Past research has shown that static-analysis tools suffer from common usability issues such as a high rate of false positives, lack of responsiveness, and unclear warning descriptions and classifications. To address the usability issues of static-analysis tools, Lisa Nguyen Quang Do et al.20 proposed a user-centered approach to designing these tools during the development of the analysis, as opposed to keeping the development of the analysis and its user interface (UI) separate. To this end, they defined 10 guidelines for designing the UI of an analysis tool. The authors extracted those guidelines from existing literature and a study that they have conducted across 17 static-analysis tools and 87 software developers at Software AG. The guidelines consider analysis engine requirements, user behavior, reporting platforms, and the effects of company policies on the usage and adoption of static-analysis tools.18 This article explores the effect of applying this user-centered approach and the design guidelines to SWAN,26 a security-focused static-analysis tool for the Swift programming language. SWAN is being actively developed to feature better integration into the Swift development workflow, a faster and more precise analysis engine, and a new UI. Our goal is to evaluate the effectiveness of the approach and guidelines for improving the usability of the next version of SWAN. SWAN is being created to address the lack of openly available static-analysis tools for Swift.