...Animations that look great on your laptop often feel too slow when in-hand. Layouts that looks perfect on a 27-inch display might be too cramped on a 4-inch device. Light gray text may look subtle in Sketch, but it’s downright illegible when you’re outside on a sunny day. These animation timings, font sizes, and color choices are all examples of “magic numbers” - the constants that give your app its usability and identity. The goal of SwiftTweaks: allow you to fine-tune these magic numbers in the debug builds of your Swift project, without having to wait for Xcode to rebuild the app.