Turnitin vs GPTZero vs Originality AI – Which Detector Should Students Use to Self-Check?

Before I submit anything now I run it through an AI detector first. Call it paranoia but after my roommate got called in for an academic integrity meeting over a paper she wrote entirely herself I am not taking chances.

The question is which detector should I actually trust? My school uses Turnitin so ideally I want something that gives similar results. But the Turnitin AI detection tool isnt available to students directly.

I have been using GPTZero and Originality AI. GPTZero is free and decent but I have noticed it gives different scores if you check the same text twice. Originality AI costs money per scan but seems more consistent.

Has anyone found a detector that closely matches what Turnitin flags? That would be the most useful since thats what actually matters for grades.

Also curious if running your text through a detector and then editing the flagged parts is a legitimate strategy or if that crosses some ethical line.