Perusall has no built-in AI-writing detector. It scores annotations for thoughtfulness, relevance to the text, and engagement with classmates, which is a different measurement than checking whether the words came from a model. A school can still run a Turnitin or Copyleaks integration on top of Perusall, but that is a separate, optional layer, not something Perusall does on its own.
Can Perusall detect AI writing?
Not on its own. Perusall is a social annotation platform: students read a shared document or video and leave comments in the margins, and Perusall's automatic scoring algorithm rates those comments so instructors do not have to grade every annotation by hand. That algorithm looks at whether a comment engages with a specific passage, whether it shows genuine thinking, and whether it invites or responds to classmates. None of that is an AI-detection signal.
What does Perusall's own scoring actually measure?
Three things, per Perusall's own documentation: thoughtfulness, meaning the comment shows real engagement rather than a one-line reaction; relevance, meaning it is anchored to a specific passage rather than generic; and engagement with peers, meaning replies and questions that build a conversation. A smooth, well-written annotation can score well on all three even if a detector would flag its prose as machine-like, because the two systems are measuring completely different things.
Can a school still check Perusall annotations for AI with Turnitin or Copyleaks?
Yes, if the school has that integration enabled. Perusall does not include AI detection itself, but institutions can connect a separate service, most commonly Turnitin or Copyleaks, to scan submitted work, annotations included, the same way they would scan a Canvas or Schoology assignment. Whether that is switched on for a given course is a setting the school controls, not something built into Perusall by default.
The mechanics of that kind of integration, and why a course-level toggle matters more than the LMS brand, are covered in more depth in does Canvas use Turnitin to detect AI writing, which walks through the same assignment-level check from a different platform.
How do you find out if your course checks annotations for AI?
Check your syllabus for any mention of Turnitin, Copyleaks, or AI-detection policy on discussion or annotation participation specifically, not just on formal essays.
Ask your instructor directly. Whether an integration is enabled is a course-level setting, and most instructors will say plainly whether they use one.
Do not assume a smooth, well-scored annotation is safe from a manual check. An instructor who suspects AI use can always copy the text into a detector themselves, integration or not.
The underlying signals any detector scores, on Perusall or anywhere else, are the same perplexity and burstiness measurements explained in how ChatGPT detectors work.
If your own writing habitually reads as too smooth or too uniform and you want a second opinion before it becomes a problem, our free AI detector is a reasonable first check.
How this was made: Perusall's scoring algorithm and its lack of native AI detection were confirmed against Perusall's own product documentation and help resources via search 2026-08-18. Drafting is AI-assisted, with a person verifying the mechanism and its sourcing before publishing.
Frequently asked questions
Does Perusall have a built-in AI detector?
No. Perusall's own algorithm scores annotations for thoughtfulness, relevance, and peer engagement. It does not analyze text for statistical patterns associated with AI-generated writing the way a dedicated detector does.
Can my professor still catch AI-written annotations on Perusall?
Yes, in two ways: a school-enabled Turnitin or Copyleaks integration running automatically, or an instructor manually copying suspicious text into a detector themselves. Neither depends on Perusall having its own detection feature.
Will a well-written annotation score higher on Perusall even if it came from ChatGPT?
Possibly on Perusall's own thoughtfulness and relevance score, since that measures engagement with the text rather than authorship. It would not necessarily score well on a separate AI detector, which measures a completely different set of signals.
How do I know if my school uses Turnitin or Copyleaks with Perusall?
Check your syllabus for a mention of either tool, or ask your instructor directly. It is a course-level setting that varies by school and by class, not a universal Perusall feature.
