About AI Detector Free
A browser-based AI text detector built on peer-reviewed research. Free forever, private by design, no account required.
What This Tool Is
AI Detector Free is a browser-based AI text detector that uses 12 linguistic algorithms to check whether text was written by an AI model like ChatGPT, Claude, Gemini, Grok, or DeepSeek.
Every algorithm runs as JavaScript in your browser. Your text is never sent to a server. There is no API call. There is no account. There is no cost.
The tool is built on patterns identified in peer-reviewed research — not heuristics someone made up. The primary research basis is Kobak et al. (Science Advances, 2025), which identified specific vocabulary words that spiked dramatically in published writing after ChatGPT's November 2022 launch.
Why We Built It
Most AI detectors charge $18–$30/month to run a single API call that costs $0.002. We didn't think that was right.
The detection signals — vocabulary density, sentence burstiness, transition patterns, closing rituals — are documented in published research. You don't need a language model to check for them. You need a well-implemented JavaScript algorithm.
So we built one. And made it free. Because the detection itself is cheap when you do it right.
The Research It's Based On
"Delving into ChatGPT usage in academic writing through excess vocabulary" — identified 21+ words that spiked 3–28× in frequency after ChatGPT's launch. Our vocabulary signal is built directly on this dataset.
Pioneered the use of perplexity and burstiness as AI text signals. Our sentence burstiness algorithm implements the core burstiness coefficient concept from this work.
Research on AI writing patterns in academic contexts informed our understanding of how academic AI differs from narrative AI — leading to the dual-mode detection system.
Wikipedia's large-scale identification and removal of AI-generated content provided a real-world labeled dataset that validated our signal thresholds.
What This Tool Doesn't Do
- It's not a language model — it runs linguistic pattern matching, not neural inference
- It doesn't store or transmit your text — everything runs in your browser
- It isn't 100% accurate — browser-based detectors achieve ~70–90% on unedited AI text
- It should not be used as sole evidence of AI use — false positives exist
- It doesn't check plagiarism — that's a separate problem requiring a different tool
- It doesn't generate reports or PDFs — it gives you a score and signal breakdown
Who Made This
AI Detector Free is a project by getinfotoyou.com — a small web tools site focused on building useful, free, no-nonsense utilities.
For questions, feedback, or to report an issue, contact us through getinfotoyou.com.