AI Content Detector - Detect ChatGPT, Claude, Gemini & AI-Generated Text

Detect AI-generated text using advanced statistical analysis. This AI text detector analyzes writing patterns, sentence structure, vocabulary diversity, and linguistic markers to determine if content was written by a human or generated by AI models like ChatGPT, Claude, Gemini, GPT-4, Llama, or other large language models. No external API key needed — runs entirely on statistical analysis.

Features

• No API key required — Pure statistical analysis, no external dependencies
• Instant results — Analyzes text in milliseconds via Standby mode HTTP API
• 9 detection signals — Sentence uniformity, burstiness, vocabulary diversity, AI phrases, sentence starters, readability, paragraph structure, repetitive patterns, punctuation
• Confidence scoring — 0-100 AI score with high/medium/low confidence ratings
• Verdict classification — ai_generated, likely_ai, mixed, likely_human, or human_written
• Bulk analysis — Analyze up to 20 texts in a single request
• Detailed breakdown — See exactly which signals triggered and why
• Works for all AI models — Detects patterns common to ChatGPT, Claude, Gemini, GPT-4, Llama, Mistral, and more
• Real-time API — Use as a fast HTTP API endpoint via Apify Standby mode

How It Works

This AI content detector uses 9 statistical signals to identify AI-generated text:

Signal	What It Measures	Why AI Differs
Sentence Uniformity	Variation in sentence lengths	AI produces uniform lengths
Burstiness	Dramatic changes between sentences	Humans are more "bursty"
Vocabulary Diversity	Type-token ratio	AI hits a predictable middle range
AI Phrase Density	Known AI transition phrases	AI overuses "furthermore", "delve", "crucial"
Sentence Starters	How sentences begin	AI uses predictable starters
Readability	Flesch-Kincaid grade level	AI targets grade 10-14 consistently
Paragraph Structure	Paragraph length consistency	AI creates uniform paragraphs
Repetitive Patterns	Structural repetition	AI repeats syntactic patterns
Punctuation Patterns	Comma usage patterns	AI uses commas very consistently

Input

Field	Type	Description
text	String	Single text to analyze (min 30 characters)
texts	Array	Multiple texts to analyze in bulk (max 20)

Input Example

{
  "text": "The rapid advancement of artificial intelligence has fundamentally transformed the way we approach complex problem-solving across various domains."
}

Bulk Input Example

{
  "texts": [
    "AI has transformed how we work and live in the modern world.",
    "lol i cant believe the game last night was so crazy my friend was screaming"
  ]
}

Output

{
  "text": "The rapid advancement of artificial intelligence has fundamentally...",
  "ai_score": 82,
  "human_score": 18,
  "verdict": "ai_generated",
  "confidence": "high",
  "word_count": 145,
  "sentence_count": 6,
  "details": {
    "scores": {
      "sentence_uniformity": { "score": 78, "weight": 15 },
      "burstiness": { "score": 85, "weight": 12 },
      "vocabulary_diversity": { "score": 72, "weight": 10, "ttr": 0.621 },
      "ai_phrases": { "score": 90, "weight": 20, "ai_phrases_found": 8, "examples": ["furthermore", "crucial role", "various domains"] },
      "sentence_starters": { "score": 65, "weight": 10 },
      "readability": { "score": 88, "weight": 8, "grade_level": 12.3 },
      "paragraph_structure": { "score": 70, "weight": 8 },
      "repetitive_patterns": { "score": 55, "weight": 10 },
      "punctuation_pattern": { "score": 80, "weight": 7 }
    },
    "text_stats": {
      "avg_sentence_length": 24.2,
      "sentence_length_std_dev": 3.8,
      "vocabulary_diversity_ttr": 0.621,
      "avg_syllables_per_word": 1.82,
      "flesch_kincaid_grade": 12.3,
      "commas_per_sentence": 2.1,
      "paragraph_count": 2
    }
  }
}

Verdict Scale

AI Score	Verdict	Meaning
80-100	ai_generated	Very likely written by AI
60-79	likely_ai	Probably AI with some human elements
40-59	mixed	Could be either, or AI-assisted human writing
20-39	likely_human	Probably human-written
0-19	human_written	Very likely written by a human

Use Cases

• Academic integrity — Check student submissions for AI-generated content
• Content verification — Verify that blog posts, articles, and reports are human-written
• SEO compliance — Detect AI content that may be penalized by search engines
• Hiring — Verify cover letters and writing samples are authentic
• Publishing — Screen submissions for AI-generated manuscripts
• Social media — Detect AI-generated comments and bot accounts
• Journalism — Verify sources and submissions are genuinely human-written

API Endpoints (Standby Mode)

Use the actor in Standby mode for real-time API access:

POST /detect

curl -X POST "https://YOUR-STANDBY-URL/detect" \
  -H "Content-Type: application/json" \
  -d '{"text":"Your text to analyze here..."}'

GET /detect

$curl "https://YOUR-STANDBY-URL/detect?text=Your+text+to+analyze"

POST /detect/bulk

curl -X POST "https://YOUR-STANDBY-URL/detect/bulk" \
  -H "Content-Type: application/json" \
  -d '{"texts":["First text","Second text"]}'

Pricing

Pay-per-event pricing:

• $0.003 per text analyzed
• No charge for failed or insufficient text requests
• Bulk analysis charges per text in the batch

Limitations

• Statistical analysis only — Does not use ML models, so accuracy depends on text length and quality
• Best with 100+ words — Short texts (under 50 words) get low confidence ratings
• English-optimized — AI phrase detection is currently optimized for English text
• Not 100% accurate — No AI detector is perfect; use as one signal among many
• AI-assisted writing — Text that was AI-generated then heavily edited may score as "mixed"

Tips for Best Results

1. Submit longer texts — 200+ words gives the most accurate results
2. Submit raw text — Don't clean or format the text before analysis
3. Multiple samples — Analyze several paragraphs from the same source for a pattern
4. Use bulk mode — Compare multiple texts from the same author

Related Tools

• Email Validator API — Verify email addresses with MX, SMTP, and disposable checks
• Website Intelligence API — Detect technologies, analyze SEO, extract metadata

Browse all tools by george.the.developer on Apify.