Mobile web browsers offer some exciting capabilities for our web applications, especially for map applications! But they offer some challenges too. We've seen in Chapter 2, Key Concepts in OpenLayers, that web developers have powerful tools like Chrome Developer Tools at their disposal for debugging web applications. But it's not that easy on mobile devices, where these tools don't exist. Fortunately, there is an answer! In this section, we'll cover techniques for debugging web applications on each of iOS and Android, as well as another tool that isn't device-specific.