AI Detector by ContentDetector.AI
A free web-based AI detector that estimates how likely a piece of text was written by AI, with a percentage score and word-count tools for writers, teachers, and editors.
About
AI Detector by ContentDetector.AI is a browser-based tool that analyzes pasted text and reports how likely it is that the text was generated by an AI writing model. It addresses a growing need among educators, editors, and publishers who want a quick, low-friction way to screen submissions, essays, and drafts for machine-written content before reviewing them further.
The tool works by accepting text directly into a web form and returning an AI-probability assessment, typically expressed as a percentage, along with supporting details such as word count. No account is required for basic use, which makes it suitable for occasional checks. It is part of a broader family of text-verification utilities available at contentdetector.ai. As with all AI-detection tools, results are probabilistic estimates rather than proof, so the score should be treated as one signal among several when evaluating a document.
Key Features
Pricing & Fees
- Pricing: Not publicly listed on the pages we reviewed; check the official site for current plans.
- Free access for standard use: The detector is presented as a free tool on the official site, with any paid tiers or limits detailed there.
- Web-based: Runs in a modern browser without downloads or extensions.
- Accuracy caveats apply: AI-detection scores are estimates and can produce false positives or false negatives, especially with edited or short text.
Who It's For
The tool is aimed at teachers screening student essays for AI-written sections, editors and publishers reviewing freelance submissions, and content teams checking drafts before publication. Students and job applicants also use it to verify their own writing does not trip detection filters, while bloggers and marketers use it to review outsourced copy. It suits anyone who needs a fast, no-cost first pass on whether a text may be machine generated, with the understanding that a human should make the final judgment.
FAQ
What is AI Detector by ContentDetector.AI?It is a free web tool that analyzes pasted text and estimates the probability that the text was generated by an AI model, reporting the result as a percentage-style score.
Is AI Detector by ContentDetector.AI free to use?The detector is presented as free for standard use on the official site; details on any paid plans or usage limits are not publicly listed on the pages reviewed, so check contentdetector.ai for current terms.
Do I need to install anything or create an account?No. The tool runs in a web browser and basic checks can be performed by pasting text directly, without installing software.
Can it prove that a text was written by AI?No. AI detection is probabilistic, and results can be wrong in both directions, particularly for short, edited, or mixed human-AI text, so the score should support rather than replace human review.
What kinds of text can it analyze?It works on plain prose such as essays, articles, and blog drafts, and it also reports basic statistics like word count alongside the detection estimate.
Related Tutorials
View all →
Related Tools
View all →
Resemble AI Resemble AI is a multimodal deepfake detection platform that identifies AI-generated audio, video, and images in real time, with watermarking and identity verification for enterprises. 
Clever AI Detector Free online AI text checker — probability scores with sentence-level signals, up to 10,000 words per check, unlimited runs. 
Detect AI Watermarks Product Overview
Detect AI Watermarks is a specialized privacy utility designed to uncover invisible digital fingerprints hidden in AI-generated text. As Large Language Models (LLMs) like ChatGPT and Claude become ubiquitous, they often embed imperceptible "watermarks"—such as zero-width characters 
GPTZero GPTZero is an AI content detector that scans text from models like ChatGPT, Claude, and Gemini, serving educators, writers, and teams verifying originality. 
Winston AI Winston AI is an AI content detector and plagiarism checker that identifies text generated by ChatGPT, Claude, Gemini and other models, with image detection and OCR for educators, publishers and writers.