Originality AI:
Forensic Content Detection
An independent, evidence-based tool that highlights exactly which sentences were generated by AI. Precision over marketing hype.
Document Analysis
v2.4.1Analyzing with AI…
Legend
See the Evidence, Not Just a Score
A single percentage tells you nothing about where a document actually breaks down. It could be one AI-written paragraph dragging up the average, or a document that's genuinely borderline throughout — you can't tell the difference from a number alone.
This tool marks up the text sentence by sentence instead, so the flagged parts are visible, not implied. You can see exactly which lines triggered the score and judge the rest of the document on its own merits.
The rain finally stopped just after noon. This created an optimal environment for the resumption of outdoor activities.
My grandmother always said the garden knows before we do. It is a sentiment that continues to resonate with many gardeners today.
3 of 4 sentences flagged
What Is Originality AI?
Originality AI is a detection tool built for people who publish text for a living — SEO teams, agencies, editors — and need to know whether a piece of writing came from a person or a language model. It works by scanning a document and scoring how closely its patterns match known AI output: word choice, sentence rhythm, how predictable the phrasing is.
This site runs an independent version of that same idea. Paste in a document and it breaks the text down sentence by sentence, so you can see exactly which parts read as AI-generated and which don't — instead of just handing you one number and asking you to trust it.
How the Analysis Works
Paste Your Text
Drop in up to 5,000 characters of any document you want checked — no formatting cleanup required.
We Check the Signals
Each sentence is scored on predictability and rhythm — the same statistical fingerprints every detector looks for (perplexity + burstiness).
Get the Sentence-Level Verdict
See a verdict stamp for the whole document plus a highlighted breakdown of exactly which sentences were flagged.
How Accurate Is Originality AI?
The vendor's own marketing puts accuracy at 99%. Independent testing tells a different story. Across several outside benchmarks, real-world accuracy lands somewhere between 76% and 94% depending on the test and content type — closer to four-in-five than "basically perfect." See our full accuracy breakdown for the test-by-test numbers.
The gap gets wider on newer AI models. As language models keep improving, their output gets harder to fingerprint, and detection rates on the newest generation of models have dropped as low as 31.7% in some tests. That's not a flaw unique to this one tool — every detector on the market is chasing a moving target. But it's worth knowing before you treat any single score as proof of anything.
Does Originality AI Have a Free Trial?
The checker on this page is free to use, no account or card required. Paste in up to 5,000 characters and you'll get a sentence-level breakdown in your browser — no signup wall.
Originality AI Pricing
Beyond this free checker, our AI Detector tool gives you three ways in. Pick whichever fits how often you'll actually use it.
Try full access before committing to a plan.
- Full AI Detector access
- No long-term commitment
Unlimited access, cancel any time.
- Unlimited monthly access
- Cancel any time
- Priority processing
Under $8/month — best value for regular use.
- Unlimited yearly access
- Lowest effective rate
- Priority processing
How to Bypass Originality AI Detection
We're covering this because understanding why detection fails is part of understanding whether it works — not as encouragement to game the system. Detectors like this one are mostly reading two things: perplexity (how predictable your word choices are) and burstiness (how much your sentence lengths vary).
- Paraphrasing and Rewriting: Manually rewriting AI-generated text to use less common vocabulary.
- Humanizer Tools: Services specifically designed to inject natural variance into AI text.
- Mixing in Personal Examples: Adding anecdotes, personal experiences, or specific localized data that AI typically lacks.
- Varying Sentence Structure: Intentionally mixing very short, punchy sentences with long, complex ones.
- Adding Factual Data: Injecting highly specific, recent statistics or quotes.
- Using Advanced Models: Newer models often write with higher variance, naturally scoring lower on detectors.
Originality AI vs Turnitin
Turnitin lives inside schools — you don't get to buy it yourself, your institution does. Originality AI and tools like this one are public-facing instead, which makes them useful for publishers and freelancers who have no institutional account to lean on. The two differ significantly in detection method, pricing model, and who can actually access them.
Frequently Asked Questions
Is Originality AI accurate?
Is Originality AI free?
Can professors detect AI with Originality AI?
What is Originality AI used for?
How does Originality AI work?
Can I bypass Originality AI?
What Users Are Saying
"The sentence-by-sentence breakdown is exactly what I needed. Other tools just give a number and expect you to trust it. This shows you the evidence."
"I use this to check freelance submissions before publishing. It's fast, free, and the forensic highlighting makes it easy to see exactly where the writer got lazy."
"A clean, no-nonsense interface. I appreciate the honesty about false positives and the limitations of AI detection. It builds trust."