CheckAIContent

CheckAIContent is an AI text detector that checks writing from ChatGPT, Gemini, Claude and other AI models for AI-generated patterns, alongside tools for rewriting, tone changing and grammar checking. It is built for teachers, writers and SEO teams who need to verify whether a piece of text was AI-written or to polish it afterward.

A user pastes text or uploads a DOCX or PDF file, and the detection engine analyzes sentence structure, perplexity, burstiness and other linguistic patterns to estimate how AI-like the writing is. Results come back as a human-probability score with sentence-level highlights, and the same workspace offers an AI paragraph rewriter, a tone changer and a grammar checker for the same text.

CheckAIContent reports 98.7% detection accuracy and 99.9% uptime, with analysis in about 2 seconds, and is used by more than 50,000 users. Beyond detection, it includes a paragraph rewriter for clearer or shorter text, a tone changer covering professional, friendly, formal and casual voices, a grammar checker with US and UK English variants, an AI humanizer, an AI essay checker for academic integrity, and a teacher-focused detector for student submissions.

CheckAIContent is offered free to use and does not require signup, and its privacy policy states that user data is never used to train external AI models. It is delivered as a web tool with no app installation needed, and its SEO Tools Hub groups the detector, humanizer, rewriter, tone changer, content checker, grammar checker, essay checker and teacher detector together for different workflows.

Use cases

• A teacher verifying student essays for academic integrity
• Checking content for SEO best practices alongside AI signatures
• Routing writers through detection, rewriting, tone adjustments and grammar QA