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AI Detector by SEOToolZone
Best overallFor most everyday users, AI Detector by SEOToolZone wins on sheer simplicity and zero cost, making it ideal for quick checks of short texts. AI Detector by 5Tools offers deeper analysis with file uploads and a heatmap, but its unclear pricing and complex setup make it better suited for serious content reviewers. The single biggest difference: 5Tools gives you a sentence-level heatmap and supports PDFs, while SEOToolZone is free, fast, and works for basic copy-paste needs.
AI Detector by 5Tools
AI Detector by SEOToolZone
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Key differences
Facts side by side
| AI Detector by 5Tools | AI Detector by SEOToolZone | |
|---|---|---|
| Free plan | ||
| Mobile app | ||
| API access |
Common questions
AI Detector by 5Tools is better because it accepts PDF and DOCX uploads, has no word limit, and shows a sentence-level heatmap so you can see exactly which parts look AI-written.
Yes, it is completely free. You don't need to register or pay anything. The trade-off is that you'll see ads on the page, and you're limited to 2000 words per scan.
Neither tool has a mobile app, but both websites work in a mobile browser. SEOToolZone is easier to use on a phone because you just paste text and tap a button.
5Tools is likely more accurate for tricky cases because it has a 'Deep Scan' that detects humanized AI text and analyzes semantic variance. SEOToolZone is fine for obvious AI text but may miss sophisticated rewrites.
Yes, for basic scans you can use it without registration, but for the full features (Deep Scan, certificate, file uploads) you need to authenticate via OAuth2 or create a service account.
No. Neither tool supports batch processing. With 5Tools you can upload one file at a time; with SEOToolZone you have to copy-paste each text separately.
SEOToolZone wins for quick, free checks; 5Tools wins for deep document analysis — pick based on whether you value simplicity or depth.
If you just need a quick, free check on a short piece of text — like a blog post or an email — go with AI Detector by SEOToolZone. It's dead simple and costs nothing. But if you regularly work with long documents, need to see exactly which sentences are flagged, or require a proof of authenticity, AI Detector by 5Tools is worth the extra setup effort — just be prepared for unclear pricing and a steeper learning curve.
Detail pages: AI Detector by 5Tools · AI Detector by SEOToolZone
