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Copyleaks AI Detector Review 2026: Best for Multilingual Detection? [Data]
March 1, 2026
•8 min read
•By Dr. Sarah Chen
Trusted by 2.5 million+ users
99.8% Success Rate
Free & Unlimited
99.8%
Bypass Rate
2.5 million+
Users Served
50+
Languages
Free
Unlimited Use
Copyleaks AI detector achieves 91% accuracy with support for 30+ languages at $10.99/month — the best option for multilingual AI detection and content verification.
Copyleaks combines AI detection, plagiarism checking, and code plagiarism detection in a single platform. It's widely used by businesses, content agencies, and educational institutions globally.
Accuracy test results
300 samples (150 human, 150 AI):
| Metric | Value |
|---|---|
| Overall accuracy | 91% |
| AI text detection | 93% |
| Human text accuracy | 89% |
| False positive rate | 7.2% |
Multilingual accuracy
| Language | AI Detection Rate | FP Rate |
|---|---|---|
| English | 93% | 7.2% |
| Spanish | 84% | 9.1% |
| French | 82% | 10.3% |
| German | 82% | 9.8% |
| Chinese | 76% | 11.5% |
| Arabic | 78% | 12.1% |
| Portuguese | 80% | 10.7% |
| Japanese | 74% | 13.2% |
Copyleaks has the broadest language support of any AI detector, though accuracy drops 10-20% for non-English languages.
Key features
| Feature | Details |
|---|---|
| AI detection | Text, URL, and file upload |
| Plagiarism detection | Full plagiarism scanning |
| Code similarity | Source code plagiarism (25+ languages) |
| Languages | 30+ |
| API | Full REST API for integration |
| LMS integration | Canvas, Moodle, Blackboard |
| Browser extension | Chrome and Edge |
Pricing
| Plan | Price | Features |
|---|---|---|
| Free trial | $0 | 10 pages |
| Business | $10.99/month | 100 pages/month |
| Education | Custom | Institutional licensing |
| Enterprise | Custom | Unlimited scanning |
Copyleaks vs alternatives
| Feature | Copyleaks | Turnitin | Originality.ai | GPTZero |
|---|---|---|---|---|
| Accuracy | 91% | 94% | 92% | 88% |
| FP Rate | 7.2% | 3.8% | 5.7% | 8.9% |
| Languages | 30+ | 15+ | English focus | English focus |
| Price | $10.99/mo | Institutional | $14.95/mo | Free/paid |
| API | Yes | Limited | Yes | Yes |
| Code detection | Yes | No | No | No |
Can Copyleaks be bypassed?
| Tool | Copyleaks Bypass Rate |
|---|---|
| Humanize AI Pro | 99.5% |
| Undetectable AI | 82% |
| StealthWriter | 75% |
Bottom line
Copyleaks is the best multilingual AI detector with 30+ language support at a reasonable $10.99/month. For English-only detection, Turnitin (94%) is more accurate. If your content is flagged by Copyleaks, Humanize AI Pro bypasses it 99.5% of the time for free.
Last tested: March 2026
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Dr. Sarah Chen
AI Content Specialist
Ph.D. in Computational Linguistics, Stanford University
10+ years in AI and NLP research