Selecting a UI element is a fundamental operation on webpages, and the ease of tapping a target object has a significant impact on usability. It is thus important to analyze existing UIs in order to design better ones. However, tools proposed in previous studies cannot identify whether an element is tappable on modern webpages. In this study, we developed Tappy that can identify tappable UI elements on webpages and estimate the tap-success rate based on the element size. Our interviews of professional designers and engineers showed that Tappy helped discussions of UI design on the basis of its quantitative metric. Furthermore, we have launched this tool to be freely available to external users, so readers can access Tappy by visiting the website (https://tappy.yahoo.co.jp).

翻译：选择UI元素是网页上的基本操作，而点击目标对象的难易程度对可用性具有重要影响。因此，分析现有用户界面以设计更优的界面至关重要。然而，以往研究中提出的工具无法识别现代网页上元素是否可点击。在本研究中，我们开发了Tappy，它能够识别网页上的可点击UI元素，并基于元素大小估算点击成功率。我们对专业设计师和工程师的访谈表明，Tappy凭借其量化指标促进了UI设计的讨论。此外，我们已将该工具免费向外部用户开放，读者可通过访问网站（https://tappy.yahoo.co.jp）使用Tappy。