Decision Support · 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 overallFor most everyday users, Sherlock AI Detector wins because its free tier is genuinely useful for scanning web pages and documents, and its sentence-level heatmap is easier to read. AI Detector by 15Tools is faster and supports more file types, but its strict word limits and lack of a mobile app make it less practical for casual use. The single biggest difference is that Sherlock lets you scan URLs directly, while 15Tools requires you to paste or upload text.
AI Detector by 15Tools
Sherlock AI Detector
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Key differences
Facts side by side
| AI Detector by 15Tools | Sherlock AI Detector | |
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| Free plan | ||
| Mobile app | ||
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Common questions
Neither has a dedicated mobile app. You can use both through a phone browser, but the experience is clunky — especially for uploading documents. If mobile use is critical, look for a tool with a native app.
Sherlock is better because it lets you paste a URL (if your essay is online) and includes plagiarism checking. 15Tools is faster but has stricter word limits on the free version, which can be frustrating for longer essays.
Yes, 15Tools explicitly supports GPT-4o and Claude 3.5, so it's more likely to catch content from those models. Sherlock doesn't specify which models it detects, so 15Tools has an edge here.
No — both have generous free tiers. Sherlock's free tier is more practical for everyday use because it allows URL scanning and larger uploads without hitting a paywall quickly. 15Tools' free version has word limits that may push you to upgrade sooner.
Both are easy: paste text or upload a file, click a button, get results. Sherlock has a slight edge because its URL scanning and browser extension make it more convenient for checking content you find online.
Neither offers a public API or direct integrations with platforms like WordPress or Google Docs. Both let you export reports (PDF, JSON), but you'll have to manually copy results into your workflow.
Sherlock AI Detector wins for everyday users with its URL scanning and generous free tier, while AI Detector by 15Tools is faster for batch document checks and supports the newest AI models.
If you're a student, blogger, or casual user who wants to quickly check if something was written by AI — especially a webpage — go with Sherlock AI Detector. If you're a content manager who needs to process lots of documents fast and wants detection tuned for the latest models, AI Detector by 15Tools is your pick. Both are free to start, so try them both and see which feels better for your daily routine.
Detail pages: AI Detector by 15Tools · Sherlock AI Detector
