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Antoine Vastel is joining Castle as Head of Research
Bot detection is broken. Attackers have moved far beyond basic bot scripts—they’re leveraging AI, residential proxies, and sophisticated
The Castle blog
Research and insights on stopping modern bots and fraud
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Bot detection 101: How to detect bots In 2025?
The good old days where bots used PhantomJS and could be detected because they didn’t support basic JavaScript features
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How to detect Headless Chrome bots instrumented with Playwright?
Headless Chrome bots powered by Playwright have become a go-to tool for bot developers due to their flexibility and efficiency.
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How to detect Headless Chrome bots instrumented with Puppeteer?
Headless Chrome bots powered by Puppeteer are a popular choice among bot developers. The Puppeteer API’s ease of use,
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Anti-detect browser analysis: How to detect the Undetectable browser?
This is the second article of our series about anti-detect browsers. In the first article, we gave an overview of
Research
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Overview of anti-detect browsers
This is the first article of a series about anti-detect browsers. In this article, we provide an overview of anti-detect
Antoine Vastel is joining Castle as Head of Research
Bot detection is broken. Attackers have moved far beyond basic bot scripts—they’re leveraging AI, residential proxies, and sophisticated
Research
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Detecting noise in canvas fingerprinting
In a previous blog post, we talked about canvas fingerprinting, a technique commonly used to detect fraudsters and bots. In
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The role of WebGL renderer in browser fingerprinting
Browser fingerprinting leverages different JavaScript attributes related to the user's device, OS, and browser. When it comes to
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Anatomy of a 4-day mobile app credential stuffing attack
In this article, we cover the details of a distributed credential-stuffing attack that targeted the mobile application of a major
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How bots and fraudsters exploit free tiers in AI SaaS
The latest wave of artificial intelligence (AI) improvements significantly improved the quality of models for image and text generation. Several
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How bots and fraudsters exploit video games with credential stuffing
If you spend time on video game forums, you might have noticed posts from users discussing their accounts being hacked
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Open Bullet 2: The preferred credential stuffing tool for bots
Open Bullet 2 is an open-source software, specialized in credential stuffing attacks, i.e. attacks that use bots to automatically