WriteHuman: AI Detector
WriteHuman: AI Detector is a free AI content detector that checks if text was generated by AI models like ChatGPT or Claude, with detailed score reports and confidence breakdown.
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What is WriteHuman: AI Detector?
WriteHuman: AI Detector is a free content analysis tool that identifies whether text was generated by AI or written by a human. It analyzes language patterns, sentence structure, perplexity, burstiness, and stylometric fingerprints to detect AI-generated content from leading models like ChatGPT, GPT-4, Claude, Gemini, and Llama. Users paste their text into the detector and receive instant results with a detailed confidence score report showing AI probability, human probability, and mixed content breakdown.
Key features include multi-model detection that identifies content from various AI systems in a single scan, detailed score reports with per-class confidence levels, instant results in under two seconds, a proprietary human score calculation algorithm, and private secure processing where text is never stored. The tool also integrates seamlessly with WriteHuman's AI Humanizer feature, allowing users to detect AI content and then rewrite it to sound more natural without leaving the page. Every scan provides sentence-level breakdowns highlighting specific sentences driving the score.
This tool is ideal for students checking assignments, bloggers verifying content authenticity, educators detecting AI-written submissions, businesses ensuring marketing material integrity, writers improving their content, and anyone needing to distinguish between AI-generated and human-written text. It works best on long, unedited AI text with accuracy falling off for shorter, paraphrased, or mixed content.
WriteHuman: AI Detector pricing
Pricing model: Paid
Free tier: 3 humanizer requests/month (250 words max), 1 output variation, 10 detection checks/month, 10 image scans/month, basic humanization quality, no MCP access or priority support. Basic plan: $12/mo billed annually ($144/year) - 80 requests/month, 600 words max, 2 variations, 160 detection checks/month, 80 image scans/month, enhanced quality. Pro plan: $18/mo billed annually ($216/year) - 200 requests/month, 1,200 words max, 3 variations, 400 detection checks/month, 200 image scans/month, enhanced quality, MCP access, priority support. Ultra plan: $36/mo billed annually ($432/year) - unlimited requests, 3,000 words max, 5 variations, unlimited detection checks and image scans, enhanced quality, MCP access 1,000/mo, priority support. Every plan includes full access to AI humanizer, AI detector, and image detector. Cancel anytime, no contracts.
WriteHuman: AI Detector pros
- Completely free for daily use with no account required
- Multi-model detection for ChatGPT, GPT-4, Claude, Gemini, and Llama
- Instant results in under two seconds with no queues
- Detailed confidence score report with AI/human/mixed breakdown
- Sentence-level view highlighting specific flagged sentences
- Proprietary human score calculation beyond binary classification
- Private and secure - text never stored or used for training
- Seamless integration with AI Humanizer for one-page detect-and-fix flow
- Shareable results card for sharing detection reports
- Class breakdown showing most-likely source model
- Perplexity and burstiness analysis for deeper insight
- Stylometric fingerprint profiling for function-word frequency and patterns
- No word limit for free users on daily scans
- Real-time processing with immediate results appearance
- Trustpilot verified reviews with 4.1 rating from 238 reviews
WriteHuman: AI Detector cons
- Not 100% accurate - no detector on market is fully accurate
- False positives occur with academic abstracts, legal boilerplate, technical docs
- False negatives when AI text is paraphrased, hand-edited, or humanized
- Short snippets under 150 words fall below meaningful threshold
- Accuracy dips briefly when new frontier models ship before retraining
- Mixed AI-human writing blends signatures and lowers score reliability
- Humanizer output is by design harder to flag regardless of quality
- Highly formulaic prose like code or recipe steps has noisy signal
- 62% score with wide uncertainty band differs from 95% with tight one
- Free tier limited to 10 detection checks per month
Frequently asked questions about WriteHuman: AI Detector
What is WriteHuman AI Detector?
WriteHuman AI Detector is a tool that identifies whether text was written by AI or a human by analyzing language patterns, sentence structure, perplexity, burstiness, and stylometric fingerprints. It uses advanced machine learning trained on large datasets of both AI-generated and human-written content to identify subtle differences and detect content from ChatGPT, GPT-4, Claude, Gemini, and Llama with a single scan.
Is there a free version of WriteHuman AI Detector?
Yes, WriteHuman offers a free version with 10 detection checks per month, 3 humanizer requests per month (250 words max), 10 image scans per month, and basic humanization quality. No account is required for daily scans, and users can start scanning immediately with free scans every day.
How accurate is the AI Detector?
No detector on the market is 100% accurate. Accuracy is highest on long, unedited AI text and falls off as writing gets shorter, more paraphrased, or more mixed. The tool provides confidence readings rather than yes/no verdicts, showing sentence-level breakdowns alongside overall scores. False positives occur with safe-looking human text like academic abstracts, while false negatives happen with paraphrased or humanized AI text.
What AI models can the detector identify?
The detector identifies content from ChatGPT, GPT-4, Claude, Gemini, Llama, and other leading AI models with a single scan. It reports the most-likely source model alongside the overall score by profiling function-word frequency, transition repetition, punctuation distribution, and sentence shape dominance that each model leaves behind.
How do I use the WriteHuman AI Detector?
Paste your text into the detector (at least a few paragraphs, 200+ words is the sweet spot), click Run Detection and wait a few seconds, read the overall AI probability score as a probability not verdict, open the class breakdown and sentence-level view to see which sentences drove the score, and if you get a high score run it through the humanizer to rewrite the text. Most scans finish in 2-5 seconds.
Can I upgrade my WriteHuman plan?
Yes, you can upgrade from the free plan to paid plans starting at $12 per month (billed annually) to access advanced detection and the AI Humanizer feature with enhanced quality. You can also upgrade, downgrade, or cancel anytime with no contracts or surprises. Annual billing saves up to $144/year compared to monthly pricing.
Is my text stored when I use the detector?
No, your text is never stored or used for training. Every scan is processed in real time and discarded after analysis. The tool is private and secure, ensuring your content remains confidential throughout the detection process.
What happens when new AI models are released?
Every time a frontier model ships like GPT-5 or Claude 4, detection accuracy on that model dips briefly because the fingerprint shifts. The community retrains and accuracy recovers. WriteHuman retrains on a rolling cadence so the catalog of detectable models stays current, though there will always be a brief window where the freshest model is hardest to catch.
How do I read the AI probability score?
Treat the single percentage at the top as a probability, not a verdict. Above 70% is a strong signal of AI content, below 30% is a strong all-clear, and the middle range (30-70%) is where you look closer at the sentence-level view. A high score is a strong reason to look more carefully, a low score is a strong reason to trust other signals, and the middle requires reading the sentence-level breakdown.
What patterns do detectors catch versus what slips through?
Detectors usually catch templated openings like 'In today's fast-paced world', uniform sentence rhythm, excessive hedging with 'could/may/often', listicle scaffolding with parallel phrasing, tonal flatness, and 'delve' vocabulary. Patterns that slip through include heavy paraphrasing, short snippets under 150 words, mixed AI-human writing, humanizer output, brand-new model output in first few weeks, and highly formulaic prose like code or recipe steps.