While you may be able to free vulnerability scanning tools online, relying on these services could put you at risk. Free services may not offer up-to-date databases or cover only some of the popular apps in use today. In the worst case scenario, free vulnerability scanning tools may just be malware in disguise (similar to a fake antivirus) that will infect your device instead of shoring up your defenses.
For your safety, we recommend using security tools, including vulnerability scanners, from trusted and reliable services like NordVPN.