The user interface of this software is very easy to use,it also has many customization options which makes it more flexible than others. It's free version comes with limited features but one can upgrade to premium versions without any cost. If you are looking for best API testing tool then definitely go for this product because all your requirements will be met by this software. At present I am working in an offshore oil & gas E&P Company as an project manager. We have used finsemble to create our own customised applications.