Turnitin ranks #1 for aI writing and plagiarism detection (score 8.2/10). Pricing: Unverified; free tier: Unverified. Runners-up: GPTZero, Copyleaks.
Top 5, ranked by our published rubric. Sponsorship never affects the order. Last updated 2026-10-13.
| # | Tool | Score | Pricing | Paid from | Free tier | What it is |
|---|---|---|---|---|---|---|
| 1 | Turnitin | 8.2 | Unverified | Unverified | Unverified | Academic integrity and AI writing detection |
| 2 | GPTZero | 7.4 | Unverified | Unverified | Unverified | AI writing detection |
| 3 | Copyleaks | 7.1 | From $13.99 | Personal $13.99/mo ($167.88/yr billed annually) | unknown | AI content and plagiarism detection |
| 4 | Grammarly | 7.0 | Free tier | Pro $12/mo | yes | AI writing assistant |
| 5 | Originality.ai | 6.2 | From $12.95 | Pro $12.95/mo billed yearly | no | AI content and plagiarism checker |
Academic integrity and AI writing detection
Why ranked: Its own site says: “Turnitin solutions promote academic integrity, streamline grading and feedback, deter plagiarism, and improve student outcomes.” We placed it 1st of 5 on fit for this task. Pricing unverified.
Fit 10.0 · value 5.0 · breadth 6 · availability 10 (how we score) · no readable pricing page · site live
AI writing detection
Why ranked: Its own site says: “Best free AI detector - simply paste your text to instantly get an overall AI score and advanced sentence by sentence detection.” We placed it 2nd of 5 on fit for this task. Pricing unverified.
Fit 8.5 · value 5.0 · breadth 6 · availability 10 (how we score) · no readable pricing page · site live
AI content and plagiarism detection
Why ranked: Its own site says: “Verify originality with Copyleaks' AI detection, the only AI-based platform used by millions worldwide to ensure text authenticity and protect intellectual property.” We placed it 3rd of 5 on fit for this task. No free plan confirmed; paid from Personal $13.99/mo ($167.88/yr billed annually).
Fit 7.0 · value 6.9 · breadth 6 · availability 10 (how we score) · pricing source · site live
AI writing assistant
Why ranked: Its own site says: “Grammarly makes AI writing convenient. Work smarter with personalized AI guidance and text generation on any app or website.” We placed it 5th of 5 on fit for this task. Free tier; paid from Pro $12/mo.
Fit 4.0 · value 10.0 · breadth 10 · availability 10 (how we score) · pricing source · site live
AI content and plagiarism checker
Why ranked: Its own site says: “Use the accurate Originality.ai AI detector to identify if text was generated from a popular AI platform like ChatGPT, Gemini, Claude, Grok and others.” We placed it 4th of 5 on fit for this task. No free plan confirmed; paid from Pro $12.95/mo billed yearly.
Fit 5.5 · value 6.2 · breadth 6 · availability 10 (how we score) · pricing source · site live
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By TaskRanking's published rubric, Turnitin ranks first, followed by GPTZero and Copyleaks.
Yes: Grammarly has a free tier per its own pricing page (checked 2026-10-13).
Score = 50% fit, 25% value (from vendor pricing pages), 15% breadth, 10% availability. Sponsorship never affects rank.
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