GPTZero vs Turnitin
- Only GPTZero has a free plan.
- GPTZero charges per seat; Turnitin (AI writing detection) quotes through sales.
| Detail |  GPTZero |  Turnitin (AI writing detection) |
|---|---|---|
| What it does | AI writing detector with sentence highlighting, plagiarism checks, writing replay and classroom integrations. | Institution licensed similarity checker with an AI writing and AI paraphrase indicator built into LMS workflows. |
| Best for | Teachers and students checking essays for AI | Universities enforcing academic integrity |
| Free | 10,000 words/ | No free plan |
| Cheapest paid | $14.99 a month, $8.33 billed yearly | Not published |
| Billing | Per seat | Contact sales |
| API | Yes | Yes |
| Runs on | Web, Browser extension, api | Web, api |
| Status | Active | Active |
| Visit | Visit GPTZero GPTZero (opens the tool's site) | Visit Turnitin (AI writing detection) Turnitin (AI writing detection) (opens the tool's site) |
GPTZero plans
| Plan | Monthly | Billed yearly | Per | What it includes |
|---|---|---|---|---|
| Free | Free | $0 | per account | 10,000 words/month, basic + advanced AI scans, Chrome extension |
| Essential | $14.99 | $8.33 | per user | 150,000 words/month, plagiarism check |
| Premium | $23.99 | $12.99 | per user | 300,000 words/month, batch uploads |
| Professional | $45.99 | $24.99 | per user | 500,000 words/month per member; team version min 2 seats |
| Institutional / Enterprise | Contact sales | Not listed | custom | contact sales; LMS (Canvas) integrations, API |
From GPTZero's pricing page, checked . Full GPTZero listing
Turnitin (AI writing detection) plans
| Plan | Monthly | Billed yearly | Per | What it includes |
|---|---|---|---|---|
| Institutional license (Turnitin Originality / Feedback Studio) | Not listed | Not listed | per institution | contact sales; third party estimates ~$5,000–$20,000/yr, AI add on ~$0.41–$0.48 per student/yr |
From Turnitin (AI writing detection)'s pricing page, checked . Full Turnitin (AI writing detection) listing
We don't declare a winner: the right one depends on what you'll use it for and how much. Every fact above is from each tool's own pages; we earn a commission from neither of them.