Arena Performance
Benchmark Methodology
QuillBot was evaluated on a curated dataset of 0 images, including models like Midjourney, Stable Diffusion, DALL-E 3, Flux, and others. The dataset also includes real photographs from verified sources to measure false positive rates.
All detectors are tested under identical conditions using the same images. We record each detector's classification (AI or Real) and confidence score, then compute three key metrics: Accuracy (percentage of correct predictions), False Positive Rate (real images incorrectly flagged as AI), and False Negative Rate (AI images missed by the detector).
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See the Difference
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Portrait Photo
Street Photography
AI Art
Digital Illustration
What is QuillBot AI Image Detector?
QuillBot, widely known for its paraphrasing and grammar checking tools, also offers an AI Image Detector that analyzes uploaded images to determine whether they were created by artificial intelligence or captured by a human. The tool uses a proprietary machine learning model (ai-image-detector-1.0.1) to provide a confidence score indicating the probability of AI generation.
As part of the QuillBot ecosystem, the image detector is accessible to both free and premium users, making it one of the more accessible AI image detection tools available.
How QuillBot AI Image Detection Works
Machine Learning Model
- Proprietary detection model (ai-image-detector-1.0.1) trained to identify AI-generated images
- Confidence scoring from 0 to 1, where higher scores indicate higher AI probability
- Fast processing — results are returned within seconds of upload
Simple Upload Process
- Upload an image directly through the web interface
- The image is analyzed server-side by QuillBot's detection model
- Results include an AI probability score and usage tracking
Supported Formats
- PNG, JPEG, and other common image formats
- Standard web image sizes supported
Key Features
Free Access
QuillBot offers free image detection checks, making it accessible for casual users who need quick AI image verification without a subscription.
Integration with QuillBot Ecosystem
The image detector is part of QuillBot's broader AI tools suite, which includes:
- AI text content detector
- Paraphraser
- Grammar checker
- Plagiarism checker
User-Friendly Interface
- Simple drag-and-drop or click-to-upload interface
- Clear visual presentation of results
- No technical knowledge required
Pricing Model
- Free tier — Limited number of checks per account
- Premium — $8.33/month (billed annually) with higher limits across all QuillBot tools
- No separate pricing for image detection — included in the general QuillBot plan
Use Cases
- Students and educators — Verifying image authenticity in academic submissions
- Content creators — Checking whether stock images are AI-generated
- Social media users — Quick verification of suspicious images
- Journalists — Initial screening of image authenticity
Limitations
- Detection model version (1.0.1) may not cover the newest AI generators
- Limited number of free checks per account
- Requires user registration to access the detector
- No public API — detection is available through the web interface only
- Less established in image detection compared to specialized tools like Hive or SightEngine
Comparison with Alternatives
| Feature | QuillBot | SightEngine | Hive | Winston AI |
|---|---|---|---|---|
| Image Detection | Yes | Yes | Yes | Yes |
| Free Tier | Yes (limited) | 500/month | No | 2,000 credits |
| Public API | No | Yes | Yes | Yes |
| Text Detection | Yes | No | Yes | Yes |
| Confidence Score | 0-1 | 0-1 | 0-100% | 0-100 |
Our Benchmark Results
We independently test QuillBot's AI Image Detector against multiple AI generators including Midjourney, Stable Diffusion, DALL-E, Flux, and others. View our detailed benchmarks to see how QuillBot performs compared to other detection tools.
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