygraf?

On June 16th you wrote under my review: "feedback is being taken into account. We’re actively working on deploying token usage efficiencies. Once that is done, we’ll then look at making these features available on other plans, so users can try everything. And also, users like you who use the tool occasionally can then still access these powerful features when they need them."

Sadly, Poorlygraf seems to be stuck at it's limited functionality. Moreover, since writing my review, I've tested the AI Detector on some of my original writings from 20 years ago and I'm told they're AI generated? Linguix, a popular spelling-grammar checking LTD from AppSumo, easily detects "humanized" text from Poorlygraf as "AI-generated." What gives?

triangleforcesAug 14, 2025
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Q: Clarification on Token Refresh Schedule for Lifetime Tier 1 (Standard)

Hi,
Could you please clarify when the 150,000 monthly tokens for the Lifetime Tier 1 (Standard) plan are refreshed? Is it on the 1st of each month or based on the original purchase date?

Thanks!

tayyab_khalidPLUSJul 19, 2025
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Founder Team
Yagub_PolygrafAI

Yagub_PolygrafAI

Jul 19, 2025

A: It is every month on the day that you activated your account.

E.g. purchased on the 5th, activated on the 19th, it will be reset on the 19th of each month.

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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
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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
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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
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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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