Decision Support · Side-by-side

Sherlock AI Detector vs AI Detector by SEOToolBox. Side by side.

Compare pricing, strengths, and use cases so it is easier to pick the right fit.

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Sherlock AI Detector

Best overall

AI Detector by SEOToolBox

For most everyday users, Sherlock AI Detector wins because its generous free tier and simple document uploads make it easy to check text without paying. The biggest difference is price: Sherlock offers a real free tier, while SEOToolBox locks its best features behind a $59/month subscription. Choose Sherlock for casual or occasional use; choose SEOToolBox only if you need high accuracy on technical or ESL content and have the budget.

Sherlock AI Detector

Free Tier Available #1307 of 3,826 Web

AI Detector by SEOToolBox

$59/mo - $149/mo #2939 of 3,826 Web

Scores at a glance

Sherlock AI DetectorAI Detector by SEOToolBoxPractical Versatility

Onboarding Ease

Ecosystem Fit

Market Value

Choose Sherlock AI Detector if

You're a student who needs to check essays and papers a few times a month
You run a small blog and want to verify your writers aren't overusing AI
You need to upload large PDF reports for quick AI-probability scanning
You want a free tool that works well for casual or moderate use

Choose AI Detector by SEOToolBox if

You're a professional editor or content manager who checks dozens of articles daily
You work with non-native English writers and need minimal false positives
You're a developer who wants to integrate AI detection into your own app via API
You already use SEOToolBox for SEO and want an all-in-one workflow

Key differences

Sherlock has a generous free tier; SEOToolBox's free tier is nearly unusable
SEOToolBox is more accurate on technical and ESL content; Sherlock can flag normal technical writing as AI
Sherlock supports PDF and DOCX uploads; SEOToolBox mainly handles text and URLs
SEOToolBox includes SEO compliance scanning; Sherlock focuses purely on AI detection
Neither tool has a mobile app, so both require a desktop or tablet browser
Sherlock is better for occasional users; SEOToolBox is built for heavy, professional use

Facts side by side

	Sherlock AI Detector	AI Detector by SEOToolBox
Free plan
Mobile app
API access

Sherlock AI Detector: strengths & weaknesses

Generous free tier lets you check many documents without paying
Supports large document uploads (PDF, DOCX) so you can scan whole reports
Fast processing gives results in seconds
Sentence-level heatmap makes it easy to see which parts look AI-written
No mobile app — you need a computer or tablet browser
Occasional false positives on technical or scientific writing
Advanced features like API and bulk scanning require a paid plan
No API for developers to integrate into other tools

AI Detector by SEOToolBox: strengths & weaknesses

Very accurate on technical content and ESL writing — fewer false alarms
Granular sentence-by-sentence heatmap with color coding
Robust API available for developers who want to automate checks
Includes SEO compliance checking alongside AI detection
Free tier is extremely limited — you'll likely need the $59/month plan
Interface is cluttered with other SEO tools, which can be confusing
Occasionally misidentifies highly structured legal text
No mobile app and no direct integrations with common writing tools

Common questions

Is Sherlock AI Detector better than AI Detector by SEOToolBox for checking student essays?

Yes, Sherlock is better for students because its free tier handles large uploads and gives clear sentence-level heatmaps without costing anything. SEOToolBox's free tier is too limited for regular essay checking.

Can I use either tool on my phone?

No, neither tool has a mobile app. You can use their websites on a phone browser, but the interfaces are not optimized for small screens and document uploads are clunky on mobile.

Which tool is more accurate for detecting AI-written content?

SEOToolBox is slightly more accurate, especially on technical or ESL writing, because it produces fewer false positives. Sherlock is still very good but may flag normal technical language as AI-generated.

Do I need to pay to use AI Detector by SEOToolBox?

Almost certainly yes. The free tier is very limited (a few checks per month), and the paid plans start at $59/month. Sherlock's free tier is much more generous and may be enough for most people.

Can I integrate either tool with Google Docs or WordPress?

Neither tool offers direct integrations with Google Docs or WordPress. Sherlock has a browser extension for Chrome/Edge, and SEOToolBox has an API for custom integrations, but there's no one-click plugin.

Sherlock AI Detector is the better choice for most people thanks to its free tier and simplicity, while SEOToolBox is the accuracy king for professionals who can afford the subscription.

If you're a regular person who just wants to check if something sounds like AI every now and then, start with Sherlock AI Detector — it's free, fast, and easy. Only upgrade to SEOToolBox if you need top-tier accuracy for professional work and don't mind paying $59/month. Both tools work on desktop browsers, so keep a laptop or tablet handy.

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Sherlock AI Detector

AI Detector by SEOToolBox

Free plan

Mobile app

API access