![Knack](https://ph-files.imgix.net/cf4557e1-ab1e-4ef8-9552-b0210a1b28fe.png?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=64&h=64&fit=crop&frame=1)
I love this product. It markets itself as online database software, and surely could be used for that, but in my case I find it incredibly useful as a prototyping platform. If you have a web app concept that needs quick validation and are finding mockups and wireframes insufficient, Knack could be a huge timesaver, and a lot easier to setup and run with compared to getting the same functionality (without styling) out of Adobe products, Moqups or Sketch. A wysiwig for MVC-based web apps.