Scribbr vs. ThesisScan: Which AI Detector Is Better for Your Thesis?

If you're looking for an AI detector for your thesis or essay, you'll likely come across two names: Scribbr and ThesisScan. Both make similar promises. Here's what actually sets them apart.

Why this comparison matters

Most students already know Scribbr. The Dutch company has been a go-to for proofreading and plagiarism checking for years, and has added AI detection to its toolkit more recently. ThesisScan is newer, more focused, and built from the start for one specific purpose: analysing academic papers chapter by chapter for AI patterns.

Whether that makes a practical difference, and when each tool is the better choice, is what this article looks at. Including the parts where ThesisScan comes up short.

Quick overview: What can each tool do?

Scribbr in detail

Scribbr has been around for years and is well established among students in Germany, Austria and the Netherlands. The company started as a proofreading platform and has since added plagiarism checking, citation formatting and AI detection to its offer.

Where Scribbr does well

If you want your paper proofread, checked for plagiarism and scanned for AI content all in one place, Scribbr handles that. For students who are already booking a proofreading service, it is a practical combination. The interface works well and the support is reliable.

Where Scribbr has limitations

The AI detection gives you an overall percentage. You learn that your paper is 34 percent AI-generated. What you don't learn is which chapter caused that number, and what you should actually do about it. For most students, that is the more useful question.

Scribbr is also primarily optimised for English. German academic texts work, but the accuracy for German phrasing conventions, citation styles and academic register is lower than a tool built specifically for that context.

ThesisScan in detail

ThesisScan does one thing: analyse academic papers chapter by chapter and tell you what sounds AI-generated and what to do about it. No proofreading service, no plagiarism check, no subscription.

Where ThesisScan does better

Instead of a single percentage, you get a breakdown by chapter. Each one scored individually. For the chapters that stand out most, you get specific guidance: which sentence is flagged, why it reads as AI-typical, and what a more natural version might look like. That is the difference between a result you can actually use and one you file away without acting on it.

The full report can be downloaded as a PDF, which is useful if you want to go through the analysis with your supervisor or just keep a record.

For German academic texts, ThesisScan is calibrated for the patterns that tend to appear in German-language academic writing. That makes a noticeable difference for technical vocabulary, citation conventions and sentence structure.

Where ThesisScan has limitations

There is no plagiarism check. If you need both AI detection and plagiarism screening, you will need a second tool. Scribbr has a real advantage here for students who want everything in one place. ThesisScan is also younger and smaller. Support responds quickly, but Scribbr simply has more capacity as an established company.

Why the difference matters more than it sounds

Imagine your bachelor's thesis has seven chapters. You wrote six of them yourself. In Chapter 4, the theoretical framework, you leaned heavily on AI and barely revised it.

A tool that gives you one overall score says: 32 percent AI content. That sounds manageable. But Chapter 4 scores 78 percent. And that is exactly the chapter your professor will notice.

ThesisScan shows you that. Scribbr does not. That sounds like a small technical difference. In practice it is not.

When does each tool make sense?

Scribbr makes sense if you are already booking a proofreading service or need a plagiarism check at the same time. The overall package is solid and saves you coordinating between different providers.

ThesisScan makes sense if you want to know specifically which chapter is flagged and what to do there. Or if you want to check once before submission without taking out a subscription. And if your paper is in German, that plays a role too.

What does it actually cost?

Scribbr's AI detection is part of a subscription. Students who only want one check still pay for the whole month. ThesisScan charges a one-time fee by page count: 9.99 euros up to 50 pages, 19.99 euros up to 100 pages, 34.99 euros up to 250 pages.

For a single submission, the one-time model is almost always cheaper. A subscription only starts making sense if you are checking multiple papers regularly over several months.

Conclusion

If you already use Scribbr for proofreading or plagiarism checking, there is no reason to switch. The offering is solid and the AI tool does its job.

If you want to understand exactly where your paper sounds suspicious and get concrete guidance on what to revise, ThesisScan gives you deeper results. For a one-time payment with no subscription.

Neither tool is a guarantee. No AI detector is perfect, and neither replaces your own judgement. But as a second opinion just before submission, both are considerably better than nothing.