What is Know Nota?

Know Nota (Nota) is a web-based AI detector that analyzes your writing and estimates how AI-like it appears. It compares patterns in your text against examples of human and AI writing using a document-level classifier, then returns a machine-likeness score with a plain-English explanation and its limits. Beyond the basic check, it offers matching web sources, saved and shareable reports, a writing history report, a browser extension for Google Docs, and a developer API.

How to use Know Nota?

1. Paste your writing or upload a file (PDF, DOCX, TXT, Markdown, CSV, RTF up to 30 MB); you need at least 50 words. 2. Click 'Check for AI' to run the check. 3. Read your result: a plain-English AI-likeness score and band (low, moderate, elevated, high), plus details on coverage and model limits. 4. On paid plans, find matching web sources, save, download, or share a report, and run batch checks or use the API.

Core features of Know Nota

AI-likeness check with a plain-English score and band (low, moderate, elevated, high)
File uploads: PDF, DOCX, TXT, Markdown, CSV, RTF up to 30 MB
Matching sources: see passages that match pages on the web (paid, beta)
Saved reports: download or share an AI-check report (paid)
Writing history report to add context to your document history
Browser extension to use Nota in Google Docs
Developer API with Bearer keys and batch checks up to 100 files (Professional)
Free tier: up to 2,000 words a day, no card needed