Wow, Im surprised no one has reviewed this yet! Chefsteps is a truly remarkable website with detailed step-by-step instructions for professional recipes using modernist techniques (i.e. Sous-vide, gellification, etc)
The app is very good, the only issue which had me debating whether to give it 4 stars instead of 5 is that the website has user comments, and the chef/mod answers to those questions/comments which are often very helpful. If those were somehow integrated into the app it would take this app to the next level. I ended up giving it 5 stars anyway because Chefsteps deserves it, the content is there and compared to other apps out there this is far superior.