ShaderScope

The sketch pad for Metal shaders

ShaderScope lets you experiment with shaders in real time while seeing every phase of your render pipeline. Every intermediate pipeline state, off-screen render, and color attachment can be updated instantly, their cameras moved independently, and your shader code, parameters, and values tweaked constantly, all with no build/deploy step. Just click the Recompile button and keep on experimenting.

To see how ShaderScope works, have a look at this overview video.