YssCompare is inspired by TankPoints. The goal is to have one addon that can be used for any Class/Spec. All you have to do is add the StatWeights in the Options and add the default gems you want assigned for each slot and it will then calculate an Items worth for you. The Item Value is found on the bottom of your Items Tooltip.
But adding values to tooltips is only the beginning. The big feature is the LDB plugin which shows you your total gear score and when you click it will give you an overview of all your equipped items and all items in your bag and bank (you have to visit your bank at least once) (the values on the bag/bank items are the difference between it an the equipped item.
Since some trinkets and a few items rely on procs/onuse you can right-click the item (on the LDB tooltip) and configure the proc which is then calculated into the Items Point Value.
You can also blacklist items from the LDB tooltip either via exact itemlink or by itemid. If you blacklist by exact link it will reappear if you enchant/gem it differently since its exact link will have changed. (blacklisting is also done via right-clicking)
Also you may equip items directly from the LDB tooltip via the right-click menu.
(Modified left clicks work like you would expect from items)
The addon does not come with any preset Stat Weights since they can change with any patch :P