Castle (YC W16) Analyzes User Data to Stop Hackers
blog.ycombinator.com
blog.ycombinator.com
We have lots of plans for improving the product: more 3rd-party integrations, built-in 2FA/captcha, APIs to build your own "security page" with device and session history. Would love to hear the feedback from the HN community!
The risk of FPs and the lack of clear benefit to the company paying you you seems like a hard place to make money.
Seems equally easy to circumvent, if you are a malicious user. Just block the analytics from loading.