iOS SDK directory
Swift is a powerful and intuitive programming language for macOS, iOS, watchOS and tvOS. Writing Swift code is interactive and fun, the syntax is concise yet expressive, and Swift includes modern features developers love. Swift code is safe by design, yet also produces software that runs lightning-fast.
Firebase Database let's you sync and store data in realtime. Firebase realtime database is a cloud-hosted NoSQL database that lets you store and sync data between your users in realtime. A product of google, it is constantly being maintained and is a great option when carrying out backend developement.