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AI Plagiarism Checker — free style, AI risk, and sentence evidence in one scan.

TextSight bundles a Plagiarism Risk score and full AI detection into a single scan, so you can spot the soft plagiarism patterns (clichéd phrasings, stock textbook definitions, uncited specifics) and the AI-style cadence in the same pass. It is honestly not a database-comparison tool: we do not crawl academic indexes the way Turnitin and iThenticate do, and we will not pretend otherwise. What we give you is a fast style triage with sentence-level evidence for every flag, so you know exactly which line to rewrite, which claim needs a citation, and which sentence is just filler you should cut.

Run a free scan See the 4-step workflow
3 scans/day free Plagiarism Risk + AI score bundled Sentence-level evidence
What this checker covers

Stylistic patterns, AI risk, sentence evidence — in one pass.

Most writers think plagiarism is one problem. It is really two, and they need different tools. Here is what TextSight covers and what it deliberately does not.

What we check

The scan returns three numbers in the same pass. The Plagiarism Risk score looks at stylistic patterns that suggest copying: clichéd or stock phrasings, generic textbook-style definitions that appear identically across many sources, and specific claims such as statistics, dates, or named studies presented without a citation. The AI score reads the statistical fingerprint of the prose for ChatGPT, Claude, Gemini, and Llama patterns. The sentence evidence highlights every flagged passage with a one-line reason next to it, so you do not have to guess which line triggered the score.

What we do not check

We do not crawl a web index or an academic database, so we cannot confirm that a sentence was copied from a specific source URL or a specific paper. For database-backed matching against academic sources, the right tool is Turnitin, iThenticate, or Copyleaks. Treat TextSight as the continuous style triage that runs throughout your drafting and treat a database tool as the final gate before you submit. That two-tool stack is the honest setup and it is cheaper than buying a heavyweight database subscription you only need once.

Why bundling AI risk matters

A clean Turnitin report can still leave you exposed to AI-content concerns. A clean AI score can still leave you exposed to lifted source paragraphs. Running both checks separately means tab-switching and double-paying. The TextSight scan combines the Plagiarism Risk score with the AI score and the Authenticity Score in one click, so you see the same draft scored against three lenses without leaving the page.

Four steps

Paste, read the scores, review highlights, then revise.

The workflow is short on purpose. Most drafts clear in two passes. The point is to make the loop between scanning and revising fast enough that you actually use it before submission instead of skipping it.

Step 1: Paste your draft

Open the scanner and paste up to 5,000 characters on the free tier, around 800 words, which covers most essay sections and most blog drafts. Pro and Business raise the per-scan limit and accept PDF or DOCX upload. No signup is required for the first scan; the free tier resets at midnight UTC and gives you three scans every day with no card on file.

Step 2: Read the three scores

The result panel shows the Plagiarism Risk score, the AI score, and the Authenticity Score side by side. Low Plagiarism Risk plus low AI score is the clean submission zone. High Plagiarism Risk with a low AI score usually means you have clichéd phrasings or uncited specifics to clean. High AI score with low Plagiarism Risk usually means the prose reads as machine-generated even though the content is original. Both being high is the patchwriting plus AI-assist combination that institutions penalise the hardest.

Step 3: Review the sentence highlights

Click into any flagged sentence to see the reason: stock phrasing, stock definition, uncited specific, or AI-style cadence. The highlight tells you what the matcher saw, not just that it saw something. This is the difference between a score that gives you a number and a score that gives you a fix. You always know which line to work on and why.

Step 4: Revise and re-scan

For each flagged passage you have three choices: add a citation if the claim is genuinely from a source, rewrite the sentence in your own words, or cut filler entirely (clichéd transitions, generic definitions). Re-scan to confirm the flag clears and the score drops into the safe band. Most drafts only need one revision pass; a heavily AI-assisted draft may need two.

Plans & pricing

Plagiarism Risk score and AI detection on every tier.

Free includes 3 scans a day with the Plagiarism Risk score, the AI score, and sentence-level evidence bundled in. Paid tiers raise the per-scan character limit and add file upload, the Chrome extension, and the REST API. Yearly billing saves 25%.

Free
$0/forever

 

Try the scanner with no card.
  • 3 scans/day
  • 5,000 chars per scan
  • Plagiarism Risk + AI score
  • Sentence-level evidence
Start free
Starter
$7.49/month

Billed $89.88/year — Save $30

For students and light writers.
  • Unlimited scans
  • 10,000 chars per scan
  • Chrome extension
  • Email support
Get Starter
Business
$29.99/month

Billed $359.88/year — Save $120

For agencies and small content teams.
  • 150,000 AI rewriter words/mo
  • REST API access
  • 5 team seats
  • Bulk upload
Get Business

Yearly billing saves 25%. View full pricing

Honest scope

How this differs from Turnitin, iThenticate, and Copyleaks.

Database-comparison tools and style-pattern tools answer different questions. Use the one that fits the job, or use both. Here is the line.

Turnitin and iThenticate

Both run your draft against a curated index of academic papers, student submissions, and crawled web pages. They are strong on direct copy-paste detection because the comparison is text-against-text. They are weak on the soft category of plagiarism: clichés, generic definitions, and uncited specifics that come from somewhere but the writer cannot remember where. TextSight handles that soft category. Run TextSight throughout drafting, run Turnitin or iThenticate once as a final submission gate.

Copyleaks

Copyleaks is a general similarity tool with a bigger marketing focus on enterprise. It also has an AI detector layered on top. Same trade-off as Turnitin on the plagiarism side: strong on database matching, weaker on the style triage TextSight does. If your institution mandates a Copyleaks report, use it for the final check and use TextSight for continuous drafting cleanup.

TextSight (style + AI risk)

TextSight runs locally on the text you paste. We do not crawl a web index. We analyse style, phrasings, cadence, and citation-risk patterns, and we run AI detection in the same pass. Output is a 0 to 100 Plagiarism Risk score, an AI likelihood band, sentence-level evidence for every flag, and an Authenticity Score. The intended use is fast iteration during writing, not certification of a final draft against an academic database.

Mix and match

A two-tool stack covers both kinds of plagiarism.

Style triage is cheap and continuous. Database matching is heavier and used as a final gate. That split is the honest workflow.

Use TextSight throughout drafting

After every paragraph or section you finish, paste it into the scanner. The scan takes seconds and tells you whether the prose is clean on style and AI risk before you move on. Catching a clichéd opener at the time you write it is much cheaper than discovering it the night before submission, when rewriting an entire paragraph for a borrowed phrase you no longer remember writing is the worst version of editing.

Use Turnitin or iThenticate as the final gate

Once the draft is locked, run it through your institution Turnitin licence or your publisher iThenticate access for the database match. This is the certification step: a clean report against the academic index is what your grading rubric or editor needs to see. TextSight will not replace this step, and a database tool will not replace the continuous style triage. The two tools are doing different jobs.

Pair both for high-stakes submissions

For dissertation chapters, paid client copy, or a journal manuscript, run both. TextSight first to clear AI fingerprints and stylistic risks, then a database scan for source matching. Three tools, three jobs, no overlap. That is the cleanest stack and it is what most professional writers settle into once they have been burned once by a missed flag from the wrong category.

A real flagged paragraph

What sentence-level evidence actually looks like.

A score on its own is not actionable. The sentence evidence is the thing that lets you fix the draft in minutes instead of guessing where the problem is.

The paragraph as pasted

Throughout history, humans have created art to express their emotions. According to recent studies, 87 percent of people find art therapeutic. The Mona Lisa, painted in 1503, remains one of the most famous artworks in existence.

The three flags the scanner returns

Flag 1: stock phrasing. "Throughout history" is a clichéd opener that drifts into student writing from somewhere nobody can name. It is not legal plagiarism, but a grader will recognise it as filler. Cut or rewrite.

Flag 2: uncited specific. "According to recent studies, 87 percent of people" makes a specific factual claim with no source attached. The scanner flags every claim that looks like a statistic and has no citation. Decide: add a citation, soften the claim, or remove it.

Flag 3: stock definition. "The Mona Lisa, painted in 1503" has a very high textbook-overlap pattern. The scanner does not fact-check, but the flag prompts you to verify, which is fortunate, because the Mona Lisa was painted across 1503 to 1519, not in 1503. A three-second scan caught a fact that the writer would have submitted with full confidence.

FAQ

AI plagiarism checker, frequently asked.

Is the TextSight AI plagiarism checker the same as Turnitin?
No. Turnitin and iThenticate compare your draft against academic databases and the web to find direct or near-direct text matches. TextSight runs locally on the text you paste and analyses style: clichéd phrasings, stock textbook definitions, uncited specifics, and AI-style cadence. The two are complementary. Use TextSight throughout your drafting, then run a database tool like Turnitin or Copyleaks as a final gate if the stakes are high.
Is the AI plagiarism checker free?
Yes. The free tier includes 3 scans a day with no card and no signup. Each scan returns the AI score, the Plagiarism Risk score, sentence-level highlights, and the Authenticity Score in the same pass. Paid tiers raise the per-scan character limit and add file upload, the Chrome extension, and the REST API.
What does the Plagiarism Risk score actually flag?
Three signals. First, clichéd or stock phrasings like "in today's fast-paced world" or "throughout history" that drift in from somewhere your draft never credits. Second, generic textbook-style definitions that appear identically across many sources. Third, specific claims like statistics, dates, and named studies presented without a citation. Output is a 0 to 100 risk score plus a list of flagged passages with the reason next to each one.
Will the checker catch text I copy-pasted from a website?
Often yes, because copy-pasted text usually has a style break from the rest of your writing and triggers AI-style cadence flags. But TextSight does not search the public web for matching paragraphs, so it cannot confirm where the copied text came from. For confirmed source matches against a database, run Turnitin, iThenticate, or Copyleaks on top of a TextSight pass.
How is this different from iThenticate or Copyleaks?
iThenticate and Copyleaks are database-comparison tools. They report a similarity percentage against indexed sources. TextSight reports an AI likelihood band plus a separate Plagiarism Risk score based on stylistic signals in your draft alone. A document can score 0 percent on iThenticate and still flag high on TextSight if the prose is full of clichés or AI-style structure, and vice versa. They measure different things, so treat the scores as complementary lenses.
What is the 4-step workflow?
One, paste your draft into the scanner. Two, read the bundled Plagiarism Risk score, the AI score, and the Authenticity Score in the same pass. Three, review the sentence-level highlights and see why each passage was flagged. Four, revise: add a citation, rewrite the sentence, or cut filler. Re-scan to confirm the score has dropped. Most drafts clear in two passes.
Can I run the checker on a PDF or DOCX file?
File upload is available on Pro and Business. Upload extracts the body text from PDF or DOCX and runs the same AI detection plus Plagiarism Risk pass as a manual paste. Tables, footnotes, and image-only PDFs are stripped or skipped, so a scan-based document needs OCR before upload. Free and Starter tiers accept pasted text only.
Related

More tools in the scan workflow.

Catch the soft stuff before you submit.

Plagiarism Risk score, AI detection, and sentence evidence in one scan. Free to try with no card. 3 scans every day, 5,000 characters per scan.

Run a free scan See pricing
Style triage continuously. Database scan once. Two tools, two jobs.