Copyleaks

API

API that detects AI-generated text and checks text and code for plagiarism

Price: Paid credits; free mock sandbox
Access: API key exchanged for a 48-hour token

About

Copyleaks' REST API classifies text as human or AI-written in 30+ languages and scans text, files and source code for plagiarism against the web and private repositories, with results by webhook. Credit prices are not published; a sandbox returns mock results for free.

What you can do with it

Detect whether an essay or article was written by ChatGPT, Gemini or Claude
Check student papers or articles for plagiarism and paraphrasing against the web
Find out whether submitted source code was copied from the web or your repositories

Get started

Log in with your email and API key to get an access token
POST text to /v2/writer-detector/{scanId}/check
Set "sandbox" to true for free mock results while testing

Example

# $COPYLEAKS_TOKEN comes from POST https://id.copyleaks.com/v3/account/login/api
curl -X POST https://api.copyleaks.com/v2/writer-detector/my-scan-123/check \
  -H "Authorization: Bearer $COPYLEAKS_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"text": "At least 255 characters of text to check...", "sandbox": true}'

Details

Hosting: Hosted service
Available in: Worldwide
Official SDKs: Python, JavaScript/TypeScript, Java, C#, PHP, Ruby
MCP server: Remote