T-Checker

Turnitin AI Detector is a free web tool that checks essays, research papers, and academic drafts for AI-like writing. You paste your text, run the check, and get an AI probability score, a risk level, and sentence-level highlights showing which passages may need review. The page states that no signup is required.

The tool is aimed at students, teachers, and academic writers who want to review a draft before submitting it or discussing it with others. The page describes use cases such as school essays, college papers, literature reviews, discussion posts, reflections, and scholarship or application drafts. It presents the score as a writing review signal rather than a final verdict.

The page explains the score ranges, from mostly human-like at 0 to 30 percent up to very strong AI-like signals at 81 to 100 percent, along with suggested next steps for each range. It also lists patterns the checker looks for, including repetitive sentence structure, predictable phrasing, generic academic tone, low writing variation, mechanical transitions, and unnatural paragraph flow.

What sets it apart, according to the page, is its focus on fast, practical checks with clear sentence-level feedback for academic writing. The FAQ notes that results can vary with text length, writing style, and editing history, so it should be used as one reference among others.