It's a desktop tool similarly to Affinity. What I like the most is the sidebar. You can actually see all your details, CSS etc. This is so handy for designers. It's very easy to use. It took me only 30 min to get familiar with it..... The only limitation to me is rendering. Takes a bit longer than I thought but other than that very happy with....I'm passing it to our designers and see how we go. CSS feature is really damn good so you can customize your file the way you normally do if you are a designer....Quick and fast...