ToolForgeby ForgeSparse
Powered by RoBERTa · Real ML · Not a Chatbot

Free AI Detector Tool

Real machine learning detection — not an LLM guessing. Sentence-level scores powered by roberta-base-openai-detector, specifically trained for AI content detection.

RoBERTa
Detection Engine
Real ML
Not LLM Opinion
Free
No Signup Needed
Paste Your Text
0 words
Detection Result

ML analysis results will appear here

Awaiting your text
Real ML Model
RoBERTa fine-tuned for AI detection — not a chatbot guess
Sentence-Level Scores
Every sentence scored independently by the ML classifier
Privacy-First
No account required. Text sent only to HuggingFace API
Free & Open Source
Powered by OpenAI's open-source detector model

Why people love our AI detector

Trusted by students, educators, editors, and content teams worldwide.

"

The AI tool I use the most

I spend every day drafting, creating, and editing content. ForgeSparse saves me a ton of time. The sentence-level breakdown is incredibly accurate and gives me real confidence before submitting work.

Whitney W.
"

Great assistant for my students

I really love how this tool assists me when reviewing student submissions. It checks each sentence individually so I can see exactly which parts are likely AI-generated. It gives me confidence in my evaluations.

Patricia D. B.
"

Accurate results like no other

It gives me accurate results that no other AI checker gives. I spent time writing my coursework myself, and ForgeSparse correctly gave me 0% AI — while other checkers flagged it. Finally a tool I can trust.

Oriya

Supporting writers at top institutions

Used by students, faculty, and professionals at leading universities and organizations worldwide.

IIT Bombay
Stanford
MIT
Oxford
NUS
Corvinus University
Stellenbosch
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What is an AI Detector?

An AI detector (also called an AI checker or AI content detector) analyzes text to evaluate how likely it was generated by AI. It searches for patterns common to AI-generated text and determines how likely it is the writer used a platform like GPT-4, GPT-5, or Claude. AI content detection is used by educators, editors, SEO professionals, and businesses to make sure content is original.

The AI Detector that stays ahead of AI

ForgeSparse is continuously updated to account for emerging patterns in AI-generated text as AI evolves — staying ahead of identifying typical AI tells and flagging patterns you may not realize indicate AI.

Trained on the latest LLMs

Stay ahead of the curve with our model updated regularly to scan for new patterns from GPT-5, Claude, Gemini, and other LLMs as they evolve.

Transparent results

Get clear scores and sentence-level explanations to help you understand exactly why text may be flagged as AI-generated.

Multilingual support

Work with AI-generated text across multiple languages — not just English. Detect AI content globally.

Instant detection

Get results in seconds, allowing you to review text without slowing down your workflow.

Privacy-first design

Keep your text secure, so your sensitive or unpublished content stays protected. No data stored on our servers.

Insights and explanations

Avoid using patterns and commonly AI-generated phrases to help you avoid being flagged in the future.

More clarity,
less confusion

Paraphrasing and grammar checking tools help millions of writers refine text and express their ideas. But most AI checkers can't differentiate between text that's been entirely generated with AI tools and text that's been refined using AI assistance.

ForgeSparse offers a more reliable AI Detector — powered by a purpose-built ML classifier, not a chatbot being asked to guess. Sentence-level scoring means you see exactly what's flagged and why.

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Sample Analysis
Recent advancements in quantum computing have sparked interest across scientific and technological communities. Quantum computers utilize quantum bits, or qubits. We spent three years building this prototype in our university lab, mostly fueled by bad coffee and curiosity.
20 / 1,200 words
75%
of text is likely AI
AI-generated
75%
Human-written & AI-refined
15%
Human-written
10%
Plagiarism Checker
46%
Plagiarism detected
46% Similar words
VS
AI Detector
44%
of text is likely AI
AI-generated
44%
Human & AI-refined
14%
Human-written
42%

What's the difference between an AI detector and a plagiarism checker?

An AI detector checks if content was likely generated by AI. A plagiarism detector checks if content was copied from somewhere else.

A piece of writing can be original but AI-generated, or copied from another source without involving AI. Using both tools together helps evaluate authenticity and originality.

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How to use ForgeSparse's AI Detector

No account. No word limit. Real ML results in under 60 seconds.

1
1

Input Text

Upload or paste your text and make sure it's at least 20 words to improve accuracy of the ML classifier.

2
2

Run Scan

Press 'Detect AI' to receive a sentence-level report on the likelihood your text was generated by AI.

3
3

Review the Results

Check out the colour-coded sentence heatmap to understand which content was flagged and why.

4
4

Edit and Share

Rewrite sections flagged as AI-generated if needed, then copy or export your detection report.

AI Detector FAQs

Everything you need to know about our free AI detection tool.

An AI detector is a tool that analyzes text to determine whether it was written by a human or generated by an AI model such as ChatGPT, Claude, or Gemini. ForgeSparse uses a real machine learning model — RoBERTa — specifically trained on AI-generated vs human-written text for genuine detection, not guesswork.
ForgeSparse AI Detector is powered by roberta-base-openai-detector, a RoBERTa-based model fine-tuned by OpenAI specifically to classify AI-generated text. It was trained on GPT-2 outputs and human writing from WebText, making it one of the most reliable open-source AI detectors available.
The underlying RoBERTa model achieves high accuracy on GPT-2 and similar AI-generated text. Because it is a purpose-trained classifier rather than a language model being asked to guess, results are more reliable than LLM-based approaches. However, no detector is 100% accurate — humanized or heavily edited text may score lower.
Yes. ForgeSparse splits your text into individual sentences and runs the ML model on each one independently. This gives you a colour-coded sentence-level breakdown showing exactly which parts of your text are likely AI-generated.
Yes. Text is sent to the Hugging Face Inference API for classification and is not stored on ForgeSparse servers. No account is required.
Yes, ForgeSparse AI Detector is 100% free. No sign-ups, no word limits, and no subscription required.
An AI detector checks if content was likely generated by AI. A plagiarism detector checks if content was copied from somewhere else. A piece of writing can be original but AI-generated, or copied from another source without involving AI. Using both tools together helps evaluate authenticity and originality.
Yes. Because ForgeSparse scores every sentence independently, it can identify mixed content where some sentences are AI-generated and others are human-written. The sentence-level heatmap makes it easy to see exactly which parts of the text are flagged.