Best Alternatives to Copyleaks
Detect plagiarism and AI-generated content across documents, websites, and code in 100+ languages. Our comprehensive comparison helps you find the perfect AI detection alternative based on pricing, features, privacy, and workflow requirements. We've hand-picked the top-rated tools with strong free tiers and proven user satisfaction.
Quick Comparison
| Tool | Pricing | Best For |
|---|---|---|
| GPTZero | free | Detect AI-generated text in documents and submissions with s... |
| Verva (formerly TwainGPT) | freemium | TwainGPT is now Verva. It rewrites AI-generated text to redu... |
| LanguageTool | free | Multilingual AI writing assistant correcting grammar, spelli... |
| PaperRed | free | Free AI plagiarism checker for Chinese students with AIGC de... |
| Decopy AI | free | Detects AI-generated text, humanizes content, and includes t... |
GPTZero
Detect AI-generated text in documents and submissions with sentence-level analysis and detailed probability reports.
Verva (formerly TwainGPT)
TwainGPT is now Verva. It rewrites AI-generated text to reduce detection by GPTZero, Turnitin and Copyleaks across 100+ languages, and now ships an AI detector alongside the humanizer.
LanguageTool
Multilingual AI writing assistant correcting grammar, spelling, style across 30+ languages with browser extensions and desktop apps.
PaperRed
Free AI plagiarism checker for Chinese students with AIGC detection, similarity reduction, and AI-assisted academic writing.
Decopy AI
Detects AI-generated text, humanizes content, and includes tools like YouTube summarizer and math solver for original writing.
Onfido
Onfido is now part of Entrust: onfido.com redirects to Entrust identity verification. The AI KYC capability - document, selfie and biometric checks - continues under Entrust branding.