Sherlock lets you edit views and layout constraints in real time, simulate running on other devices, and jump straight to the source code, all from your iOS Simulator - zero configuration required.
I mostly finish up design changes on a real device, instead of the Simulator, but I cannot do that using Sherlock :(
Incredible tool allowing us to change the design (including constraints & custom IBInspectables!!!) without rebuilding. Literally amazing!Linus G. has used this product for one month.