Multi-Engine AI Detection

Free AI Detector — Real GPTZero Analysis, No Sign-Up

Check your text for AI content for free. Real detection engine, not a simulation.

Verified by 211-Sample Benchmark·94.2% Accuracy · 2.5% FPR · 96.1% TPR·See methodology →

Free scan: GPTZero analyzes your first ~300 characters

0 / 10,000

|||.pdf, .docx, .txt

Writer:Text Type:

0-30: Likely Human31-70: Uncertain71-100: Likely AI

Your text is never stored. Only a SHA-256 hash for caching.

Why Multi-Engine Detection?

Single AI detectors disagree on 15-30% of texts. OmniDetect combines three independent engines for consensus — dramatically reducing false positives.

3 Independent Engines

GPTZero, Winston AI, and Originality.ai each analyze your text independently.

Consensus-Based Scoring

When all three engines agree, you can trust the result.

Privacy First

Your text is never stored. Only a SHA-256 hash for caching. GDPR compliant.

Best Free AI Detectors Compared

Not all free AI detectors are created equal. Many use outdated models or limit results behind paywalls. Here's how the top free options stack up in 2026.

OmniDetect offers free GPTZero-powered scans with real sentence-level highlighting — no sign-up required. ZeroGPT provides unlimited free scans but with significantly lower accuracy (our benchmark shows 15-20% higher false positive rates). GPTZero's own free tier limits you to 5,000 characters with a single engine.

The key difference: OmniDetect's free scan uses the exact same commercial GPTZero API that universities pay for. When you're ready for full certainty, upgrade to unlock all three engines on your complete text.

Frequently Asked Questions

Is this AI detector really free?

Yes. You get 3 free scans per day using real GPTZero analysis on your first ~300 characters. No credit card or sign-up required for the free preview.

What's the difference between free and paid?

Free scans use one engine (GPTZero) on the first ~300 characters. Paid plans unlock all three engines (GPTZero + Winston AI + Originality.ai) for full-text analysis up to 50,000 characters.

Do free AI detectors actually work?

Many free detectors use low-quality models. OmniDetect's free tier uses the real GPTZero API — the same commercial engine used by universities worldwide.

Stop guessing. Start knowing.

Paste your text above and get multi-engine consensus in seconds.

Try Free Scan