# Tech Stack ### **React Native with JavaScript** Used to build our application's user interface. We chose React Native as it seemed to have a good community with lots of packages available to us. ### **Expo, Expo Go** Expo is a developer tool for creating experiences with interactive gestures and graphics using JavaScript and React. We chose Expo as it allows us to run our code on both Android and iOS platforms easily. ### Firebase We used Firebase for our backend database, which is used to store and handle user authentications and other data in our app. **Google Cloud: Google Directions** Used to generate routes for the auto-routing feature. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://run-mania.gitbook.io/run-mania/tech-stack-and-system-design/tech-stack.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.