wtf is rcurrency?

RCurrency is a small iOS app that shows currency exchange rates and keeps them available even when your phone loses its internet connection. The core idea is simple: fetch data from a web service once, store it locally, and then serve that cached version whenever the network is unavailable. At a technical level, the app uses a tool called Realm to handle the local storage. Realm acts as a lightweight database that lives on the device itself. When the app fetches fresh exchange rates from an online API, it saves a copy into Realm. If the user later opens the app without a connection, the app reads from that local Realm database instead of trying to reach the internet, displaying the most recent rates it successfully retrieved. The project is aimed squarely at mobile developers rather than end users. If you are a developer building an app that needs to work reliably in airplanes, subways, or areas with spotty coverage, this serves as a practical template. A weather app, a news reader, or a portfolio tracker could all use the same pattern to ensure users see data instead of an error screen when they go offline. It is a reference implementation rather than a product meant for the App Store. The README is sparse on implementation details, but it links to a tutorial that walks through the full build process. The project is written in Swift and has a small footprint, making it easy to download and examine directly. By focusing on a single, clear use case, caching API results, it demonstrates a specific tradeoff: the data shown offline might be slightly stale, but the user experience remains smooth and uninterrupted.