Turnitin colours rank the Similarity Score by how much of your paper matches other sources: blue means no matching text, green is 1–24%, yellow is 25–49%, orange is 50–74%, and red is 75–100% — but the colour is a triage signal, not a verdict of plagiarism.
Key Takeaways
- In Turnitin Feedback Studio the bands are blue (0%), green (1–24%), yellow (25–49%), orange (50–74%), red (75–100%) — per Turnitin’s own guide.
- In Turnitin Similarity / SimCheck the blue and green bands are reversed — green is 0% and blue is 1–24% — which is why the same paper can look “green” in one system and “blue” in another.
- The colour reflects matching text, not plagiarism. Quoted material, references and common phrases all count toward the percentage.
- There is no universal “safe” colour — acceptable thresholds are set by your instructor or institution, not by Turnitin.
- The Similarity colour is separate from Turnitin’s AI writing indicator, which is a different number entirely.
What do the Turnitin colours mean?
Each submission gets a Similarity Score, and Turnitin wraps that percentage in a colour so instructors can triage a stack of papers at a glance. The colour maps directly to a percentage band. In the standard Feedback Studio view the order runs blue, green, yellow, orange, red as the match percentage climbs, according to Turnitin’s own documentation and university guidance like NCI’s library FAQ.
Feedback Studio similarity bands. Source: Turnitin Guides.
| Colour | Similarity range | What it usually signals |
|---|---|---|
| Blue | No matching text (0%) | Nothing matched the database — rare for a real paper with references |
| Green | 1–24% | Low match; typically quotes, citations and common phrasing |
| Yellow | 25–49% | Moderate; worth reviewing which sources are matching |
| Orange | 50–74% | High; large blocks of text align with existing sources |
| Red | 75–100% | Very high; most of the document matches other sources |
Why does green mean different things in different Turnitin versions?
This is the trap that sends students into a panic. The colour scale is not identical across Turnitin products. In Turnitin Similarity and the older SimCheck integration, the blue and green bands are swapped: green represents 0% matching text and blue represents 1–24%, the exact opposite of Feedback Studio. Turnitin documents both scales in its student guide to the similarity score.
The blue and green bands are reversed between Feedback Studio and Turnitin Similarity / SimCheck.
The practical takeaway: don’t judge your paper by the colour name alone. Read the actual percentage next to it, and confirm which Turnitin interface your institution uses before you assume a green result is good news.
Does the colour mean I plagiarised?
No. The colour and its percentage measure matching text, not academic misconduct. A quoted passage, a properly cited reference list, or a common technical phrase will all raise the number, and none of them is plagiarism. As Boise State’s teaching team puts it in its guide to interpreting the report, the similarity index is a starting point for review, not a plagiarism score.
That’s why a red result isn’t automatically a problem and a green one isn’t automatically safe. What matters is what is matching. If you want to see how a full report breaks down, our walkthrough of what the scores in a detection report really mean shows where to look, and what to check when Turnitin flags your references page covers the single most common false alarm.
What colour counts as a “good” Turnitin score?
There is no official pass mark. Turnitin does not set an acceptable percentage — your instructor or institution does. Guidance published by the University of the Witwatersrand notes that a similarity index has to be interpreted in context rather than against a fixed cut-off, and many departments cite an informal 15–25% comfort zone that is a convention, not a rule.
Because thresholds vary, the colour is best used as a prompt to review your matches, not as a grade. If your score jumped without you changing much, there are a few common reasons a Turnitin score changes overnight.
Is the colour the same as Turnitin’s AI detection score?
No, and conflating the two is a frequent mistake. The Similarity colour measures text matching. Turnitin’s AI writing indicator is a completely separate percentage estimating how much of the text reads as AI-generated, and it does not use the blue-to-red colour scale. We break down how that second number works in our guide to the Turnitin AI checker and what Turnitin’s AI detection actually costs schools. If you have ever seen one section flagged more heavily than another, that is the AI indicator at work, not the similarity colour.
For the wider picture on how reliable these signals are, our data reports on AI detection false-positive rates by tool and detection accuracy across languages are worth a read before you trust any single number.
Before you panic over a colour, run a pre-submission sanity check. See the best pre-submission check for Turnitin AI risk and grab our free premium AI-detection prompts at detectiondrama.com.
Frequently asked questions
What does blue mean on Turnitin?
In Feedback Studio, blue means no matching text was found (0% similarity). In Turnitin Similarity / SimCheck, blue instead means 1–24% matching text, because the blue and green bands are reversed between the two systems.
What does green mean on Turnitin?
In Feedback Studio, green is a low similarity of 1–24%. In Turnitin Similarity / SimCheck, green means 0% matching text. Always read the percentage beside the colour rather than relying on the colour name.
Is a red Turnitin score always plagiarism?
No. Red means 75–100% of the text matched other sources, but that can include quotes, references and boilerplate. It flags text for review; it does not by itself prove plagiarism.
What is a good percentage on Turnitin?
There is no universal figure. Turnitin does not set a threshold — your instructor or institution does. Many use an informal 15–25% comfort zone, but you should confirm your own course’s policy.
Why is my Turnitin colour different from a classmate’s on the same source?
Usually because you are looking at different Turnitin products (Feedback Studio vs Turnitin Similarity), which use opposite blue/green bands, or because exclusion settings for quotes and bibliography differ between assignments.
Does the Turnitin colour include the AI detection score?
No. The colour applies only to the Similarity Score for matching text. Turnitin’s AI writing detection is a separate percentage that does not use the blue-to-red scale.
Can I lower my Turnitin colour before the deadline?
You can reduce matching text by properly quoting and citing, but note Turnitin only regenerates your report immediately for the first three resubmissions; after that you wait 24 hours for a fresh score.
Methodology: colour bands in this guide are taken directly from Turnitin’s published Feedback Studio and Turnitin Similarity documentation and cross-checked against university library guidance (NCI, Boise State, Witwatersrand). Last updated: July 2026.
Detection Drama tests AI-detection and academic-integrity tools hands-on, including Turnitin’s similarity and AI reports across Feedback Studio and Turnitin Similarity.
