Check Your Text Against 12 AI Detectors From Inside Your Chat

Before anyone submits AI-assisted writing, they run the same ritual: copy the text, open ZeroGPT, paste, check the score, open GPTZero, paste again, check again, maybe try Copyleaks if they're nervous. It's tedious, and you never quite trust any single number.

The SupWriter MCP server folds that whole ritual into one tool call. Your AI assistant runs the check, and you get an overall score, a verdict across twelve popular detectors, and a sentence-by-sentence breakdown — without leaving the conversation or pasting into a single external site.

Why a tool call beats the manual ritual

The manual approach has two problems. First, it's slow — every detector is a separate tab and a separate paste. Second, each detector disagrees with the others, so checking one tells you very little. We've written before about why AI detectors give different results on the same text; the practical takeaway is that you want a spread of verdicts, not a single score.

The detect_ai tool gives you that spread in one shot. You hand it text, and it returns:

• an overall score from 0–100 (higher means more likely AI),
• verdicts across 12 detectors — Turnitin, GPTZero, OpenAI, Copyleaks, ZeroGPT, Crossplag, Sapling, Quillbot, and others — each flagged pass / warn / fail,
• a sentence-level breakdown so you know which sentences are dragging the score up, instead of guessing.

That last part is the useful one. A single number tells you there's a problem; the sentence breakdown tells you where to fix it.

Reading the output

When the assistant runs detect_ai, it gets back the score, the per-detector map, and the flagged sentences. A good assistant will summarize it for you — "scores low overall, but these three sentences in the second paragraph are flagged as likely AI" — and you can act on exactly those. Then you humanize the flagged passage, re-run the check, and watch the score move. Detect → humanize → re-detect is a tight, fast loop when it all happens in one thread.

Free vs paid — stated plainly

AI detection is unlimited on paid plans — Pro and Ultra users can run as many checks as they want, no credit cost. On the free plan, each check draws on your lifetime word credits, the same pool the other tools use. Either way, your per-request word cap applies (500 words on free/basic, 1,500 on Pro, 3,000 on Ultra). If a free user is out of credits, the tool says so clearly instead of returning a bogus result.

An honest caveat about "scores"

No detector is ground truth. They're probability estimates, they disagree, they produce false positives on genuinely human writing, and they shift their models constantly. A SupWriter detection score is a useful signal — especially the spread across twelve tools and the sentence breakdown — but it's a signal, not a verdict. Use it to find weak spots and to sanity-check before you submit, not as proof of anything. If you want to understand the limits, are AI detectors even accurate? is worth your time.

Pair it with the humanizer

The real workflow is the loop: detect to find the flagged sentences, humanize to fix them, detect again to confirm. Because both tools live in the same SupWriter connector, your assistant can run the whole cycle in one conversation.

Connecting it

Add https://supwriter.com/api/mcp in your AI client's connector settings, sign in with your SupWriter account, and approve. Step-by-step for Claude, ChatGPT, and Cursor / Claude Code / VS Code.