Head to head · Writing · updated Oct 15, 2026
Turnitin vs Copyleaks
Turnitin scores 12 to Copyleaks's 10 on public evidence for AI content detection, and they rank #1 and #3 there. Only Copyleaks has a free tier. Numbers below are the same public signals the ranking uses, recomputed nightly — nothing here is sponsored.
Turnitin
The dominant academic plagiarism checker, with an AI-writing indicator built into its similarity reports.
+ Already deployed at most universities, so AI scores appear inside the workflow instructors use.
− No individual access, and its AI indicator has led to disputed accusations against students.
Copyleaks
Plagiarism and AI-content detection with LMS integrations and an API, used by schools and enterprises.
+ Supports 30+ languages and integrates with Canvas, Moodle and Blackboard.
− Credit-based pricing is confusing, and false positives on edited human text are common.
Side by side
public evidence| Turnitin | Copyleaks | |
|---|---|---|
| Evidence score / 100 | 12 | 10 |
| GitHub stars | closed source | closed source |
| Hacker News stories, 30d | 2 | 0 |
| Release-feed mentions, 30d | 0 | 0 |
| Last activity | – | – |
| Pricing | Paid · Institutional licensing only | Free tier · AI Detector from $7.99/mo |
| Platforms | web | web, api, chrome-extension |
| Maker | Turnitin | Copyleaks |
Which one?
Pick Turnitin if
- you want the stronger public evidence (12 vs 10)
Best for institution-wide academic integrity.
Pick Copyleaks if
- you want a free tier to start on
- you need it on api, chrome-extension
Best for multilingual detection with LMS integration.