AI Detector by Quillbot

QuillBot’s AI content detector is a tool used for analyzing text to check whether or not it was generated using AI writing software. It looks for writing patterns that are associated with AI, like repetitive or predictable phrases, and then gives a confidence score between 0 and 100% that states the likelihood of the text being AI or human written.

There are two major factors that sets apart QuillBot’s AI detector from other similar tools.

First, it distinguishes how the text was created using AI (whether it was entirely AI-written, entirely human-written, or human-written with some AI refinement). This way, you get a clearer understanding of how your text was created, rather than just told whether or not it was made with AI.

Second, feedback is provided for each section of your writing, so you will always have a clear understanding of which sentences and phrases are flagged for AI writing. This makes the editing process much simpler, as you can save time by focusing primarily on rewriting the flagged sections of your text.

QuillBot’s AI detector works by scanning your text for common AI writing patterns to estimate the probability of it being created using AI. Rather than just providing simple yes-or-no answers, the tool provides a confidence score out of 100 to more precisely indicate the likelihood of it being AI generated.

The patterns that it scans for include predictability, repetition, and structural consistency.

The detector is designed to spot text generated by modern LLMs like GPT-5, GPT-4, Claude, Gemini, and more. Like all AI detectors, the accuracy will vary depending on the length of the text, topic, and how the text was written or edited. Generally, the AI detector is more accurate at evaluating longer pieces of text.

QuillBot’s AI detector is designed to analyze text generated by modern large language models (LLMs). This includes AI models like GPT-5, GPT-4, Claude, Gemini, Llama, and other similar models. Since AI models are always changing and evolving, QuillBot’s AI detector is regularly updated to account for newer AI models and versions. This allows the tool to stay more accurate and effective at spotting AI writing as technology advances.

AI detection is the analysis of writing patterns to estimate whether a piece of text was likely generated using an AI writing tool.

Plagiarism detection, on the other hand, is checking whether a piece of text matches an existing piece of published writing online or in academic databases. It searches online and flags the text if it matches any existing published texts.

In short, AI detection asks “was this likely written by AI?”, while plagiarism detection asks “was this copied from somewhere else?” A piece of writing can be original but AI-generated, or plagiarized without involving AI at all.

Yes, QuillBot’s AI detector can be helpful for teachers by determining the likelihood of whether their students' writing was created using the help of AI writing tools.

Teachers use various different AI detectors for scanning and evaluating student assignments for AI. QuillBot’s AI detector is a great resource for educators to check their classroom work for AI, while also being useful for students who want to make sure their writing assignments are not flagged as being AI-written.

Yes. QuillBot’s AI detector can also help to determine if a piece of writing features a mix of both human and AI writing. Rather than just simply evaluating an entire text as a single block of writing, the tool examines writing patterns line-by-line, identifying and flagging specific sections as being AI-generated.

No. QuillBot’s AI detector can not verify whether a piece of writing was created by a human or original. The tool simply analyzes a piece of text and searches for common AI writing patterns and estimates the probability of it being created with the use of an AI writing tool.

QuillBot’s AI detector is specifically designed to detect AI-generated text. It doesn’t analyze images, videos, or other types of media. If you would like to check whether an image was AI-generated, you can use QuillBot's

AI Image Detector

QuillBot’s AI detector can benefit professionals across many different industries. Educators can use it for evaluating student assignments, while journalists and editors can screen drafts or submissions from other writers. SEO teams and digital marketers can use AI detectors to review web content prior to publishing and maintaining quality across their content pipelines. Researchers and technical writers can use the tool for reviewing reports or documentation, and enterprise teams can utilize it for managing internal or client-facing content.

No, the AI detector is solely used to detect AI writing. QuillBot has many other tools, including a

Grammar Checker

No. QuillBot’s AI detector can help you to scan and find AI-written content within a piece of writing, but it does not scan text for plagiarism. Use our

Plagiarism Checker

Yes. QuillBot’s AI detector supports 20+ languages. This makes it useful for international teams, educators, and publishers working with multilingual writing. Supported languages include English, Spanish, French, Portuguese, and many others.

Yes. While QuillBot’s AI detector focuses on identifying common AI writing patterns within text, it also connects directly with QuillBot’s other writing tools to help refine your flagged content. If sections of text are identified as being likely written by AI, you can quickly improve or adjust the writing by using our integrated tools within the same workflow. For example, you can use QuillBot’s Humanizer tool to rewrite your flagged text sound more natural and align it with your own voice or use the Paraphraser to rewrite sentences to sound more original.

Our AI detector simply identifies and flags text that might be AI-generated, but it is not perfect. Use your best judgment when reviewing results. Never rely on an AI detector alone when making decisions that could impact someone's career or academic standing.

Yes. QuillBot plans to integrate its AI detector directly into QuillBot Chat and browser extensions. This will give users the ability to check text for AI-generated patterns without ever having to leave their primary writing space.