Grammarly
by Grammarly Inc.
Free
The most widely used writing assistant — grammar, tone, and AI rewrites.
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Best Plagiarism Detection
Tools that check writing for originality against published sources.
PaperRater
by PaperRater LLC
Free
Free academic proofreader with AI-powered grammar check and plagiarism detection.
ProWritingAid
by Orpheus Technology Ltd.
Free
Deep writing analysis with 20+ reports for serious writers and authors.
QuillBot
by Course Hero
Free
AI paraphrasing tool with seven rewrite modes and a plagiarism checker.
WhiteSmoke
by WhiteSmoke Ltd.
$5/mo
Multi-language grammar checker with a built-in translator for 55 languages.