ProseGuard
ProseGuard is an AI content detection API that analyzes text to determine whether it was written by a human or generated by AI. It goes beyond simple probability scores — it shows you exactly why text looks AI-generated or human-written, down to the individual sentence level. Publishers, educators, content platforms, and hiring managers all need to verify content authenticity. ProseGuard gives…
ProseGuard endpoints
| Method | Endpoint | Description |
|---|---|---|
| POST |
AI Detection /api/v1/detect |
Full AI detection analysis. Returns AI probability (0-100), label (ai_generated, likely_ai, mixed_or_uncertain, likely_human, human_written), confidence score, and detailed… |
| POST |
Quick Detection /api/v1/detect/quick |
Lightweight AI detection — returns just the AI probability, label, and confidence. Use this for high-volume scanning where you don't need the full signal breakdown. |
| POST |
Sentence Detection /api/v1/detect/sentences |
Per-sentence AI detection. Flags each sentence individually as AI, human, or uncertain with specific flags showing what triggered the detection. Great for finding AI-written… |
| POST |
Batch Detection /api/v1/detect/batch |
Analyze up to 20 texts at once. Returns AI probability and label for each. Perfect for scanning submissions, reviews, or content queues in bulk. |
| POST |
Writing Patterns /api/v1/analyze/patterns |
Analyze sentence-level writing patterns. Returns sentence length uniformity (AI writes more uniform sentences), starter diversity, AI-typical starter percentage, and paragraph… |
| POST |
Vocabulary Analysis /api/v1/analyze/vocabulary |
Analyze vocabulary complexity and patterns. Returns type-token ratio, word length averages, complex word percentage, hapax legomena ratio (words used only once — AI uses fewer),… |
| POST |
Style Fingerprint /api/v1/analyze/style |
Generate a writing style fingerprint. Returns punctuation usage patterns, contraction rate, first/second person usage, sentence type distribution, formality score (0-100), and… |
| POST |
Repetition Analysis /api/v1/analyze/repetition |
Analyze repetitive patterns typical of AI writing. Returns top repeated words with density, repeated phrases, sentence similarity rate, consecutive starter repeats, and a… |
| POST |
Compare Texts /api/v1/compare |
Compare two texts for authorship similarity and AI probability. Returns vocabulary overlap, sentence length comparison, formality comparison, AI probability for both, and whether… |
| POST |
Humanize Score /api/v1/humanize-score |
Score how natural and human-like text sounds on a scale of 0-100 with a letter grade (A-F). Returns specific factors that make it sound human or AI, plus actionable tips to make… |
| POST |
Full Report /api/v1/report |
Generate a comprehensive AI detection report. Runs every analysis module and returns AI probability, all detection signals, AI and human markers found, sentence patterns,… |
ProseGuard pricing
| Plan | Price | Rate limit | Quotas |
|---|---|---|---|
| BASIC | Free | — |
|
| PRO Recommended | $19.99 / month | 10 / second |
|
| ULTRA | $59.99 / month | 25 / second |
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| MEGA | $179.99 / month | 60 / second |
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