Updated March 2026
Compare 8 top AI content detectors. GPTZero, Originality.ai, TextShift, Copyleaks, and more tested on GPT-4, Claude, and Gemini content with real accuracy data.
| Tool | Accuracy (GPT-4) | Free Tier | Price | Best For | Rating |
|---|---|---|---|---|---|
| TextShift | 99.18% | ✓ 5,000 words | $9.99/mo | All-in-one | 9.5/10 |
| GPTZero | 98% | ✓ 10K chars | $10/mo | Education | 9.0/10 |
| Originality.ai | 96% | ✗ | $14.95/mo | Publishers | 8.8/10 |
| Copyleaks | 95.2% | ✓ Limited | $9.99/mo | Enterprise | 8.5/10 |
| Sapling | 93% | ✓ Basic | $25/mo | Teams | 8.2/10 |
| Winston AI | 92% | ✓ 2K words | $12/mo | Writers | 8.0/10 |
| ZeroGPT | 88% | ✓ Unlimited | Free | Quick checks | 7.5/10 |
| Content at Scale | 90% | ✓ 2,500 words | $49/mo | SEO content | 8.0/10 |