In a guest post by Simon Grimm, an Ionic Developer Expert, the tutorial guides readers through creating a custom app router for Capacitor apps using VanillaJS, showcasing how to implement routing without relying on frameworks like Angular, React, or Vue. The tutorial covers the initial setup of a Capacitor app using command-line tools, the integration of TailwindCSS for styling, and the use of the lightweight Navigo library for managing routes. It further explains how to create a simple tab bar, handle dynamic URLs with features like active tab highlighting, and implement a custom navigation bar using web components. Additionally, the guide introduces the concept of deeplinks in mobile apps, allowing specific pages to be opened directly via links, and details the process of configuring native platforms for iOS and Android to support these links. The tutorial emphasizes the ease of developing native-like apps with web technologies using Capacitor, highlighting its capability to streamline the building of native iOS and Android apps from web projects.