Turnitin Color Meanings: Blue, Green, Yellow, Orange & Red
Understand blue, green, yellow, orange, red and purple on Turnitin: similarity score bands depend on the product, source highlights identify matches, and AI detection is separate.
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The same colour can mean different things in Turnitin. First check whether you are looking at a similarity score, a source number beside matched text, or a separate AI Writing Report. A blue highlight in a PDF is not the same thing as a blue similarity icon.
Quick answer: Turnitin colour meanings
In the default Feedback Studio inbox, blue means no matching text; green means some matching text up to 24%; yellow is 25–49%; orange is 50–74%; red is 75–100%. These are similarity bands, not plagiarism decisions.
| Colour | Feedback Studio / Originality Check | Similarity / SimCheck |
|---|---|---|
| Blue | No matching text | 1–24% |
| Green | Some matching text, up to 24% | 0% |
| Yellow | 25–49% | 25–49% |
| Orange | 50–74% | 50–74% |
| Red | 75–100% | 75–100% |
Turnitin documents both schemes in its similarity score guide. Integrations may differ. In Feedback Studio, a small match can round to 0% while still showing green: the displayed percentage and “no matching text” are not always interchangeable.
What You Actually See When You Open a Turnitin Report
A Similarity Report compares text with sources. An AI Writing Report assesses likely AI writing. They answer different questions. A green similarity result does not mean “human-written,” and a high similarity result does not establish AI use.
For a complete walkthrough, use our Similarity Report guide. For AI results, use How to Read a Turnitin AI Writing Report.
Where the Colours Actually Appear
In the Assignment Inbox
A colour beside the overall similarity percentage can represent one of the score bands above. Check the product and integration before interpreting blue or green.
Inside the Report: Turnitin Highlight Colours Meaning
A coloured passage with a source number can simply identify a matching source. Match the number to the source list. The colours can repeat; they do not rank the seriousness of copying. A report with a low overall percentage can contain blue, green or purple source highlights.
In the enhanced report, the active view also matters: Match Groups uses colours for citation and quotation categories, while Sources uses rotating source colours. Turnitin explains this distinction in its enhanced report navigation guide.
Similarity Reports Do Not Show AI Writing Highlights
Do not use the similarity PDF to diagnose AI writing. AI results belong to a separate report. Follow its heading and legend rather than borrowing a colour meaning from another screen.
Each Colour Band Explained (Feedback Studio Inbox)
Blue (0%): No Matching Text Found
In this inbox scheme, blue means no matching text was found. It is not proof of authorship or a guarantee that every source was acknowledged. Review the submitted file and assignment requirements. A displayed 0% can also reflect rounding when a report contains very small matches.
Green (1% – 24%): Normal Territory
Green is a lower similarity band in Feedback Studio, not a universal acceptable score. Check whether the matches are quotations, references, common phrases or substantive passages requiring attribution. A low overall percentage can still contain an important unattributed passage. In Similarity/SimCheck, green instead denotes 0%.
Yellow (25% – 49%): Worth a Closer Look
Yellow means 25–49% in the default schemes above. It is not automatically bad. Read the largest matches and check whether bibliography, quoted material or assignment templates are included. Your institution determines what is acceptable for the task.
Orange (50% – 74%): High Match — Expect Scrutiny
Orange indicates a large amount of matching text. Possible explanations include templates, extensive quotations, a previous draft or substantial copied material. The percentage does not tell you which explanation applies. Review the sources and ask your instructor about legitimate exclusions.
Red (75% – 100%): Investigation Territory
Red is the highest similarity band in these schemes. It calls for understanding the matches, not an automatic misconduct conclusion. A previous submission can cause a strong self-match. Check the file, matched sources and submission history with your instructor before making another submission.
The Big Caveat: Colour Is Not Plagiarism
A colour cannot establish whether a passage is properly attributed, whether reuse is allowed, or whether an assignment template should be excluded. Neither a low score nor a high score settles those questions.
Match Groups can help locate citation issues, but its classification is also automated. “Not Cited or Quoted” is a prompt to inspect the passage, not a misconduct finding. Integrity Flags similarly identify issues for review rather than decide the outcome.
What Does Purple Mean on Turnitin?
Purple is not a sixth similarity score band. If it appears beside a numbered source in a Similarity Report, it can be a source identifier with no AI meaning.
Older AI-report guides described separate cyan and purple AI categories. Turnitin’s current English report uses a unified AI-generated category, so that old colour explanation should not be applied to every report. Read the label in the report you have. See the AI report reading guide for current results and older layouts.
What to Do Before You Hit Submit
- Read your assignment’s source-use and AI-use rules.
- Check direct quotations and in-text references against the original sources.
- Review matched passages and the report’s exclusion settings, rather than chasing a colour.
- Keep your drafts, notes and source records.
- If you need AI checking, request the separate AI report. Contact Purply for an AI check and help interpreting the result; a check cannot guarantee a future institutional score.
Frequently Asked Questions
What does green mean on Turnitin?
In Feedback Studio it means some matching text up to 24%; in Similarity/SimCheck it means 0%. It is not a pass or a human-authorship certificate.
Is yellow on Turnitin bad?
Yellow is a similarity band, not a misconduct decision. Review the matched sources and your assignment rules.
What does blue mean on Turnitin?
A blue score icon and blue highlighted text are different things. The icon depends on the product; a numbered blue passage can simply identify a source.
What percentage is red on Turnitin?
75–100% in the default schemes discussed here. That percentage measures matching text, not the probability of plagiarism or AI use.
Does purple mean AI-generated?
Not in a Similarity Report. Check whether it is a numbered source colour or part of a separate AI report, and follow that report’s legend.
Where can I learn how to read the AI report?
Use our Turnitin AI Writing Report guide. If you cannot see a result, see why the AI score may not be showing.
Need Help Reading Your Turnitin Report?
Contact Purply for an AI check and help interpreting the result. Tell us whether you need AI detection, similarity checking, or both. A pre-check cannot guarantee a later institutional result.
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