GPTZero
AI-writing detector for educators that flags ChatGPT, Claude, and Gemini text, plus plagiarism checks and authorship writing reports
FREEMIUM Verified JUL 6, 2026
Originality.ai
AI content detector, plagiarism checker, and fact-checker for publishers and agencies, priced by scan credits
Originality.ai is an AI-content detector, plagiarism checker, and fact-checker aimed at publishers and agencies. It runs on credits — 1 credit scans 100 words. Pay-as-you-go starts at $30 for 3,000 credits; the Pro subscription is $14.95/month for 2,000 monthly credits, and Enterprise is $179/month for 15,000 credits plus API access. Useful for auditing writer output at scale — but no AI detector is definitive.
Verified JUL 8, 2026 USAGE-BASED Live
What is Originality.ai?
Originality.ai is a content-integrity platform built for publishers, agencies, and editors who need to check whether text was written by a human, copied from the web, or generated by an AI model. Its flagship feature is an AI content detector trained on outputs from ChatGPT, GPT-5, Claude, Gemini, Grok, and other tools, but it bundles several checks into one workflow: a plagiarism scanner that compares text against indexed web sources, a fact-checker that flags claims and surfaces citations, and readability and grammar tools. Everything is metered in credits, where 1 credit scans 100 words — an AI-only scan costs 1 credit per 100 words, and adding plagiarism doubles that to 2 credits per 100 words.
Pricing splits three ways. Pay-as-you-go is a one-time purchase of $30 for 3,000 credits (extra credits at $0.01 each) that stay valid for 2 years, which suits occasional users. The Pro subscription is $14.95/month for 2,000 credits per month plus team management, full-site bulk scans, file uploads, and a 30-day scan history. Enterprise is $179/month for 15,000 monthly credits, full API access, a 365-day history, and a dedicated success manager. A Chrome extension checks content inside Google Docs or any webpage and can replay a document’s writing history, and a Moodle plugin serves education. Subscription credits reset monthly and do not roll over.
Who is it for?
Originality.ai is aimed at teams that publish or commission volume content and need a repeatable way to screen it before it goes live. It is less a writing assistant than a quality-control gate — the value is in scanning other people’s work at scale rather than improving your own drafts. Anyone relying on its verdicts should remember that no detector is definitive: false positives on human writing and false negatives on paraphrased AI text are both real, so scores are best used as a signal, not a ruling. For a detector focused more on education and individual checks, GPTZero is a common alternative.
- Publishers and content marketers bulk-scanning websites and article pipelines to keep AI content within an editorial policy and protect SEO.
- Agencies and content shops auditing freelance writer submissions for undisclosed AI or plagiarism before invoicing a client.
- Editors and SEO teams who want plagiarism, AI detection, and fact-checking in a single credit-based tool instead of three subscriptions.
- Educators and institutions using the Chrome extension’s writing-replay history and the Moodle plugin to check student submissions.
How much does Originality.ai cost?
Starting price: $14.95/mo · Free tier: no · Model: usage-based
Pricing verified JUL 8, 2026
Price history tracked from June 2026
| Plan | Price | Includes |
|---|---|---|
| Pay-as-you-go | $30 one-time | 3,000 credits (~300,000 words on an AI-only scan) · Additional credits at $0.01 each · Credits expire 2 years after purchase · Core AI detector, plagiarism, fact-check, readability · No monthly subscription, but fewer team features than Pro |
| Pro | $14.95/mo | 2,000 credits per month (reset monthly, no rollover) · $12.95/mo billed annually · Team management and full-site / bulk scans · File uploads and 30-day scan history · Chrome extension for Google Docs and any webpage |
| Enterprise | $179/mo | 15,000 credits per month · $136.58/mo billed annually · Full API access for content platforms · 365-day scan history · Dedicated success manager and priority support |
What are Originality.ai's key features?
- AI content detector covering ChatGPT, GPT-5, Claude, Gemini, Grok, and other models
- Plagiarism checker that compares text against indexed web sources
- Fact checker that flags claims and surfaces citation sources
- Readability, grammar, and spelling checker
- Credit-based scanning: 1 credit per 100 words (AI-only), 2 credits per 100 words with plagiarism
- Chrome extension for Google Docs and any webpage, with writing-replay history
- Full-site and bulk scanning for publishers, plus team management and shared scan history
- Developer API (Enterprise) and a Moodle plugin for education
What people use Originality.ai for
- 01 Auditing freelance or agency writer submissions for undisclosed AI-generated content before publishing
- 02 Bulk-scanning an existing website or content library for AI content to protect SEO and editorial standards
- 03 Running plagiarism checks on articles, essays, or web copy against indexed internet sources
- 04 Fact-checking drafts against cited sources before publication
- 05 Verifying authorship with the Chrome extension's writing-replay history inside Google Docs
Pros and cons
| Pros | Cons |
|---|---|
| Combines AI detection, plagiarism, fact-check, and readability in one credit-based workflow instead of stitching separate tools together | No AI detector is definitive — Originality.ai produces false positives on genuinely human-written text, which can unfairly flag real writers |
| Pay-as-you-go credits (3,000 for $30, valid 2 years) suit occasional users who don't want a monthly subscription | Detection is evadable: paraphrasing tools, manual editing, and newer models can push AI content below the flagged threshold |
| Bulk / full-site scanning and team management scale to agency and publisher workloads | No permanent free plan — the site offers only a limited demo detector, and using the real product requires buying credits |
| Chrome extension checks content directly in Google Docs and can show a writing-replay history for authorship | Pro subscription credits (2,000/month) expire at month-end with no rollover; only separately bought pay-as-you-go credits last 2 years |
| Headline accuracy figures come from the vendor's own and commissioned studies; independent results vary by model and text type |
What are the best Originality.ai alternatives?
How people make money with Originality.ai
- Offer AI-content-audit and editorial-QA services to agencies and publishers on a per-project or retainer basis — screening writer submissions for undisclosed AI and plagiarism before publication
- Provide bulk site-scan audits for blogs and content libraries flagging AI-written pages that risk SEO or editorial-policy penalties
Frequently asked questions
How much does Originality.ai cost?
There are three ways to pay. Pay-as-you-go is $30 for 3,000 credits (extra credits $0.01 each), with credits valid for 2 years. The Pro subscription is $14.95/month (or $12.95/month billed annually) for 2,000 credits per month. Enterprise is $179/month (or $136.58/month annually) for 15,000 credits plus API access.
Is there a free version of Originality.ai?
There is no permanent free account. The website offers a limited demo AI detector you can try without paying, but saving scans and using the full suite — plagiarism, fact-check, bulk scans, and history — requires buying credits or a subscription.
How do Originality.ai credits work?
One credit scans 100 words. An AI-only scan costs 1 credit per 100 words, and adding plagiarism detection costs 2 credits per 100 words. Pay-as-you-go credits last 2 years after purchase; subscription credits reset each month and do not roll over.
How accurate is Originality.ai, and can it be wrong?
Originality.ai advertises high accuracy in its own and commissioned studies, but no AI detector is definitive. It can return false positives on genuinely human-written text and false negatives on paraphrased AI text. Treat its score as a signal to investigate, not as proof of how content was written.
Can Originality.ai detect ChatGPT and Claude?
Yes. Its detector is trained on outputs from major models including ChatGPT, GPT-5, Claude, Gemini, and Grok. Detection is still evadable — running AI text through a paraphraser or editing it heavily can lower the flagged percentage.
Does Originality.ai have an API and a Chrome extension?
Yes to both. The developer API is available on the Enterprise plan for content platforms and automated workflows. A Chrome extension works on Google Docs and any webpage, and includes a writing-replay feature that shows a document's creation history.
Does Originality.ai check for plagiarism as well as AI?
Yes. Alongside AI detection it runs a plagiarism check against indexed web sources. Combining both in a single scan costs 2 credits per 100 words instead of the 1 credit charged for an AI-only scan.