author.directory

Paid

Copyscape

copyscape.com

Web plagiarism detection.

Pricing: Per-search
Platforms: Web
Last checked: June 2026

Visit CopyscapeListed in Copyright & DRM

Related tools

All Copyscape alternatives →

Originality.ai / GPTZerooriginality.ai

AI-content + plagiarism detection.

U.S. Copyright Officecopyright.gov

Official US copyright registration.

Compare Copyscape

vs Originality.ai / GPTZero vs U.S. Copyright Office