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Writing & SEOOriginality.ai

Originality.ai

Originality.ai is an AI content detector and plagiarism checker from Originality.ai, a company based in Collingwood, Ontario. It scores whether text is likely human-written or AI-generated in 30 languages and adds fact checking, readability and grammar tools. Publishers, SEO agencies, editors and teachers use it to review work from freelancers and students.

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Quick facts

VendorOriginality.ai
CategoryWriting & SEO
PlatformsWebBrowser extensionAPI
Free planYes
Pricing from$14.95/month
Last reviewed

Best for

  • Publishers vetting freelance writers
  • SEO and content agencies
  • Teachers reviewing essays

Key features

AI Checker

Returns a probability that a text is original or AI-generated; each scan needs at least 100 words.

AI Allowance

Lets you set how much AI assistance a project permits, then reports whether a text likely stays above or below that share.

Plagiarism checker

Flags potentially copied passages; running AI and plagiarism checks together costs 2 credits per 100 words.

Multilingual detection

Detects AI-written text in 30 languages and automatically picks the best non-English model for the input.

Writer replay for Google Docs

The free Chrome and Firefox extensions replay how a Google Doc was typed, show contributors and flag likely auto-typing tools.

Fact checking aid

Reviews claims in a draft to help catch false facts and AI hallucinations before an article is published.

Site scans and API

Scans whole websites or single URLs on paid plans, while Enterprise adds API access for automated checks.

Use cases

  • Screen a freelancer's blog post for AI use and copied passages before approving payment.
  • Replay a student's Google Doc to see whether an essay was typed gradually or pasted in.
  • Scan every page of a website you plan to buy to estimate how much content is AI-generated.
  • Check a product roundup for factual errors before it goes live.

Pricing

Pricing from
$14.95/month

Basic is free for 3 AI scans a day of up to 2,000 words each. Pro is $14.95/month, or $12.95/month billed yearly, with 2,000 credits; Enterprise is $179/month, or $136.58/month yearly, with 15,000 credits.

Ways to save

  • Yearly billing cuts Pro from $14.95 to $12.95 a month, a $24 saving over the year.
  • The free checker runs 3 AI scans a day of up to 2,000 words without an account, enough for occasional spot checks.
  • Subscription credits expire at the end of each month, while separately purchased credits last 2 years, so top-ups suit irregular workloads.
Prices checked on Oct 12, 2026

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What is Originality.ai?

Originality.ai is a web app for checking content before it is published or graded. You paste text, upload Word or PDF files, or enter a URL, and it returns AI and plagiarism results that you can download or share as read-only reports.

How Pro and Enterprise differ

Both paid plans share the same core tools; the differences are volume, history and support.

  • Pro: 2,000 credits a month, 30 days of scan history, team management, extra seats at $9.95/month.
  • Enterprise: 15,000 credits, 365 days of history, API access, extra seats at $24.95/month.

Limitations

AI detection is probabilistic. Originality.ai itself notes that AI editing tools, including some Grammarly features, can cause false positives and that short texts reduce accuracy. Monthly subscription credits do not roll over, plagiarism checks require a paid plan, and paste-ins to the free detector may feed model training unless you have an account and opt out.

Originality.ai FAQ

Partly. The free AI checker allows up to 3 scans a day of up to 2,000 words each, with no account needed. It covers AI detection only, and there is no free trial of the paid Pro or Enterprise plans.

One credit covers 100 words of AI checking, and a combined AI and plagiarism scan uses 2 credits per 100 words. Pro's 2,000 monthly credits therefore cover about 200,000 words of AI-only scanning.

Originality.ai publishes its own accuracy studies and reports 97.8% overall accuracy for its multilingual model, but it calls scores probabilities, not proof. It advises against using an AI score alone for academic discipline.

Text entered in the free AI detector may be used for training. Account holders can opt out of data use for AI training, and full removal of an account and its data is available on request.

Only Enterprise. At $179 a month, or $136.58 a month billed yearly, it adds API access, 15,000 monthly credits, 365 days of scan history, priority support and a dedicated customer success manager.

Alternatives to Originality.ai

Grammarly

AI writing assistant for grammar, tone and rewriting across apps.

QuillBot

Paraphrasing, grammar checking and AI detection for students and writers.

Wordtune

AI rewriting and summarizing assistant that sharpens your sentences.

Sources

Reviewed on Oct 12, 2026

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