A Web App Security Assessment focuses on vulnerabilities in web-based applications accessed via browsers, such as online portals, e-commerce platforms, or SaaS applications. Thick Client Application Security Assessment, on the other hand, targets applications that run locally on a user’s device but may still interact with a server, like desktop software. Both assessments aim to identify security gaps, but the techniques and tools used vary depending on the application’s architecture, with thick client apps requiring deeper client-side scrutiny and system integration checks.