Originality.ai
AI content detector with plagiarism, fact, grammar and readability checks for publishers, agencies and schools.
Originality.ai is a content checking platform built around an AI detector that estimates whether text was written by a person or a language model. Originality.ai also scans for plagiarism, checks facts, grammar and readability, and works from pasted text, uploaded files or a URL. A limited free tier allows three AI scans per day.
Best for Editors, publishers, agencies and educators who review other people's writing and need AI and plagiarism checks in one report.
- Listed in
- AI Content Detection
- Platforms
- Web, Browser extension, API, Plugin, MCP
- Pricing model
- Freemium
- Starting price
- $12.95 per month Pro plan with yearly billing ($14.95 month to month)
- Free plan
- Yes
- Free trial
- No
- API
- Yes
- Made by
- Originality.ai
- Added
Last verified: . Information taken from originality.ai.
What is Originality.ai?
Originality.ai is a content integrity platform whose main product is an AI detector for text. You paste writing, upload a document or supply a URL, choose which checks to run and receive a score for each, with the sentences most likely to be machine-written highlighted. Alongside AI detection the suite offers a plagiarism checker, a fact and hallucination checker, grammar and readability checks, a content quality score, a guideline checker and bulk scanning. An adjustable AI allowance lets teams decide how much AI assistance they accept. Results can be shared as a link or downloaded as a PDF. Integrations include extensions for Chrome, Google Docs and Firefox, a Moodle plugin, an API and an MCP option; the Chrome extension can replay how a document was written. Team roles, scan tags and an opt-out from training data use are available.
Key Features
AI Detection
Scores text for the likelihood of AI authorship and highlights the sentences that drive the result.
Plagiarism Checking
Compares writing against existing sources and flags matching passages.
Fact and Hallucination Checker
Reviews factual statements in a draft and points out claims that may be wrong.
Readability and Grammar
Checks spelling and grammar and measures how easy a text is to read.
Site and Bulk Scans
Scans many texts in one job, or a whole website or single page from its URL.
Extensions, API and Team Tools
Runs inside Chrome, Google Docs, Firefox and Moodle, exposes an API, and supports team roles and tagged scans.
How Originality.ai works
Add the text
Paste the writing, upload a file or enter a URL.
Pick the scans
Select the checks to run, such as AI detection, plagiarism or content quality, and set the AI allowance.
Read the scores
Review the result for each selected scan and adjust the text where needed.
Use Cases
- Vetting Freelance Copy
- Check submitted articles for AI use and copied passages before publication.
- Classroom Assignments
- Review student work as one input in an academic integrity conversation.
- Auditing a Website
- Scan existing pages of a site to see what its content looks like to a detector.
- Proving Authorship
- Writers share a report or a writing replay to show how a piece was produced.
- Pre-Publication Fact Review
- Run a draft through the fact checker to catch errors before it goes live.
Pricing
Basic
Free
free, no subscription required
3 scans per day
- AI detection only
- Up to 2,000 words per scan
- File upload (docx, pdf, doc)
Pro
$14.95$12.95
per month, $155.40 billed yearly
2,000 credits per month
- 1 credit covers 100 words
- Full site scans
- Team management
- Chrome extension
Enterprise
$179$136.58
per month, $1,638.96 billed yearly
15,000 credits per month
- Everything in Pro
- API access
- 365 days of scan history
- Priority support
Prices as stated in the text of the official pricing page, which says all prices are in USD. Figures shown are per month with annual billing; the struck price is the month-to-month rate. Checked 9 Oct 2026 at originality.ai.
Things to know
- Scores are not proof on their own
- The site says an AI score should not be used alone for academic integrity discipline.
- Minimum length applies
- At least 100 words are needed for a scan, and shorter passages may be less accurate.
- Subscription credits expire monthly
- Unused plan credits lapse at the end of each month, while pay-as-you-go credits expire two years after purchase.
- Scan history depends on plan
- Pro and pay-as-you-go users can retrieve scans for 30 days, Enterprise users for 365 days.
FAQs
What is Originality.ai?
Originality.ai is a platform that detects AI-written text and also checks for plagiarism, factual errors, grammar problems and readability.
What is Originality.ai used for?
Originality.ai is used by publishers, agencies, teachers and writers to review content for AI use and copied material before it is published or graded.
Is Originality.ai free?
Partly. Originality.ai has a free Basic tier limited to AI detection, with three scans a day of up to 2,000 words each; the company says it does not offer a free trial of the paid product.
How much does Originality.ai cost?
Originality.ai lists Pro at $12.95 per month with yearly billing or $14.95 month to month, and Enterprise at $136.58 per month yearly or $179 monthly, all in USD.
Does Originality.ai have an API?
Yes. Originality.ai offers an API for AI and plagiarism checks, and its pricing page lists API access under the Enterprise plan.
Which languages does Originality.ai support?
Originality.ai says its AI detection can check text in 30 languages using a multilingual model.
Can Originality.ai give false positives?
Yes. Originality.ai notes that tools which rewrite or edit copy with AI can trigger false positives, that short texts are less reliable, and that it requires at least 100 words.
How do Originality.ai credits work?
On Originality.ai one credit covers 100 words. Subscription credits expire at the end of each month, and extra credits can be bought as a top-up.
Who it's for
- Content marketers
- Editors
- Web publishers
- Agencies
- Educators
- Writers
Comments
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Alternatives to Originality.ai
| Tool | Free plan | Starting price | API |
|---|---|---|---|
 CopyleaksContent integrity platform that detects AI-generated text, images and video and checks for plagiarism. |
— | — | Yes |
 ScribbrAcademic writing services and tools: proofreading, plagiarism checker, citation generator and AI detector. |
— | — | — |
 StealthWriterAI text humanizer with a built-in AI detector, three rewrite levels and sentence-by-sentence alternatives. |
Yes | $20/mo | — |
 CoGraderAI grading assistant that scores essays against a teacher's rubric and drafts feedback for the teacher to review. |
Yes | — | Yes |
GradPilotAdmissions essay grader that scores a draft against application-specific rubrics and adds AI detection. |
Yes | — | — |
Listed in the same category as Originality.ai. A starting price appears only where we checked it on the maker’s pricing page; a dash means not checked or not published. All AI Content Detection tools