Originality.AI - AI Content Checker and Plagiarism Check
Originality.AI · AI Detection
Originality.AI is an AI content checker that scans text for machine-written passages and copied content in one report. It runs on the web, in a browser extension, and through an API.
About Originality.AI - AI Content Checker and Plagiarism Check
What Is Originality.AI
Originality.AI answers a question teachers, editors, and publishers ask every day: did a person write this, or did a machine? It grades text for AI-generated passages and for plagiarism at the same time, then shares those findings in a single report you can defend to a student, a client, or a boss.
The tool leans on third-party testing to stand apart. Its team points to independent studies that place its AI detector ahead of the free checkers most people try first, and it keeps retraining against paraphrasing tools like Quillbot and Grammarly that rewrite AI text to look human. For a newsroom or a university running hundreds of documents a month, that accuracy margin is the whole reason to pay.
The limits matter just as much. Detection is a probability, not proof, so a flagged sentence still needs a human read. The free checker caps you at 3 scans a day and 2,000 words per scan, and the credits on paid plans reset each month whether you use them or not. There's nothing to install beyond a browser extension, since everything runs in the cloud.
Getting Started
- Open originality.ai and start a free scan, or create an account if you want to save and tag your history.
- Add text by pasting it, uploading a docx, doc, or PDF file, or dropping in a website URL.
- Run the scan and pick which checks you want: AI detection, a plagiarism check, a readability score, or a grammar pass.
- Read the report, which breaks the text into fragments and flags each one that reads as machine-written, with a percentage behind the score.
- Open a paid plan when the free scans run out, or connect the API to push checks straight into your own publishing or grading workflow.
Product Information
A quick look at Originality.AI - AI Content Checker and Plagiarism Check's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Teachers and professors
- Editors and publishers
- Students and freelance writers
Tasks
- Checking a draft for AI writing
- Finding copied content
- Vetting AI-paraphrased text
Scenarios
- Grading assignments at scale
- Screening content before publishing
- Checking your own writing first
Key features
AI Detection Built on Adversarial Training
The core AI content checker scans for machine-written text and reports high accuracy in third-party studies the company collects on its site. It covers output from ChatGPT, GPT-5, Gemini, Claude, and other popular models, and it keeps matching against paraphrasing tools that rewrite AI text to sound human.
Combined Plagiarism Check
The same scan also runs a plagiarism check that compares your text against the open web and a shared database of documents. It reports matched sources alongside the AI score, so one report answers both "was this copied" and "was this generated."
Readability and Grammar Scoring
Beyond detection, the tool scores how easy a piece is to read and runs a grammar and spelling pass. Publishers use the readability score to keep articles in the range that ranks well in search, which saves a separate trip to another tool.
URL and Full Site Scans
Instead of pasting text, you can drop in a URL and scan a single page or a whole website. This suits editors checking a freelancer's published work or agencies auditing a client's back catalog for AI content.
Chrome and Google Docs Extension
A browser extension runs scans directly inside Google Docs and shows an AI score as you write. It records a replay of the writing process, which schools use to see a document take shape rather than judging only the final draft.
API for Automated Workflows
The API lets teams run AI and plagiarism checks inside their own tools, so a CMS, an LMS, or a grading pipeline can flag content without anyone opening the dashboard. The API sits on the Enterprise plan.
Pros and cons
Pros
- The AI content checker is backed by independent third-party studies, which gives you something concrete to point to when a result is challenged.
- AI detection, a plagiarism check, readability, and grammar land in one report, so you don't juggle four separate subscriptions.
- A free tier with 3 scans a day lets you test accuracy on your own writing before paying.
- The Chrome and Google Docs extension fits writing work, and the API fits automated pipelines.
- Adversarial training against paraphrasing tools catches AI text that's been edited to hide its origin.
Cons
- Detection is a probability, so a high AI score isn't proof, and a false positive can land on a genuine human draft. Someone still has to read the flagged passages.
- Free scans cap at 2,000 words each and 3 per day, which is tight for a long thesis or a full manuscript.
- Paid credits reset every month and don't roll over, so unused credits are lost.
- API access is locked to the Enterprise plan, which rules out the cheaper plans for small teams that want automation.
Frequently asked questions
It checks text for two things at once: whether passages were written by an AI model, and whether they were copied from another source. It also scores readability and grammar, and shares everything in one report.
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