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AI content detector
An AI content detector for content you're about to publish
AI Likelihood is the AI content detector inside the WriteWorks editor, made for marketing teams checking drafts before they go live. It estimates how likely a draft is to read as AI-written and shows the sentences driving the estimate. You get a calibrated probability with a range and a confidence level, never a verdict, so an editor can decide what to do with it.
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SCSam Cartersam@example.com
WRITEWORKS
Create/Editor
Search brands, prompts, competitors…⌘K
New1.2M (62%) leftAsk AI
The challenge
Why most AI detectors don't help editors
Verdicts, a separate tab and nothing to change.
Detectors that issue verdicts
A single "98% AI" with no range treats an estimate as a fact, and gets used to judge writers on evidence it doesn't have.
Checks that live in another tab
Pasting drafts into a separate checker means the result never reaches the draft, the editor or the approval.
No idea which sentences are the problem
A page-level number gives the writer nothing to change.
Third parties hold the citation
Roundups, reviews and forums are quoted ahead of your own pages, and nothing tells you which source displaced you.
The solution
How the AI content detector works
A calibrated probability, the sentences behind it and an accuracy bar it must pass first.
AI Likelihood shows a band (Likely human, Mixed or Likely AI), an approximate percentage, the range around it and a confidence level. The Likely AI band is set so that no more than 1% of human writing lands in it.
The card lists the sentences that push the estimate most, so the writer knows where to look. The same Human tab holds Human Signal, which says what to add to make the page more useful.
No probability appears until a detector model has passed a release gate on held-out data: a false-positive rate of 1% or less overall and on every stress test, strong ranking accuracy and calibration, tested on at least 1,000 human and 1,000 AI samples from five or more model families. Until a model passes, add-on holders are told it's being validated and scans don't count.
On the Agency tier of the AI Detection add-on, the same detector is available through the WriteWorks API with an API key, for agencies checking content across clients. Text sent to the API is not stored.
Success story
What real brands fixed with WriteWorks
What each brand fixed, measured before and after with the same audit, in their own words.
“Not one of our influencer directory pages reached 200 words. Now 100% of them do, and the share of pages carrying schema jumped from 39% to 99%.”
KL
Capabilities
What's on the card
Everything AI Likelihood shows.
AI Likelihood card
In the Human tab of the editor review panel.
Calibrated bands
Likely human, Mixed, Likely AI.
Range and confidence
An interval around every estimate.
Sentence drivers
The sentences that move the estimate most.
Monthly scan allowance
Scans used this month shown on the card.
Detection API
On the Agency tier, with a scoped API key.
Time savings
What changes
A pre-publish check inside the edit.
TaskBeforeWith WriteWorksTime saved
Check a draft before publishingCopy it into a separate checkerAI Likelihood in the editorThe context switch
Decide whether to reviseA bare percentageBand, range and the sentences driving itSecond-guessing
Check client content at scaleOne paste at a timeDetection API on the Agency tierManual checks
Included
What's included
AI Likelihood and the AI Detection add-on.
AI Likelihood in the editor's Human tab
Likely human, Mixed and Likely AI bands, calibrated so Likely AI catches no more than 1% of human writing
Approximate percentage with a range and a confidence level
Sentences driving the estimate
English only; at least 300 words
Nothing shown until a model passes the release gate
Available with the AI Detection add-on, on any plan
Detection API on the Agency tier; text sent to the API is not stored
Built for
Who uses it
Teams that publish under their own name.
Content leads
A pre-publish check that informs the edit instead of replacing it.
Editors
See which sentences read as machine-written and send them back with a reason.
Agencies
Check client content in the editor or through the API.
Featured story
Surge45
“We advise SaaS brands on AI search, so having every page of our own site built on request was a little awkward. We switched to cache-friendly HTML, cleaned up the heading order, repaired our broken FAQ blocks and trimmed the sitemap. On the re-audit, 87% of pages came straight from cache, up from 0%, and every guide was in heading order. Some of our insight articles are still slow, and they're next.”
Surge45 team
Read the full story0% → 87%
Pages served from cache
2.5x
Faster median server response to crawlers
32% → 100%
Guides and FAQs with a clean heading structure
FAQ
Frequently asked questions
Everything teams typically ask before getting started.
What is an AI content detector?+
An AI content detector estimates how likely a piece of text is to have been written by an AI model. Good ones present that as a probability with uncertainty, not a yes or no, because no detector is certain. AI Likelihood in WriteWorks shows a band, a percentage, a range and a confidence level.
Does Google penalize AI content?+
Google's published guidance says it rewards helpful, reliable content however it was produced, and treats content made mainly to manipulate rankings as spam, whether a person or a machine wrote it. So the question to ask of a draft is whether it is useful and original. That is what Human Signal scores; AI Likelihood tells you how the draft is likely to read.
Is AI Likelihood a verdict on who wrote the text?+
No. It is a calibrated probability, not a verdict. It's designed so that no more than 1% of human writing lands in Likely AI, and it always shows the range around the estimate. Use it to decide where to edit, not to judge a writer.
Which languages and lengths does it support?+
English only, and at least 300 words. Other languages are declined rather than scored, and shorter drafts are told how many more words are needed.
Is there an AI detection API?+
Yes, on the Agency tier of the AI Detection add-on. Send text to the WriteWorks API with a key that has detection access and get the same estimate the editor shows. Text sent to the API is not stored.
How do I get AI Likelihood?+
Add the AI Detection add-on to any plan. It comes in Starter, Pro and Agency tiers, listed on the pricing page, with add-on pricing shown in the platform before you buy. Scans beyond the monthly allowance use AI tokens from your plan.
Is there still a standalone AI detector page?+
No. AI detection now lives in the editor, next to the draft it's checking, so the result feeds straight into the edit.
Two readings, one tab
AI Likelihood and Human Signal answer different questions
AI Likelihood: how does it read?
A calibrated estimate of how likely the draft is to read as AI-written, with the sentences behind it.
Human Signal: is it worth citing?
An EEAT and information-gain score that tells the writer what to add.
See Human Signal Explore more
Keep exploring
Related solutions, adjacent use cases, and platform features.
Check how a draft reads before it goes live
AI Likelihood gives your editors a calibrated estimate, a range and the sentences behind it, inside the editor they already use.