What the sentence highlights mean
Red, yellow and unmarked sentences, the probability behind each one, and why a few highlights in human writing are normal.
Updated Sep 18, 20261 min read
Below your score, the report shows your text with each sentence marked by how machine-like it reads. We score every sentence on its own, then weigh them together for the document score.
- Red: likely AI. The sentence closely matches patterns we see in model output.
- Yellow: mixed. There's some signal, but not enough to call it either way.
- No highlight: reads as human.
Hover over or tap a sentence to see its probability. Select a sentence to keep it in focus while you scroll, which helps when you're talking a result through with someone.
Why one sentence isn't enough
Single sentences are short, and short text is hard to judge. Stock phrases like “it is important to note” turn up in human writing too. What matters is a pattern: several highlighted sentences in a row, a sudden change of voice, or a whole section that reads differently from the rest.
Choosing what reports open on
In Settings, turn on Open reports on sentence highlights to land on the marked-up text instead of the score. If you share reports with students or clients and want them to focus on specific passages, turn on Hide scores in shared reports as well.