Turnitin
Turnitin checks submitted writing for plagiarism and AI generation by comparing text against web pages, scholarly journals, and previous submissions. Feedback Studio provides inline grading and annotations, with report access managed directly through integrated course platforms.
#29 in Writing & Translation ToolsPlagiarism CheckersAI DetectorsNo free plan
Who it's for
Best for
Schools that need a shared plagiarism check on every submission
Teachers who grade and comment inside their course system
Not for
Students hoping to check their own paper first
Anyone who needs an AI score they can trust on its own
Free planNo
Institution licenseCustom
Features
Similarity check
Compares each submission with web pages, published articles, and prior academic submissions, then highlights matching passages.
AI writing detection
Estimates how much of a submission looks AI-generated and marks the passages it thinks were written or rewritten by AI.
Feedback Studio
Provides inline grading, custom comments, and reusable feedback marks directly on submitted papers.
Match filters
Excludes quotes, bibliographies, and minor text matches from the overall similarity score.
Course system add-ons
Integrates with learning platforms such as Canvas, Moodle, and Blackboard for automated assignment submissions.
What users say
Pros
- Catches copied text reliably, even when original wording has been disguised with synonyms.
Cons
- AI detection flags genuinely original writing as synthetic text, triggering false academic integrity accusations.
- Similarity reports flag properly cited quotes, footnotes, and standard phrasing as matches, inflating overall similarity scores.
- Glitches can lose typed work or grading comments, or block a submission for days.
- After a detection update, older rewording tricks stop working; lowering the AI score takes repeated rewrite-and-recheck loops.
- Genuine manual rewrites often barely reduce the AI detection score.
- Fake Turnitin lookalike sites and ersatz checkers are widespread, so scores from unofficial sources are untrustworthy.
A selection of the review sources we used:
Summarized from public user reviews and community discussions. View details
Global Traffic Rank
Top 5k
Alternatives
Rank#29 in category#12 in category#17 in category#18 in category
Free planNoYesYesYes
ProCatches copied and disguised text reliablyCatches edited AI text and shows a human, mixed, AI splitEarly red flags, clear reports, per-article checks, AI detectionHandy citation tool, explained proofreading, solid checks
Better forChecking drafts on a free or individual plan and spotting invented citations before submission.
Weaker atMatching against past student papers or grading directly inside a school course system.