Cap secure is a captcha vulnerability analysis tool made using deep learning. It helps to test vulnerabilty of your captcha using a custom based CNN architecture named CapNet. Paper's link : https://www.semanticscholar.org/paper/Vulnerability-analysis-of-captcha-using-Deep-Walia-Odugoudar/e40d4e93c464c1d8cc3de8fc0f61e906856ac919#citedPapers
Paper presented in the 43rd World Conference on Applied Science, Engineering and Technology.