Everything about
the AI Detector.

Forgely's AI Detector sends your text to Claude, an advanced AI model, with a detailed analytical prompt. The model evaluates the text for linguistic patterns associated with AI writing — uniform sentence lengths, formal filler transitions, Latinate vocabulary, absence of contractions, parallel structures, and hedging phrases. It returns a probability score, a verdict, and identifies which specific sentences showed the strongest AI patterns.

The detector looks for six reliable AI writing tells: uniform sentence lengths across the passage, overuse of formal filler transitions like 'Furthermore' and 'Moreover,' preference for Latinate verbs ('utilize' over 'use,' 'facilitate' over 'help'), systematic absence of contractions, parallel list structures presented as prose, and hedging phrases like 'It is worth noting that' or 'This highlights the importance of.'

Forgely detects AI writing patterns regardless of the source model. It works on text from ChatGPT (GPT-3.5, GPT-4, GPT-4o, GPT-5), Claude, Google Gemini, Microsoft Copilot, Llama, Mistral, Grok, and any other large language model — because it analyzes linguistic patterns in the text itself, not a digital fingerprint tied to a specific model.

After analysis, Forgely displays your original text with specific sentences highlighted in orange. These highlighted sentences are the ones the AI identified as most strongly exhibiting AI writing patterns. This makes the reasoning transparent — instead of just getting a number, you can see exactly which parts of the text drove the score.

Detection typically completes in 5–15 seconds depending on text length and server load. The analysis is performed by an AI model, which takes slightly longer than a simple algorithm — but the result is more nuanced and includes the sentence-level highlighting that makes the output genuinely useful.

The detector is accurate on clearly AI-generated text — it reliably flags the linguistic patterns AI models consistently produce. It is less reliable on short texts under 100 words, text that has been heavily edited after AI generation, and text written by humans who naturally write in a formal academic style. For best results, paste at least 150 words.

Yes — all AI detectors can be fooled. Heavily edited AI text, very short passages, and text intentionally written to mimic human patterns will score lower. The detector is a signal, not a certainty. A 90% score is strong evidence; a 40% score is ambiguous. Always use the result as one data point alongside other context, not as a definitive verdict.

Yes. Humans who write in a formal, academic style — heavy use of passive voice, formal transitions, precise vocabulary — may trigger AI detection signals even though they wrote the text themselves. Students, academics, and professionals writing in formal registers are most at risk of false positives. A high score does not prove AI authorship.

Paste at least 150 words for reliable results. Shorter texts do not provide enough linguistic data for confident pattern analysis. The detector works best on 200–1,000 word passages where writing patterns have enough space to manifest consistently.

The detector is designed for prose — natural language writing. Code, tables, and structured markup do not contain the prose-level linguistic patterns the tool analyzes. Running non-prose content through the detector will produce unreliable results. Stick to natural language: articles, essays, emails, reports, and similar text.

The detector is optimized for English. It may produce results on other languages because the underlying model (Claude) is multilingual, but accuracy of AI pattern detection for non-English content is not guaranteed. For non-English text, treat results with additional caution.

The score is a 0–100 percentage representing how strongly the text exhibits AI writing patterns. 0–30 means the text reads like human writing with few AI signals. 31–60 means mixed signals — some AI patterns present but not conclusive. 61–100 means the text shows strong, consistent AI writing characteristics.

Three plain-English verdicts: 'Likely Human' (score 0–30) — text shows few AI writing patterns; 'Mixed Signals' (score 31–60) — some AI patterns present but evidence is not conclusive; 'Likely AI-Generated' (score 61–100) — text shows strong, consistent patterns associated with AI writing.

A high score on genuinely human-written text means your writing style matches patterns AI models produce — usually from formal academic or business writing habits. Try adding contractions, varying sentence lengths, using simpler vocabulary, and replacing transition phrases like 'Furthermore' with more natural connectors. Running your text through the AI Writing Polisher can also help introduce more varied human patterns.

The detector's output is a probabilistic assessment, not a fact. Use the sentence highlights to understand which specific phrases triggered the score and consider editing those sections to introduce more natural, varied phrasing. No AI detector is infallible.

Yes — completely free. No account, no subscription, no credit card. Paste up to 1,000 words and get your AI probability score, verdict, and sentence-level highlighting instantly.

The free AI Detector supports up to 1,000 words per check. For documents longer than 1,000 words, divide them into sections and check each section separately. The 1,000-word limit covers most individual blog posts, essays, emails, and article sections.

No. Forgely's AI Detector requires no account, no email, and no credit card. It works immediately from any browser on any device.

Currently the AI Detector is a free tool with a 1,000-word limit per check. There is no paid Pro tier for the detector at this time. For documents longer than 1,000 words, check them in sections.

No. The AI Detector checks for AI writing patterns only — it does not compare your text against a database of existing content to check for plagiarism or copyright infringement. For plagiarism checking, use tools like Copyscape, Turnitin, or PlagScan.

No. Your text is sent to the AI for analysis and the result is returned — nothing is stored in a database. Forgely does not retain your content, does not log submissions, and does not use your text for training AI models.

Text you paste is processed by the Claude API, subject to Anthropic's privacy policy which prohibits using customer data for training. As with any web-based tool, avoid pasting proprietary trade secrets or personally identifiable information you are not authorized to share with a third-party API.

GPTZero requires an account and limits free usage. Forgely is completely free with no account required. Forgely also provides visible sentence-level highlighting that shows exactly which parts triggered detection, making the reasoning transparent. GPTZero uses perplexity and burstiness measurements; Forgely uses AI-powered qualitative pattern analysis.

Originality.ai is a paid service ($0.01 per 100 words) targeted at content agencies needing bulk detection with team accounts and plagiarism checking. Forgely is free and designed for individual use. For personal document checking, Forgely is faster and costs nothing. For bulk commercial checking at scale, Originality.ai offers more infrastructure.

Turnitin is an institutional tool available to schools and universities via subscription — individual users cannot access it directly. It combines plagiarism detection with AI writing detection. Forgely is free, individual-facing, requires no institution subscription, and is available to anyone immediately. They serve very different audiences and use cases.

Content teams use AI detectors to verify that freelance writers are delivering original human writing as contracted, ensure brand voice consistency (AI writing has a flat, generic quality that dilutes distinctive brand voices), check content before publishing for editorial standards, and audit past content for compliance with updated AI policies. Sentence-level highlighting makes it easy to identify which specific passages need review.

You can use it as one input when reviewing student work, but use it thoughtfully. No AI detector is accurate enough to serve as sole evidence of academic dishonesty. A high score should prompt a conversation — asking students to explain their process, walk through their draft, or answer questions about the content — not automatic punishment. Use detection as a starting point for investigation, not a conclusion.

Detection alone is not a reliable enforcement mechanism. Determined users can employ AI humanizers to lower detection scores significantly. Effective no-AI policies rely on clear communication of expectations, process-based assignments (outlines, drafts, revisions), in-person or verbal components, and detection as one signal rather than the sole enforcement method.

No. AI detection scores are probabilistic signals, not proof. Multiple professional bodies, including the US National Council of Teachers of English, have cautioned against using AI detector scores as evidence of academic dishonesty without additional context. Use detection results as a starting point for investigation, not a conclusion.

Three steps: (1) Copy up to 1,000 words of text and paste it into the text box on the AI Detector page. (2) Click 'Detect AI Writing' — analysis completes in 5–15 seconds. (3) Read your 0–100 AI probability score, the plain-English verdict, and review the highlighted sentences that showed the strongest AI patterns.