AI Detector - Unlimited Free AI Checker for ChatGPT, Gemini & More
Analyze articles, essays, and documents for AI-generated content across GPT-5 (Instant & Thinking), Gemini 3 (3.6 Flash & 3.1 Pro), Claude 3.5/3.7, and Llama 3. Inspect model likelihoods, sentence burstiness, syntactic perplexity, and visual heatmaps.
✓ 100% Free & Unlimited
✓ 100% Browser Local & Private
✓ No Registration Required
How to use AI Detector - Unlimited Free AI Checker for ChatGPT, Gemini & More Online
- Step 1: Paste your article, essay, or research paper into the text editor.
- Step 2: Review the overall AI probability score, multi-model attribution breakdown (GPT-5, Gemini 3, Claude, Llama), and sentence risk analysis.
- Step 3: Toggle Heatmap mode to visually highlight flagged sentences and identify generative reasoning patterns.
Frequently Asked Questions
Is this AI detector completely free to use?
Yes! Checkistan provides 100% unlimited, free AI detection with no word limits or signup required.
Which AI models can this tool detect?
It detects content generated by OpenAI GPT-5 (Instant & Thinking) & GPT-4o, Google Gemini 3 (3.6 Flash & 3.1 Pro), Anthropic Claude 3.5/3.7, and Llama 3.
Does it keep my text private?
Yes, all text analysis runs 100% securely inside your browser session and is never stored on external servers.