ContentDetector.org vs It's AI

ContentDetector.org is a free tool that estimates whether text was AI-written and reports a percentage split between AI-written and human-written content. Users can paste text, upload a file, or submit a URL for a report with a score, section highlights, and review guidance. The site says the detector evaluates token-pattern predictability, semantic repetition, formatting regularity, and local stretches of uniform phrasing, including patterns associated with GPT-5, Gemini, Claude, and other large models. It also offers a converter that rewrites AI-generated text to improve tone, flow, clarity, and sentence variety; the converter page shows a 1000-character input counter. Other listed options include API access and bulk checks of folders or URL lists. Platforms include web, extension, iOS, macOS, and Windows. The site says inputs are not used to train models and describes retention controls; its FAQ says inputs are removed when the tab is closed, while the converter page says submitted content is processed instantly and not stored. It warns results can be wrong, especially for very short or heavily edited text, and recommends human review.

It's AI estimates whether text may have been written by a language model, including content associated with ChatGPT, Gemini, Claude, Grok, and other models. It also offers plagiarism, grammar, and spelling checks. Users can paste text or upload PDF, DOCX, and TXT files; the displayed limits are 200 to 500,000 characters. Deep Scan highlights sentences that appear AI-generated and provides a word heatmap showing which parts influence the score. Listed integrations include an API, Chrome Extension, ChatGPT Plugin, Python SDK, Canvas LMS, and Zapier; Moodle is marked as coming soon. The service is presented for teachers, students, institutions, and publishers, as well as writers, managers, recruiters, and ML engineers. It also offers enterprise API access and batch processing. The FAQ advises treating results as evidence alongside context, not as sole proof of AI use, and says content is not shared with third parties after checks are complete. The free plan is listed at free. Plus is listed at $84 a year, billed at $84/year and shown as $7 and $9/month with annual savings.