Accurate AI Detector.
Check AI Text for Authentic Content
Verify originality with high accuracy. Check up to 2,000 words with 3 free scans every day.
Upload .docx or .txt
A LITTLE CLARITY GOES A LONG WAY
Likely AI or Original
15% AI Allowance Selected
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AI detection is probabilistic, not proof of authorship. Review scores alongside writing history. Confidence is shown only when the detector supplies it.
Accurate on leading LLMs: , , , , and more.
AI Detection Tool
GramProof analyzes text using state-of-the-art linguistic and neural pattern detection to identify whether content was generated by AI models like ChatGPT, Claude, and Gemini or crafted by a human writer.
Our system scans for subtle markers of machine generation—such as low perplexity, repetitive syntactic structures, and artificial cadence—giving educators, writers, and publishers full clarity on content provenance.

Get a writing assistant wherever you go
Bring GramProof’s AI detector directly into your daily workflow. Scan essays, articles, and emails across Google Docs, Gmail, and browser tabs with one click.
Why use GramProof's AI detector?
Modern detection features built for precision, clarity, and peace of mind.
Human: The field experiment examined local soil salinity trends across 15 agricultural test sites.
AI-assisted: It is crucial to acknowledge that comprehensive ecological models play an essential role.
Sentence-level probabilistic breakdown
Avoid guesswork. Instead of a blanket percentage, GramProof highlights every sentence based on burstiness, perplexity, and linguistic variation.
Find the best synonym using an AI-powered thesaurus.
Click on any word or sentence to see suggested synonyms and choose the perfect fit for your message.

Suggest synonyms for: original
How does GramProof work?
Get comprehensive authenticity insights in three straightforward steps.
Enter or paste your text
Paste sentences or entire documents. Add at least 100 words for full contextual analysis.
Calibrate AI Allowance
Select your tolerance threshold to match your school or organization’s guidelines.
Review instant metrics
Explore sentence-by-sentence probabilities, confidence scores, and deep scan insights.

A little more clarity