The most accurate AI content detector and humanizer. Identify text from ChatGPT, GPT-4, Claude, Gemini, and 8+ AI models with 98% accuracy. Sentence-level analysis. Instant results.
Our multi-layered detection engine uses 4 advanced analysis methods to deliver industry-leading accuracy
Simply paste or type any text you want to analyze. We support content of any length, from short paragraphs to full documents.
Our engine runs 4 simultaneous checks: perplexity scoring, burstiness measurement, vocabulary diversity analysis, and sentence structure evaluation.
Every sentence is individually scored and categorized as AI-generated, human-written, or mixed, giving you granular insight into your text.
Get a comprehensive report with percentage scores, visual gauges, highlighted sentences, and actionable metrics you can understand and trust.
ProoforAI identifies content generated by every major AI writing tool and large language model on the market
GPT-4o, GPT-4.5, GPT-4, GPT-3.5
Claude 4, 3.5 Sonnet, 3 Opus
Gemini 2.0 Flash, 1.5 Pro, Ultra
Llama 4, 3.3, 3.1, 3
DeepSeek-V3, R1, Coder
Grok 3, 2, xAI Models
Mistral Large, Medium, Small
Microsoft Copilot, Designer
Qwen 2.5, 2, 1.5
Perplexity Pro, Search
Jasper AI, Boss Mode
Command R+, R, Aya
+ Many more models including StableLM, Falcon, Phi, Command-R, and emerging AI tools
Beyond basic detection — a complete AI content analysis platform built for professionals
Every sentence analyzed individually with color-coded results. Know exactly which parts of your text are AI-generated, human-written, or mixed — not just an overall score.
Perplexity, burstiness, vocabulary diversity, and sentence structure analysis work together to deliver 98% accuracy. No single metric tells the whole story — our combined approach does.
Transform AI-generated text into natural, human-sounding writing. Our humanizer replaces formal AI patterns with conversational alternatives, varied rhythms, and authentic style.
Get comprehensive analysis in under 2 seconds. No waiting, no queues. Paste your text and get instant, detailed results with visual gauges and highlighted sentences.
Detect content from ChatGPT, GPT-4, Claude, Gemini, Llama, Copilot, Jasper, Perplexity, Mistral, and more. We continuously update our detection for new AI models.
Your text is never stored, shared, or used for training. Analysis happens in real-time and your content is immediately discarded after processing. Complete confidentiality guaranteed.
Start free and scale as you grow. No hidden fees, no surprises.
Join 50,000+ users who trust ProoforAI for AI content detection
“ProoforAI has transformed how I check student submissions. The sentence-level detection is incredibly accurate and saves me hours every week.”
“We switched from GPTZero to ProoforAI and haven't looked back. The humanizer feature is a game-changer for our editorial workflow.”
“The accuracy is unmatched. I've tested it against 5 other detectors and ProoforAI consistently catches what others miss.”
“As a writer, I need to make sure my content passes AI checks. ProoforAI gives me confidence that my humanized text reads naturally.”
“The detailed metrics like perplexity and burstiness help me understand why content is flagged. Much better than a simple percentage.”
“We process thousands of articles monthly. ProoforAI's speed and accuracy make it the only tool that keeps up with our demands.”
Join 50,000+ professionals who trust ProoforAI for accurate, fast, and detailed AI content analysis. Start free — no credit card required.
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