Estimate AI authorship with burstiness analysis. Check a 400-word essay scoring 72 percent AI likelihood, free offline, no signup.
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Approximate 70 percent accuracy via burstiness, variance and lexical rarity; unsuitable for disciplinary rulings. For example, 400-word essays with uniform 18-word sentences score 72 percent AI due flat rhythm. Require 150-plus words for stability.
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Supply minimum 150 words; sub-50-word fragments lack variance for reliable judgment of burstiness. For example, 400-word samples reveal sentence-length distributions reliably with 18-word averages. Brief captions and headlines inevitably mislead and warrant exclusion from scoring entirely, requiring 150-plus words for stability and 70 percent confidence.
Override whenever stakes involve grading, hiring and publication where false positives harm reputations. For example, 72 percent likelihood still admits human authorship. Interview authors, request drafts and examine process evidence before conclusions.
Paraphrasing injects burstiness and rare diction, depressing uniformity metrics that detectors track. For example, mixed short punchy and extended explanatory sentences mimic human cadence with varied 8-25 word lengths. Heuristics lag adversarial editing, necessitating provenance practices and draft histories for verification.
Infer likely machine authorship through sentence-length burstiness, variance breadth and uncommon vocabulary proportions for triage across classrooms, newsrooms and content teams. Analyze 400-word essays displaying 72 percent likelihood when 18-word uniformity prevails. Reference table maps cues: high burstiness mixed 5-28 words equals human lean | low burstiness uniform 18 words equals machine lean | rare words abundant equals human | repetitive transitions equals machine | sub-50 words equals unreliable. Example one screens admission essay: uniform syntax scores 72 percent prompting interview. Edge handling ignores headings, normalizes quotations and discounts code blocks. Instructors prioritize reviews, editors verify pitches and managers audit vendors systematically.
Human prose alternates terse fragments with sprawling explanations, while synthetic drafts maintain metronomic 18-word cadence with predictable connectors. Low variance and lexical scarcity elevate percentages; 150-plus words stabilize distributions. Example two contrasts blogs: human travelogue bursts 6 to 29 words scoring 28 percent, AI summary holds 17-19 words scoring 74 percent. Edge intricacies involve non-native writers exhibiting low burstiness innocently, technical templates constraining variance legitimately and heavily edited hybrids confounding binaries. Rewrite by varying lengths, inserting anecdotes and deploying idioms. Document limitations, avoid sole reliance and corroborate via provenance every assessment. Committees establish policies, trainers educate ethics and reviewers combine signals.
Load 400-word sample, note 72 percent bar with low-variance warning, examine uniform 18-word rhythm, revise with bursts then rescan observing decline. Heuristic scope excludes proof, source attribution and watermark verification. Academic misconduct demands human adjudication. For local 5-gram uniqueness scoring with 96 percent benchmarks and source comparison, continue with our originality scanner at /plagiarism-checker to complement authorship triage. Archive reports and revision histories quarterly.