Polygraf AI Detector
Polygraf AI Detector: A free detector with source identification, writing analysis, and browser and API access. Ranked #27 of 45 in AI Content Detection Software by our editors (6.1/10); pricing: Free plan; best for free source-identification and writing analysis.
At a glance
- Editor score6.1 / 10
- PricingFree plan
- Best forFree source-identification and writing analysis
- Free planYes
- Supported languages1
- Founded2021 · Austin, Texas, USA
- Facts checked20 Sep 2026
Where it wins
- Free plan includes AI detection, source detection, and writing analysis
- Identifies likely AI models and highlights AI-written passages
- Available on the web, Chrome, and through API integration
Where it doesn't
- English is currently the supported language
- Advanced features are reserved for paid plans
- Enterprise features use custom pricing
Our verdict on Polygraf AI Detector
Polygraf AI Detector analyzes written content for signs of AI generation or alteration. It is designed for consumers, educators, creators, businesses, and organizations focused on content authenticity, plagiarism, misinformation, and compliance. Results can include human-versus-AI probability scores, likely AI model identification, highlighted AI-written passages, writing characteristics, and a Cognitive Flow Index. The product is available as a web application and Chrome extension, with API integration for custom workflows.
The pricing structure starts with a Free plan that includes AI Detector, Source Detector, Writing Analysis, Cognitive Flow Index, and 2.5K monthly tokens. Standard adds AI Highlighter and Content Humanizer with 150K monthly tokens; the pricing page lists its annual-billing starting price as 8.29. Premium adds Advanced Copyright Detector alongside the Standard features. Enterprise includes custom pricing, unlimited users, audit log and data history, and advanced custom fields. The Free tier is a practical entry point for basic analysis, while teams needing higher usage or broader detection tools move into paid plans.
Polygraf’s breadth is a defining feature: beyond AI-generated content detection, it covers source identification, humanized-text detection, copyright and plagiarism detection, file analysis, writing analysis, and custom API integration. That makes it a fit for workflows that need several content-authenticity checks rather than a single detector. Its platform coverage also supports browser-based and custom applications. However, English is currently supported, so organizations working across multiple languages should consider an alternative with broader language coverage. Choose Polygraf for free access to source identification and writing analysis; avoid it when multilingual analysis is essential.
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Polygraf AI Detector pricing
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Polygraf AI Detector fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Not verified |
| Supported languages | 1 |
| File uploads | Yes |
| API access | Yes |
| Browser extension | Yes |
| Report exports | Not verified |
| Batch scanning | Not verified |
| Deployment | Cloud, Browser extension |
| Platforms | Web, Chrome extension |
| Pricing | Free plan (source) |
| Website | polygraf.ai |
| Facts checked | 20 Sep 2026 |
Alternatives to Polygraf AI Detector
- GPTZeroGPTZero combines document, sentence, paraphrase, and workflow verification tools.9.3
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- Originality.aiA multilingual verifier combining AI detection, plagiarism checks, reports, and automated scanning.8.8
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Also Ranked In
Polygraf AI Detector is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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