Sites and apps similar to NoxScan include HostedScan Security, which has a free version. Other options are Pentest-Tools.com and Intruder. In total there are three Vulnerability Scanners like NoxScan.
HostedScan provides 24x7 alerts and detection for security vulnerabilities. Industry-standard, open-source, vulnerability scans. Automated alerts when something changes. Manage target list manually or import automatically from providers, such as AWS, DigitalOcean, and Linode...
United States
We facilitate quick discovery and reporting of vulnerabilities in websites and network infrastructures, providing a set of powerful and tightly integrated pentesting tools that enable you to perform easier, faster, and more effective pentests.
Romania
EU
Intruder is a security monitoring platform for internet-facing systems.
Intruder provides an easy to use security solution which continually scans your digital assets, highlighting vulnerabilities and outlining remediation advice in simple terms.
United Kingdom