WAF (Web Application Firewall) has been the first line of defence when it comes to application security for a while now. AppTrana does not give default rules and ask the customer to manage them, instead it starts with understanding the risk profile of application through its detection module which scans the application for vulnerabilities. Based on the detection, rules are written and tweaked to meet the application need ensuring there are no FPs with very little FNs. The team of experts continuously monitors the security space and keep the rules updated, ensuring all zero-day vulnerabilities are immediately protected.
Source: https://thehackernews.com/2019/08/apptrana-waf-vulnerability-scanner.html