Head to head · Writing · updated Oct 25, 2026
Copyleaks vs GPTZero
Copyleaks scores 10 to GPTZero's 10 on public evidence for AI content detection, and they rank #3 and #4 there. Both are free to start. Numbers below are the same public signals the ranking uses, recomputed nightly — nothing here is sponsored.
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.
GPTZero
An AI-text detector for educators with sentence-level highlighting and a writing-process report.
+ Highlights which sentences look AI-generated and offers a Google Docs writing replay as supporting evidence.
− Like all detectors it produces false positives, particularly on non-native English writers.
Side by side
public evidence| Copyleaks | GPTZero | |
|---|---|---|
| Evidence score / 100 | 10 | 10 |
| GitHub stars | closed source | closed source |
| Hacker News stories, 30d | 0 | 0 |
| Release-feed mentions, 30d | 0 | 0 |
| Last activity | – | – |
| Pricing | Free tier · AI Detector from $7.99/mo | Free tier · Essential from $8.33/mo billed annually |
| Platforms | web, api, chrome-extension | web, chrome-extension, api |
| Maker | Copyleaks | GPTZero |
Which one?
Pick Copyleaks if
Supports 30+ languages and integrates with Canvas, Moodle and Blackboard.
Best for multilingual detection with LMS integration.
Pick GPTZero if
Highlights which sentences look AI-generated and offers a Google Docs writing replay as supporting evidence.
Best for classroom AI-writing checks.