ContentDetector.org

Overview

The detector returns an estimated AI-versus-human percentage, section highlights, and guidance for reviewing the text. Those highlights give publishers, educators, and other reviewers a way to focus attention beyond the headline score. The score remains an estimate: the site warns that results can be wrong, particularly on very short or heavily edited text, and recommends human review.

ContentDetector.org says its scoring considers predictable token patterns, semantic repetition, formatting regularity, and localized stretches of uniform phrasing. It evaluates patterns associated with GPT-5, Gemini, Claude, and other large models. That breadth may make it useful as an initial screening step, but the stated signals are not a guarantee of reliable identification.

Key features

Detection and review

Users can paste text, upload a file, or submit a URL. The report’s section-by-section highlights and review guidance make it more actionable than a percentage alone, especially when a team needs to decide what to examine closely. They do not remove the need to read the underlying text and apply judgment.

Converter and bulk checks

The AI-to-human converter rewrites AI-generated text to improve tone, flow, clarity, and sentence variety. Its input counter reaches 1,000 characters, so it is better suited to short passages than long-form rewriting. For larger workflows, the homepage describes document uploads, API access, and bulk checks across a folder or URL list; those options are more relevant to teams processing multiple items than to occasional individual checks.

Privacy and support

The homepage says inputs are not used to train models and that retention can be controlled through workspace settings. Its FAQ says detection inputs are kept only as needed to produce a report and removed when the tab closes; the converter page says submissions are processed instantly and never stored. The contact page offers email, phone, and a form, with a promise to respond as soon as possible.

Pricing

The Free plan is free and includes AI content detection and the AI text converter, which accepts up to 1,000 characters. A free plan makes it practical for occasional checks or short rewrites without a subscription, while the converter cap limits its usefulness for longer passages. No paid plan is part of the stated offering.

Platforms

ContentDetector.org is available on the web, iOS, macOS, and Windows, and offers a browser extension. API access and batch scanning extend the fit to teams with repeat or multi-document workflows, while the browser extension gives users another way to reach the service. The platform range is broad, though the core limitation remains the uncertainty of detector results.

Who it's for

The service identifies publishers and SEO teams, agencies, educators, and learning-and-development teams as intended users. It is best for people who need an initial signal, report highlights, and occasional short-form rewriting in one free service. It is a poor fit when a decision about authorship must rest on a definitive score or when the rewriting task regularly exceeds 1,000 characters.

Pros and cons

• Useful report context: Section highlights and review guidance help direct attention beyond an overall percentage.
• Flexible intake and scale: Text, files, URLs, API access, and folder or URL-list checks support both one-off and team workflows.
• Free detection and rewriting: The Free plan combines both functions at no charge.
• Short converter allowance: The 1,000-character cap makes the converter less suitable for longer writing.
• Scores need corroboration: Short or heavily edited text may be misclassified, so a result cannot stand in for human review.

Alternatives

For a wider comparison, see AI Content Detectors.

AI Detectors.io is another free-plan option if its monthly 10,000-word allowance, daily credit, and 500-word-per-use limit better suit a reader’s checking pattern.

GPTZero may suit readers who want a free 10,000-word monthly allowance and a free trial of its paid tier.

It's AI is an alternative for readers who value a free 4,000-word allowance, file upload, and three deep scans.

Originality.ai offers a free basic option with three scans per day, up to 2,000 words per scan, and document uploads, which may fit readers prioritizing those limits.

Pangram may be a better match for readers who need a free daily word allowance, image-detection scans, OCR, or Google Docs integration.

Proofademic may fit readers seeking a free 1,000-word option that also includes multilingual detection, plagiarism checking, and report export.

TrustOriginality.ai is an alternative for readers whose needs fit one free text analysis per month.

Winston AI is another option for readers who want a free 14-day trial with AI content and image detection and document and OCR scanning.

Verdict

Choose ContentDetector.org if you want no-cost AI-text estimates, review-oriented reports, and a short converter, with options for browser, API, and batch use. Look elsewhere if you need longer rewriting or a score that can establish authorship conclusively: the converter is capped at 1,000 characters, and the detector itself calls for human review.